Ms. Demaree Collier Superfund Division 77 West Jackson ... · 400 mg/kg: 25 mg/kg: $0 (trols 400...

23 August 2013

Ms. Demaree Collier Remedial Project Manager U.S. Environmental Protection Agency Superfund Division 77 West Jackson Boulevard, SR-6J Chicago, Illinois 60604

Subject: Analysis of Potential Lead Remedial Action Levels (RAL) for Soil in the Residential (RES) Area Matthiessen and Hegeler Zinc Company Site, LaSalle County, Illinois Remedial Action Contract (RAC) 2, EP-S5-06-02 Work Assignment No. 132-RICO-B568

Dear Ms. Collier:

As discussed during a conference call on July 16, 2013, between Demaree Collier, U.S. Environmental

Protection Agency (EPA) Work Assignment Manager (WAM), Jennifer Knoepfle, SulTRAC Project

Manager (PM), and Kara Nierenberg, SulTRAC Interim PM, there is a high probability that EPA and/or

Illinois EPA will decrease the lead Remedial Action Level (RAL) value for the Matthiessen and Hegeler

Zinc Company Site (Site) Final Feasibility Study (FS). The Draft FS used a lead RAL of 400 milligrams

per kilogram (mg/kg), which is the EPA Residential Soil Remedial Screening Level (RSL). The federal

and state regulatory lead cleanup levels may be decreased due to a decrease in the allowable blood lead

concentrations in exposed populations. In preparation for a reduction of the lead RAL, EPA tasked

SulTRAC with re-calculating the FS cost estimates for the Residential (RES) Area under the assumption

that the lead RAL may be reduced from 400 mg/kg to a value between 225 and 375 mg/kg. Therefore,

using the Draft FS as a template, SulTRAC has recalculated the RES Area volume calculations and costs

for the following potential lead values: 225, 250, 275, 300, 325, 350, 375, and 400 mg/kg. With the

exception of the lead value, all other assumptions used in the calculation of the soil volume to be

addressed and the cost estimates stated in the Draft FS have remained the same.

Using the 1E-05 RALs presented in the Draft FS, and replacing the lead value with each of the potential

lead values (225, 250, 275, 300, 325, 350, 375, and 400 mg/kg), SulTRAC recalculated the number of

properties sampled during the Remedial Investigation (RI) that exceeded the revised RALs. Figures 1

through 8 show the locations where

Ms. Demaree Collier 23 August 2013

One South Wacker Drive, 37th Floor, Chicago, IL 60606 Tel 312.201.7700 Fax 312.938.0118

lead exceeds the selected value (from 225 through 400 mg/kg),

arsenic exceeds the 1E-05 RAL (which is equal to the background threshold value [BTV] of 11.7 mg/kg), and

any other contaminants exceed their respective RALs.

The figures show that both lead and arsenic exceed their respective RALs at the same properties;

specifically, at those properties which are closer to the Site (along the eastern side of the residential area

and in the area referred to as Residential Area, Zone 1 in the Draft FS). The properties to the west, which

are farther from the Site (located in Residential Area Zones 3 and 4), have significantly fewer locations

where both lead and arsenic exceed the RALs.

After reviewing the change in the extent of properties that would exceed each of the potential lead values,

SulTRAC recalculated the volume of soil material that would be addressed by each of the FS alternatives

for each of the potential lead levels. Appendix A (Tables RES-1 through RES-7) shows the number of

properties in each zone, the number of properties sampled, the number of properties that exceed the

specific lead value and 1E-05 RALs, and the frequency (or percent) of the properties in each zone that

will exceed the RALs when extrapolated to the entire zone. Appendix A is a series of revised tables using

the potential lead values and RALs that were included in the Draft FS as Appendix S-1. The method used

in calculating the RES Area soil volumes to be addressed by the alternatives was discussed in Section

2.4.2.1 of the Draft FS and is included as Attachment 1 to this letter. The potential lead values of

300 mg/kg and 325 mg/kg have the same number of properties that exceed the RALs; therefore, these two

values have been combined in a single appendix table (Appendix A, Table RES-4). Further, each table in

Tables RES-1 through RES-7 includes the calculations for the amount of soil and cover material that will

be addressed by FS RES Area Alternatives 2, 3, and 4 for the OU2 Residential Area.

Note that, in the process of reviewing the RI data, SulTRAC found an error in the number of properties

sampled. The Final RI and the Draft FS stated that 194 residential properties were sampled; however, a

further review of the data found that 189 distinct, separate properties were sampled during the RI. As

such, the percent of properties that exceed the RALs using a lead value of 400 mg/kg slightly changed

between the Draft FS and this letter.

The revised soil and cover material volumes were input into the Draft FS cost-estimate templates to

calculate the change in the RES Area alternative costs. Table 1 shows the total costs for RES Area

Alternatives 1 through 4 for each of the potential lead values and the potential cost increase of decreasing

the lead RAL from 400 mg/kg to a lesser concentration. Tables 2 through 5 show detailed costs for RES

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Ms. Demaree Collier 23 August 2013

One South Wacker Drive, 37th Floor, Chicago, IL 60606 Tel 312.201.7700 Fax 312.938.0118

Ms. Kara Nierenberg, P.E. SulTRAC Interim Project Manager

cc: Mr. Ray Mastrolonardo, SulTRAC File Enclosures: Figure 1. OU2 Residential Area Soil Results – Lead > 225 mg/kg Figure 2. OU2 Residential Area Soil Results – Lead > 250 mg/kg Figure 3. OU2 Residential Area Soil Results – Lead > 275 mg/kg Figure 4. OU2 Residential Area Soil Results – Lead > 300 mg/kg Figure 5. OU2 Residential Area Soil Results – Lead > 325 mg/kg Figure 6. OU2 Residential Area Soil Results – Lead > 350 mg/kg Figure 7. OU2 Residential Area Soil Results – Lead > 375 mg/kg Figure 8. OU2 Residential Area Soil Results – Lead > 400 mg/kg Figure 9. Graph of Residential Area FS Costs Table 1. OU2 Soil RES Area Alternatives Cost Comparison – Revised Lead RALs Table 2. OU2 Soil RES Alternative 1 Cost – Revised Lead RALs Table 3. OU2 Soil RES Alternative 2 Cost – Revised Lead RALs Table 4. OU2 Soil RES Alternative 3 Cost – Revised Lead RALs Table 5. OU2 Soil RES Alternative 4 Cost – Revised Lead RALs Appendix A – OU2 Soil Volume Calculations Appendix B – Basis for Cost Estimates Attachment 1 – Excerpt from Draft FS Report (Section 2.4.2.1 – OU2 Soil Volume Calculations)

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MATTHIESSEN AND HEGELER ZINC COMPANY SITEOPERABLE UNIT 2, LASALLE COUNTY, ILLINOIS

GRAPHIC SCALE

0 1,000 2,000

feet

1 inch = 1,050 feet£Arsenic, lead (>225 mg/kg) and other analytes exceed RALs

Lead (>225 mg/kg) and other analytes exceed RALs, except arsenic

Analyzed only for lead & zinc

Residential zone

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Other analytes exceed RALs except arsenic and lead

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No analytes exceed RALs

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OU2 RESIDENTIAL AREA SOIL RESULTS – LEAD >225 MG/KG

EPA REGION 5 RAC 2 | REVISION 0 | AUGUST 2013

FIGURE 1

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Arsenic, lead (>250 mg/kg) and other analytes exceed RALs





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$0

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1 2 3 4 5 6 7 8

Lead Value (mg/kg)

Figure 9. Graph of Residential Area FS Costs

Alternative 1

Alternative 2

Alternative 3

Alternative 4

225 250 275 300 325 350 375 400

TABLE 1OU2 SOIL RES AREA ALTERNATIVES COST COMPARISON - REVISED LEAD RALS

MATTHIESSEN AND HEGELER ZINC COMPANY SITE

OU2 Soil RES Area AlternativesEstimate Category Alt 1: No Action Alt 2: On-site Soil Cover + Institutional Controls

Lead = 2251E-05

Lead = 2501E-05

Lead = 2751E-05

Lead = 3001E-05

Lead = 325 1E-05

Lead = 350 1E-05

Lead = 3751E-05

Lead = 4001E-05

Lead = 2251E-05

Lead = 2501E-05

Lead = 2751E-05

Lead = 3001E-05

Lead = 325 1E-05

Lead = 350 1E-05

Lead = 3751E-05

Lead = 4001E-05

Construction $0 $0 $0 $0 $0 $0 $0 $0 $47,378,000 $47,074,000 $44,789,000 $44,143,000 $44,143,000 $43,969,000 $41,679,000 $41,523,000

Engineering and Construction Mgmt. $0 $0 $0 $0 $0 $0 $0 $0 $15,519,000 $15,416,000 $14,652,000 $14,433,000 $14,433,000 $14,375,000 $13,606,000 $13,555,000

Operations and Maintenance $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000

Subtotal $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $79,308,000 $78,901,000 $75,852,000 $74,987,000 $74,987,000 $74,755,000 $71,696,000 $71,489,000

Contingency (20%) $4,000 $4,000 $4,000 $4,000 $4,000 $4,000 $4,000 $4,000 $15,862,000 $15,780,000 $15,170,000 $14,997,000 $14,997,000 $14,951,000 $14,339,000 $14,298,000

Total $23,000 $23,000 $23,000 $23,000 $23,000 $23,000 $23,000 $23,000 $95,170,000 $94,681,000 $91,022,000 $89,984,000 $89,984,000 $89,706,000 $86,035,000 $85,787,000Cost Difference from

Lead RAL of 400 mg/kg $0 $0 $0 $0 $0 $0 $0 $0 $9,383,000 $8,894,000 $5,235,000 $4,197,000 $4,197,000 $3,919,000 $248,000 $0

Page 1 of 2

Estimate Category

Construction

Engineering and Construction Mgmt.

Operations and Maintenance

Subtotal

Contingency (20%)

TotalCost Difference from

Lead RAL of 400 mg/kg

TABLE 1OU2 SOIL RES AREA ALTERNATIVES COST COMPARISON - REVISED LEAD RALS

MATTHIESSEN AND HEGELER ZINC COMPANY SITE

OU2 Soil RES Area AlternativesAlt 3: Soil Excavation + On-site Consolidation under a Soil Cover Alt 4: Soil Excavation + Off-site Disposal

Lead = 2251E-05

Lead = 2501E-05

Lead = 2751E-05

Lead = 3001E-05

Lead = 325 1E-05

Lead = 350 1E-05

Lead = 3751E-05

Lead = 4001E-05

Lead = 2251E-05

Lead = 2501E-05

Lead = 2751E-05

Lead = 3001E-05

Lead = 325 1E-05

Lead = 350 1E-05

Lead = 3751E-05

Lead = 4001E-05

$60,017,300 $59,641,200 $56,616,500 $55,578,100 $55,578,100 $55,365,600 $52,448,600 $52,172,200 $98,025,000 $97,391,000 $92,266,000 $90,936,000 $90,936,000 $90,580,000 $85,491,000 $85,164,000

$19,321,000 $19,198,000 $18,202,000 $17,886,000 $17,886,000 $17,817,000 $16,848,000 $16,765,000 $28,054,000 $27,872,000 $26,393,000 $26,009,000 $26,009,000 $25,907,000 $24,439,000 $24,345,000

$777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000

$80,115,300 $79,616,200 $75,595,500 $74,241,100 $74,241,100 $73,959,600 $70,073,600 $69,714,200 $126,856,000 $126,040,000 $119,436,000 $117,722,000 $117,722,000 $117,264,000 $110,707,000 $110,286,000

$16,023,000 $15,923,000 $15,119,000 $14,848,000 $14,848,000 $14,792,000 $14,015,000 $13,943,000 $25,371,000 $25,208,000 $23,887,000 $23,544,000 $23,544,000 $23,453,000 $22,141,000 $22,057,000

$96,138,000 $95,539,000 $90,715,000 $89,089,000 $89,089,000 $88,752,000 $84,089,000 $83,657,000 $152,227,000 $151,248,000 $143,323,000 $141,266,000 $141,266,000 $140,717,000 $132,848,000 $132,343,000

$12,481,000 $11,882,000 $7,058,000 $5,432,000 $5,432,000 $5,095,000 $432,000 $0 $19,884,000 $18,905,000 $10,980,000 $8,923,000 $8,923,000 $8,374,000 $505,000 $0

Page 2 of 2

Estimate Category

Risk LevelLead = 225

1E-05Lead = 250

1E-05Lead = 275

1E-05Lead = 300

1E-05Lead = 325

1E-05Lead = 350

1E-05Lead = 375

1E-05Lead = 400

1E-05REMEDY CONSTRUCTION

ENGINEERING & CONSTRUCTION MANAGEMENT $0 $0 $0 $0 $0 $0 $0 $0

OPERATIONS AND MAINTENANCE $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $19,000

Project Subtotal $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $19,000 $19,000

20% Contingency $4,000 $4,000 $4,000 $4,000 $4,000 $4,000 $4,000 $4,000

Project Total $23,000 $23,000 $23,000 $23,000 $23,000 $23,000 $23,000 $23,000

Cost

TABLE 2OU2 SOIL RES ALTERNATIVE 1 COST - REVISED LEAD RALS

NO ACTIONMATTHIESSEN AND HEGELER ZINC COMPANY SITE

Page 1 of 1

Estimate Category


1E-05Lead = 250

1E-05Lead = 275

1E-05Lead = 300

1E-05Lead = 325

1E-05Lead = 350

1E-05Lead = 375

1E-05Lead = 400


Preconstruction Activities $4,349,000 $4,347,000 $4,344,000 $4,341,000 $4,341,000 $4,339,000 $4,336,000 $4,335,000

Site Preparation & Access $1,343,000 $1,332,000 $1,272,000 $1,240,000 $1,240,000 $1,233,000 $1,169,000 $1,163,000

Institutional Controls $285,000 $281,000 $275,000 $269,000 $269,000 $265,000 $259,000 $257,000

Contaminated Soil Excavation and Backfilling $386,000 $382,000 $369,000 $360,000 $360,000 $358,000 $342,000 $340,000

Capping/Cover/Liner $6,524,000 $6,480,000 $6,122,000 $6,030,000 $6,030,000 $6,006,000 $5,650,000 $5,629,000

Topsoil Cover & Revegetation $22,602,000 $22,451,000 $21,211,000 $20,891,000 $20,891,000 $20,807,000 $19,576,000 $19,497,000

Site Restoration and Final Survey $420,000 $414,000 $405,000 $396,000 $396,000 $390,000 $381,000 $378,000

Contractor's Oversight, H&S, Surveying $11,469,000 $11,387,000 $10,791,000 $10,616,000 $10,616,000 $10,571,000 $9,966,000 $9,924,000

Construction Subtotal $47,378,000 $47,074,000 $44,789,000 $44,143,000 $44,143,000 $43,969,000 $41,679,000 $41,523,000

ENGINEERING & CONSTRUCTION MANAGEMENT $15,519,000 $15,416,000 $14,652,000 $14,433,000 $14,433,000 $14,375,000 $13,606,000 $13,555,000

OPERATIONS AND MAINTENANCE $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000

Project Subtotal $79,308,000 $78,901,000 $75,852,000 $74,987,000 $74,987,000 $74,755,000 $71,696,000 $71,489,000

20% Contingency $15,862,000 $15,780,000 $15,170,000 $14,997,000 $14,997,000 $14,951,000 $14,339,000 $14,298,000

Project Total $95,170,000 $94,681,000 $91,022,000 $89,984,000 $89,984,000 $89,706,000 $86,035,000 $85,787,000

Cost


ON-SITE SOIL COVER + INSTITUTIONAL CONTROLSMATTHIESSEN AND HEGELER ZINC COMPANY SITE

Page 1 of 1

Estimate Category


1E-05Lead = 250

1E-05Lead = 275

1E-05Lead = 300

1E-05Lead = 325

1E-05Lead = 350

1E-05Lead = 375

1E-05Lead = 400




Contaminated Soil Excavation and Backfilling $9,686,000 $9,621,000 $9,089,000 $8,953,000 $8,953,000 $8,916,000 $8,389,000 $8,355,000

Contaminated Soil Consolidation or Disposal $1,616,000 $1,605,000 $1,516,000 $1,493,000 $1,493,000 $1,487,000 $1,399,000 $1,394,000

Capping/Cover/Liner $259,000 $258,000 $253,000 $2,000 $2,000 $2,000 $2,000 $2,000

Runoff Diversion & Erosion Control (Permanent) $1,603,300 $1,593,200 $1,510,500 $1,489,100 $1,489,100 $1,483,600 $1,483,600 $1,396,200








20% Contingency $16,023,000 $15,923,000 $15,119,000 $14,848,000 $14,848,000 $14,792,000 $14,015,000 $13,943,000

Project Total $96,138,000 $95,539,000 $90,715,000 $89,089,000 $89,089,000 $88,752,000 $84,089,000 $83,657,000

Cost

OU2 SOIL RES ALTERNATIVE 3 COST - REVISED LEAD RALSTABLE 4

SOIL EXCAVATION + ON-SITE CONSOLIDATION UNDER A SOIL COVERMATTHIESSEN AND HEGELER ZINC COMPANY SITE

Page 1 of 1

Estimate Category


1E-05Lead = 250

1E-05Lead = 275

1E-05Lead = 300

1E-05Lead = 325

1E-05Lead = 350

1E-05Lead = 375

1E-05Lead = 400




Contaminated Soil Excavation and Backfilling $9,686,000 $9,621,000 $9,089,000 $8,953,000 $8,953,000 $8,916,000 $8,389,000 $8,355,000

Contaminated Soil Consolidation or Disposal $41,518,000 $41,239,000 $38,962,000 $38,375,000 $38,375,000 $38,221,000 $35,959,000 $35,816,000








20% Contingency $25,371,000 $25,208,000 $23,887,000 $23,544,000 $23,544,000 $23,453,000 $22,141,000 $22,057,000

Project Total $152,227,000 $151,248,000 $143,323,000 $141,266,000 $141,266,000 $140,717,000 $132,848,000 $132,343,000

Cost


SOIL EXCAVATION + OFF-SITE DISPOSAL MATTHIESSEN AND HEGELER ZINC COMPANY SITE

Page 1 of 1

APPENDIX AOU2 SOIL VOLUME CALCULATIONS

TABLE RES-1SOIL RESIDENTIAL AREA AND VOLUME ESTIMATE FOR 1E-05, LEAD = 225

MATTHIESSEN AND HEGELER ZINC COMPANY SITE, LASALLE, ILLINOIS

EXTRAPOLATED TO ALL OF OU-2 residential area Alternative 2 - Soil Cover

Property Type 5Total No. Properties

Number Sampled 3

No. Properties Above Pb=225,

1E-05 RAL 3

Frequency > Pb=225, 1E-05

RAL 3

Alternate Frequency >

Pb=225, 1E-05 4

Avg. Green space per

property (ft2)Total Area

(ft2)Total Area (sq yards)

Total Area (acres)

12" soil cover - Volume

(CY)

Cover/ Fill per property

(CY)

Excavated

soil (1.5 ft2

/linear ft) CY

Geotextile/ marking layer

area (sq yd)

Zone 1Residential - typical 580 65 62 95% 554 2,095 1,160,630 128,959 27 42,986 78 7,044 128,959 Residential - large 0 0 97,784 - - - - - - -

Park/Church/School - typical 19 1 1 100% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 0 0 377,813 - - - - - - - Indust/Commer - typical 43 1 1 100% 43 2,965 127,495 14,166 3 4,722 110 650 14,166 Indust/Commer - large 1 1 182,092 182,092 20,232 4 6,744 6,744 119 20,232 Zone 2Residential - typical 795 45 30 67% 530 2,095 1,110,350 123,372 25 41,124 78 6,739 123,372 Residential - large 4 3 97,784 293,352 32,595 7 10,865 3,622 261 32,595

Park/Church/School - typical 36 11 5 45% 17 5,677 96,509 10,723 2 3,574 210 356 10,723 Park/Church/School - large 3 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 54 0 0 0% 63% 34 2,965 100,810 11,201 2 3,734 110 514 11,201 Indust/Commer - large 2 2 182,092 364,183 40,465 8 13,488 6,744 237 40,465 Zone 3Residential - typical 2158 51 34 67% 1439 2,095 3,014,705 334,967 69 111,656 78 18,296 334,967 Residential - large 1 1 97,784 97,784 10,865 2 3,622 3,622 87 10,865 Park/Church/School - typical 75 3 2 67% 50 5,677 283,850 31,539 7 10,513 210 1,046 31,539 Park/Church/School - large 2 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 306 2 1 50% 153 2,965 453,645 50,405 10 16,802 110 2,314 50,405 Indust/Commer - large 5 3 182,092 546,275 60,697 13 20,232 6,744 356 60,697 Zone 4Residential - typical 588 8 4 50% 294 2,095 615,930 68,437 14 22,812 78 3,738 68,437 Residential - large 9 5 97,784 488,920 54,324 11 18,108 3,622 434 54,324 Park/Church/School - typical 46 2 0 0% 40% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 5 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 31 0 0 0% 40% 13 2,965 38,545 4,283 1 1,428 110 197 4,283 Indust/Commer - large 5 2 182,092 364,183 40,465 8 13,488 6,744 237 40,465

Notes1. Assume 4% of soil in RES area requires disposal as a hazardous, for TCLP, waste

2. General assumption made on depth of RAL exceedance based on RI results. During RI soil was primarily collected from 0-6" Excavation 100 cy/dayinterval with a small percentage of samples collected from 6-12" bgs. No samples were collected below 12" bgs. Soil Cover 150 cy/dayForty-percent (40%) of samples collected between 6-12" bgs exceed one or more RALs. It is estimated Backfill 200 cy/daythat contamination is present at depths greater than 12", therefore 40% of the 6-12" samples would also exceed for 12-18" Hydroseed 18000 sq yd/dayand another 10% would exceed from 18-24"; resulting in final depth percentage breakdowns of the following:.

Depth % Exceed RALs0-6" 60%

6-12" 20%12-18" 16%18-24" 4%

3. Number of properties sampled and frequency of RAL exceedances is based on results from RI. Properties were sampled based on geographic distribution during the RI, and not on property-type. Therefore a number of property types have RAL exceedance frequencies of 0% due to small sample sizes or lack of sampling during the RI.

4. Alternate frequency is based on an average frequency for those property types sampled within each zone. Alternate frequency will be applied when zero properties were sampled of a given property type within a zone.5. Residential zones are shown on Figures 1 through 8.6. Assume soil expansion of 20% once soil is excavated from ground and placed in containers for removal or transport

Total No. Properties exceed

Pb=225, 1E-05 RAL

Rates

Page 1 of 2 August 2013

Property Type 5

Zone 1Residential - typicalResidential - large

Park/Church/School - typicalPark/Church/School - largeIndust/Commer - typicalIndust/Commer - large



Zone 3Residential - typicalResidential - largePark/Church/School - typicalPark/Church/School - largeIndust/Commer - typicalIndust/Commer - large





Alternative 3 + 4 - Excavate (onsite consolidation and offsite disposal)

% samples 0-6" only

(ft3)2

% samples 6-

12"(ft3) 2

% samples 12-18" (ft3)

2


2TOTAL

(CY)CY per

property

HAZARDOUS

SOIL (CY) 1,6

NON-HAZARDOUS

SOIL (CY) 6

60% 20% 16% 4%348,189 232,126 278,551 92,850 35,249 64 1,692 40,607

- - - - - - - -

32,359 21,573 25,887 8,629 3,276 172 157 3,774 - - - - - - - -

38,249 25,499 30,599 10,200 3,872 90 186 4,461 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%333,105 222,070 266,484 88,828 33,722 64 1,619 38,847

88,006 58,670 70,404 23,468 8,909 2,970 428 10,263

28,953 19,302 23,162 7,721 2,931 172 141 3,377 226,688 151,125 181,350 60,450 22,949 11,474 1,102 26,437

30,243 20,162 24,194 8,065 3,062 90 147 3,527 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742

60% 20% 16% 4%904,412 602,941 723,529 241,176 91,558 64 4,395 105,474

29,335 19,557 23,468 7,823 2,970 2,970 143 3,421 85,155 56,770 68,124 22,708 8,621 5,786 414 9,931

226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437 136,094 90,729 108,875 36,292 13,777 90 661 15,872 163,882 109,255 131,106 43,702 16,591 5,530 796 19,112

60% 20% 16% 4%184,779 123,186 147,823 49,274 18,706 64 898 21,549 146,676 97,784 117,341 39,114 14,849 2,970 713 17,106

32,359 21,573 25,887 8,629 3,276 2,199 157 3,774 226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437

11,564 7,709 9,251 3,084 1,171 90 56 1,349 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742







Number Sampled 3


1E-05 RAL 3


RAL 3


Pb=250, 1E-05 4




Total Area (acres)


(CY)


(CY)

Excavated

soil (1.5 ft2

/linear ft) CY


area (sq yd)

Zone 1Residential - typical 580 65 62 95% 554 2,095 1,160,630 128,959 27 42,986 78 7,044 128,959 Residential - large 0 0 97,784 - - 0 - - - -

Park/Church/School - typical 19 1 1 100% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 0 0 377,813 - - 0 - - - - Indust/Commer - typical 43 1 1 100% 43 2,965 127,495 14,166 3 4,722 110 650 14,166 Indust/Commer - large 1 1 182,092 182,092 20,232 4 6,744 6,744 119 20,232 Zone 2Residential - typical 795 45 28 62% 495 2,095 1,037,025 115,225 24 38,408 78 6,294 115,225 Residential - large 4 3 97,784 293,352 32,595 7 10,865 3,622 261 32,595

Park/Church/School - typical 36 11 5 45% 17 5,677 96,509 10,723 2 3,574 210 356 10,723 Park/Church/School - large 3 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 54 0 0 0% 59% 32 2,965 94,880 10,542 2 3,514 110 484 10,542 Indust/Commer - large 2 2 182,092 364,183 40,465 8 13,488 6,744 237 40,465 Zone 3Residential - typical 2158 51 34 67% 1439 2,095 3,014,705 334,967 69 111,656 78 18,296 334,967 Residential - large 1 1 97,784 97,784 10,865 2 3,622 3,622 87 10,865 Park/Church/School - typical 75 3 2 67% 50 5,677 283,850 31,539 7 10,513 210 1,046 31,539 Park/Church/School - large 2 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 306 2 1 50% 153 2,965 453,645 50,405 10 16,802 110 2,314 50,405 Indust/Commer - large 5 3 182,092 546,275 60,697 13 20,232 6,744 356 60,697 Zone 4Residential - typical 588 8 4 50% 294 2,095 615,930 68,437 14 22,812 78 3,738 68,437 Residential - large 9 5 97,784 488,920 54,324 11 18,108 3,622 434 54,324 Park/Church/School - typical 46 2 0 0% 40% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 5 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 31 0 0 0% 40% 13 2,965 38,545 4,283 1 1,428 110 197 4,283 Indust/Commer - large 5 2 182,092 364,183 40,465 8 13,488 6,744 237 40,465




6-12" 20%12-18" 16%18-24" 4%




Pb=250, 1E-05 RAL

Rates


Property Type 5











% samples 0-6" only

(ft3)2

% samples 6-

12"(ft3) 2


2


2TOTAL

(CY)CY per

property

HAZARDOUS

SOIL (CY) 1,6

NON-HAZARDOUS

SOIL (CY) 6

60% 20% 16% 4%348,189 232,126 278,551 92,850 35,249 64 1,692 40,607

- - - - - - - -

32,359 21,573 25,887 8,629 3,276 172 157 3,774 - - - - - - - -

38,249 25,499 30,599 10,200 3,872 90 186 4,461 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%311,108 207,405 248,886 82,962 31,495 64 1,512 36,282

88,006 58,670 70,404 23,468 8,909 2,970 428 10,263

28,953 19,302 23,162 7,721 2,931 172 141 3,377 226,688 151,125 181,350 60,450 22,949 11,474 1,102 26,437

28,464 18,976 22,771 7,590 2,882 90 138 3,320 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742

60% 20% 16% 4%904,412 602,941 723,529 241,176 91,558 64 4,395 105,474

29,335 19,557 23,468 7,823 2,970 2,970 143 3,421 85,155 56,770 68,124 22,708 8,621 5,786 414 9,931

226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437 136,094 90,729 108,875 36,292 13,777 90 661 15,872 163,882 109,255 131,106 43,702 16,591 5,530 796 19,112

60% 20% 16% 4%184,779 123,186 147,823 49,274 18,706 64 898 21,549 146,676 97,784 117,341 39,114 14,849 2,970 713 17,106

32,359 21,573 25,887 8,629 3,276 2,199 157 3,774 226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437

11,564 7,709 9,251 3,084 1,171 90 56 1,349 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742







Number Sampled 3


1E-05 RAL 3


RAL 3


Pb=275, 1E-05 4




Total Area (acres)


(CY)


(CY)

Excavated

soil (1.5 ft2

/linear ft) CY


area (sq yd)


Park/Church/School - typical 19 1 1 100% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 0 0 377,813 - - 0 - - - - Indust/Commer - typical 43 1 1 100% 43 2,965 127,495 14,166 3 4,722 110 650 14,166 Indust/Commer - large 1 1 182,092 182,092 20,232 4 6,744 6,744 119 20,232 Zone 2Residential - typical 795 45 27 60% 477 2,095 999,315 111,035 23 37,012 78 6,065 111,035 Residential - large 4 3 97,784 293,352 32,595 7 10,865 3,622 261 32,595

Park/Church/School - typical 36 11 5 45% 17 5,677 96,509 10,723 2 3,574 210 356 10,723 Park/Church/School - large 3 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 54 0 0 0% 57% 31 2,965 91,915 10,213 2 3,404 110 469 10,213 Indust/Commer - large 2 2 182,092 364,183 40,465 8 13,488 6,744 237 40,465 Zone 3Residential - typical 2158 51 33 65% 1397 2,095 2,926,715 325,191 67 108,397 78 17,762 325,191 Residential - large 1 1 97,784 97,784 10,865 2 3,622 3,622 87 10,865 Park/Church/School - typical 75 3 1 33% 25 5,677 141,925 15,769 3 5,256 210 523 15,769 Park/Church/School - large 2 1 377,813 377,813 41,979 9 13,993 13,993 171 41,979 Indust/Commer - typical 306 2 1 50% 153 2,965 453,645 50,405 10 16,802 110 2,314 50,405 Indust/Commer - large 5 3 182,092 546,275 60,697 13 20,232 6,744 356 60,697 Zone 4Residential - typical 588 8 4 50% 294 2,095 615,930 68,437 14 22,812 78 3,738 68,437 Residential - large 9 5 97,784 488,920 54,324 11 18,108 3,622 434 54,324 Park/Church/School - typical 46 2 0 0% 40% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 5 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 31 0 0 0% 40% 13 2,965 38,545 4,283 1 1,428 110 197 4,283 Indust/Commer - large 5 2 182,092 364,183 40,465 8 13,488 6,744 237 40,465




6-12" 20%12-18" 16%18-24" 4%




Pb=275, 1E-05 RAL

Rates


Property Type 5











% samples 0-6" only

(ft3)2

% samples 6-

12"(ft3) 2


2


2TOTAL

(CY)CY per

property

HAZARDOUS

SOIL (CY) 1,6

NON-HAZARDOUS

SOIL (CY) 6

60% 20% 16% 4%348,189 232,126 278,551 92,850 35,249 64 1,692 40,607

- - - - - - - -

32,359 21,573 25,887 8,629 3,276 172 157 3,774 - - - - - - - -

38,249 25,499 30,599 10,200 3,872 90 186 4,461 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%299,795 199,863 239,836 79,945 30,350 64 1,457 34,963

88,006 58,670 70,404 23,468 8,909 2,970 428 10,263

28,953 19,302 23,162 7,721 2,931 172 141 3,377 226,688 151,125 181,350 60,450 22,949 11,474 1,102 26,437

27,575 18,383 22,060 7,353 2,791 90 134 3,216 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742

60% 20% 16% 4%878,015 585,343 702,412 234,137 88,885 64 4,267 102,396

29,335 19,557 23,468 7,823 2,970 2,970 143 3,421 42,578 28,385 34,062 11,354 4,310 2,893 207 4,965

113,344 75,563 90,675 30,225 11,474 7,701 551 13,218 136,094 90,729 108,875 36,292 13,777 90 661 15,872 163,882 109,255 131,106 43,702 16,591 5,530 796 19,112

60% 20% 16% 4%184,779 123,186 147,823 49,274 18,706 64 898 21,549 146,676 97,784 117,341 39,114 14,849 2,970 713 17,106

32,359 21,573 25,887 8,629 3,276 2,199 157 3,774 226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437

11,564 7,709 9,251 3,084 1,171 90 56 1,349 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742



TABLE RES-4SOIL RESIDENTIAL AREA AND VOLUME ESTIMATE FOR 1E-05, LEAD = 300 & LEAD = 325




Number Sampled 3

No. Properties Above

Pb=325&300,

1E-05 RAL 3,7

Frequency > Pb=325&300,

1E-05 RAL 3,7


Pb=325&300,

1E-05 4




Total Area (acres)


(CY)


(CY)

Excavated

soil (1.5 ft2

/linear ft) CY


area (sq yd)


Park/Church/School - typical 19 1 1 100% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 0 0 377,813 - - 0 - - - - Indust/Commer - typical 43 1 1 100% 43 2,965 127,495 14,166 3 4,722 110 650 14,166 Indust/Commer - large 1 1 182,092 182,092 20,232 4 6,744 6,744 119 20,232 Zone 2Residential - typical 795 45 25 56% 442 2,095 925,990 102,888 21 34,296 78 5,620 102,888 Residential - large 4 3 97,784 293,352 32,595 7 10,865 3,622 261 32,595





6-12" 20%12-18" 16%18-24" 4%


4. Alternate frequency is based on an average frequency for those property types sampled within each zone. Alternate frequency will be applied when zero properties were sampled of a given property type within a zone.5. Residential zones are shown on Figures 1 through 8.6. Assume soil expansion of 20% once soil is excavated from ground and placed in containers for removal or transport7. Lead values 300 mg/kg and 325 mg/kg have the same number of properties that exceed the lead values and RALs; therefore the calculations for both values are shown on this sheet.

Total No. Properties exceed Pb=325&300, 1E-

05 RAL

Rates


Property Type 5








TABLE RES-4SOIL RESIDENTIAL AREA AND VOLUME ESTIMATE FOR 1E-05, LEAD = 300 & LEAD = 325



% samples 0-6" only

(ft3)2

% samples 6-

12"(ft3) 2


2


2TOTAL

(CY)CY per

property

HAZARDOUS

SOIL (CY) 1,6

NON-HAZARDOUS

SOIL (CY) 6

60% 20% 16% 4%348,189 232,126 278,551 92,850 35,249 64 1,692 40,607

- - - - - - - -

32,359 21,573 25,887 8,629 3,276 172 157 3,774 - - - - - - - -

38,249 25,499 30,599 10,200 3,872 90 186 4,461 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%277,797 185,198 222,238 74,079 28,123 64 1,350 32,397

88,006 58,670 70,404 23,468 8,909 2,970 428 10,263

28,953 19,302 23,162 7,721 2,931 172 141 3,377 226,688 151,125 181,350 60,450 22,949 11,474 1,102 26,437

25,796 17,197 20,636 6,879 2,611 90 125 3,008 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742

60% 20% 16% 4%851,618 567,745 681,294 227,098 86,213 64 4,138 99,318

29,335 19,557 23,468 7,823 2,970 2,970 143 3,421 42,578 28,385 34,062 11,354 4,310 2,893 207 4,965

113,344 75,563 90,675 30,225 11,474 7,701 551 13,218 136,094 90,729 108,875 36,292 13,777 90 661 15,872 163,882 109,255 131,106 43,702 16,591 5,530 796 19,112

60% 20% 16% 4%184,779 123,186 147,823 49,274 18,706 64 898 21,549 146,676 97,784 117,341 39,114 14,849 2,970 713 17,106

32,359 21,573 25,887 8,629 3,276 2,199 157 3,774 226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437

11,564 7,709 9,251 3,084 1,171 90 56 1,349 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742







Number Sampled 3


1E-05 RAL 3


RAL 3


Pb=350, 1E-05 4




Total Area (acres)


(CY)


(CY)

Excavated

soil (1.5 ft2

/linear ft) CY


area (sq yd)


Park/Church/School - typical 19 1 1 100% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 0 0 377,813 - - 0 - - - - Indust/Commer - typical 43 1 0 0% 95% 42 2,965 124,530 13,837 3 4,612 110 635 13,837 Indust/Commer - large 1 1 182,092 182,092 20,232 4 6,744 6,744 119 20,232 Zone 2Residential - typical 795 45 24 53% 424 2,095 888,280 98,698 20 32,899 78 5,391 98,698 Residential - large 4 3 97,784 293,352 32,595 7 10,865 3,622 261 32,595





6-12" 20%12-18" 16%18-24" 4%




Pb=350, 1E-05 RAL

Rates


Property Type 5











% samples 0-6" only

(ft3)2

% samples 6-

12"(ft3) 2


2


2TOTAL

(CY)CY per

property

HAZARDOUS

SOIL (CY) 1,6

NON-HAZARDOUS

SOIL (CY) 6

60% 20% 16% 4%348,189 232,126 278,551 92,850 35,249 64 1,692 40,607

- - - - - - - -

32,359 21,573 25,887 8,629 3,276 172 157 3,774 - - - - - - - -

37,359 24,906 29,887 9,962 3,782 90 182 4,357 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%266,484 177,656 213,187 71,062 26,977 64 1,295 31,078

88,006 58,670 70,404 23,468 8,909 2,970 428 10,263

28,953 19,302 23,162 7,721 2,931 172 141 3,377 226,688 151,125 181,350 60,450 22,949 11,474 1,102 26,437

24,906 16,604 19,925 6,642 2,521 90 121 2,905 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742

60% 20% 16% 4%851,618 567,745 681,294 227,098 86,213 64 4,138 99,318

29,335 19,557 23,468 7,823 2,970 2,970 143 3,421 42,578 28,385 34,062 11,354 4,310 2,893 207 4,965

113,344 75,563 90,675 30,225 11,474 7,701 551 13,218 136,094 90,729 108,875 36,292 13,777 90 661 15,872 163,882 109,255 131,106 43,702 16,591 5,530 796 19,112

60% 20% 16% 4%184,779 123,186 147,823 49,274 18,706 64 898 21,549 146,676 97,784 117,341 39,114 14,849 2,970 713 17,106

32,359 21,573 25,887 8,629 3,276 2,199 157 3,774 226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437

11,564 7,709 9,251 3,084 1,171 90 56 1,349 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742







Number Sampled 3


1E-05 RAL 3


RAL 3


Pb=375, 1E-05 4




Total Area (acres)


(CY)


(CY)

Excavated

soil (1.5 ft2

/linear ft) CY


area (sq yd)


Park/Church/School - typical 19 1 1 100% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 0 0 377,813 - - 0 - - - - Indust/Commer - typical 43 1 0 0% 95% 42 2,965 124,530 13,837 3 4,612 110 635 13,837 Indust/Commer - large 1 1 182,092 182,092 20,232 4 6,744 6,744 119 20,232 Zone 2Residential - typical 795 45 22 49% 389 2,095 814,955 90,551 19 30,184 78 4,946 90,551 Residential - large 4 2 97,784 195,568 21,730 4 7,243 3,622 174 21,730





6-12" 20%12-18" 16%18-24" 4%




Pb=375, 1E-05 RAL

Rates


Property Type 5











% samples 0-6" only

(ft3)2

% samples 6-

12"(ft3) 2


2


2TOTAL

(CY)CY per

property

HAZARDOUS

SOIL (CY) 1,6

NON-HAZARDOUS

SOIL (CY) 6

60% 20% 16% 4%348,189 232,126 278,551 92,850 35,249 64 1,692 40,607

- - - - - - - -

32,359 21,573 25,887 8,629 3,276 172 157 3,774 - - - - - - - -

37,359 24,906 29,887 9,962 3,782 90 182 4,357 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%244,487 162,991 195,589 65,196 24,750 64 1,188 28,513

58,670 39,114 46,936 15,645 5,939 2,970 285 6,842

28,953 19,302 23,162 7,721 2,931 172 141 3,377 226,688 151,125 181,350 60,450 22,949 11,474 1,102 26,437

24,017 16,011 19,213 6,404 2,431 90 117 2,801 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%851,618 567,745 681,294 227,098 86,213 64 4,138 99,318

29,335 19,557 23,468 7,823 2,970 2,970 143 3,421 42,578 28,385 34,062 11,354 4,310 2,893 207 4,965

113,344 75,563 90,675 30,225 11,474 7,701 551 13,218 136,094 90,729 108,875 36,292 13,777 90 661 15,872 163,882 109,255 131,106 43,702 16,591 5,530 796 19,112

60% 20% 16% 4%138,899 92,599 111,119 37,040 14,061 64 675 16,199 117,341 78,227 93,873 31,291 11,879 2,970 570 13,685

23,843 15,896 19,075 6,358 2,414 1,620 116 2,781 226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437

8,895 5,930 7,116 2,372 900 90 43 1,037 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742






Property Type 5Total No. Properties Number Sampled 3


1E-05 RAL 3


RAL 3


Pb=400, 1E-05 4




Total Area (acres)


(CY)


(CY)

Excavated

soil (1.5 ft2

/linear ft) CY


area (sq yd)

Zone 1Residential - typical 580 65 62 95% 554 2,095 1,160,630 128,959 27 42,986 78 7,044 128,959 Residential - large 0 0 97,784 - - 0 - - - - Park/Church/School - typical 19 1 1 100% 19 5,677 107,863 11,985 2 3,995 210 398 11,985 Park/Church/School - large 0 0 377,813 - - 0 - - - - Indust/Commer - typical 43 1 0 0% 95% 42 2,965 124,530 13,837 3 4,612 110 635 13,837 Indust/Commer - large 1 1 182,092 182,092 20,232 4 6,744 6,744 119 20,232

Zone 2Residential - typical 795 45 21 47% 371 2,095 777,245 86,361 18 28,787 78 4,717 86,361 Residential - large 4 2 97,784 195,568 21,730 4 7,243 3,622 174 21,730 Park/Church/School - typical 36 11 5 45% 17 5,677 96,509 10,723 2 3,574 210 356 10,723 Park/Church/School - large 3 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 54 0 0 0% 46% 26 2,965 77,090 8,566 2 2,855 110 393 8,566 Indust/Commer - large 2 1 182,092 182,092 20,232 4 6,744 6,744 119 20,232 Zone 3Residential - typical 2158 51 32 63% 1355 2,095 2,838,725 315,414 65 105,138 78 17,228 315,414 Residential - large 1 1 97,784 97,784 10,865 2 3,622 3,622 87 10,865 Park/Church/School - typical 75 3 1 33% 25 5,677 141,925 15,769 3 5,256 210 523 15,769 Park/Church/School - large 2 1 377,813 377,813 41,979 9 13,993 13,993 171 41,979 Indust/Commer - typical 306 2 1 50% 153 2,965 453,645 50,405 10 16,802 110 2,314 50,405 Indust/Commer - large 5 3 182,092 546,275 60,697 13 20,232 6,744 356 60,697 Zone 4Residential - typical 588 8 3 38% 221 2,095 462,995 51,444 11 17,148 78 2,810 51,444 Residential - large 9 4 97,784 391,136 43,460 9 14,487 3,622 347 43,460 Park/Church/School - typical 46 2 0 0% 30% 14 5,677 79,478 8,831 2 2,944 210 293 8,831 Park/Church/School - large 5 2 377,813 755,626 83,958 17 27,986 13,993 341 83,958 Indust/Commer - typical 31 0 0 0% 30% 10 2,965 29,650 3,294 1 1,098 110 151 3,294 Indust/Commer - large 5 2 182,092 364,183 40,465 8 13,488 6,744 237 40,465

Notes

1. Assume 4% of soil in RES area requires disposal as a hazardous, for TCLP, waste Excavation 100 cy/day2. General assumption made on depth of RAL exceedance based on RI results. During RI soil was primarily collected from 0-6" Soil Cover 150 cy/day

interval with a small percentage of samples collected from 6-12" bgs. No samples were collected below 12" bgs. Backfill 200 cy/dayForty-percent (40%) of samples collected between 6-12" bgs exceed one or more RALs. It is estimated Hydroseed 18000 sq yd/daythat contamination is present at depths greater than 12", therefore 40% of the 6-12" samples would also exceed for 12-18"and another 10% would exceed from 18-24"; resulting in final depth percentage breakdowns of the following:.


6-12" 20%12-18" 16%18-24" 4%




Pb=400, 1E-05 RAL

Rates


Property Type 5









% samples 0-6" only

(ft3)2

% samples

6-12"(ft3) 2

% samples 12-18"

(ft3) 2

% samples

18-24" (ft3) 2TOTAL

(CY)CY per

property

HAZARDOUS

SOIL (CY) 1,6

NON-HAZARDOUS

SOIL (CY) 6

60% 20% 16% 4%348,189 232,126 278,551 92,850 35,249 64 1,692 40,607

- - - - - - - - 32,359 21,573 25,887 8,629 3,276 172 157 3,774

- - - - - - - - 37,359 24,906 29,887 9,962 3,782 90 182 4,357 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%233,174 155,449 186,539 62,180 23,605 64 1,133 27,193

58,670 39,114 46,936 15,645 5,939 2,970 285 6,842 28,953 19,302 23,162 7,721 2,931 172 141 3,377

226,688 151,125 181,350 60,450 22,949 11,474 1,102 26,437 23,127 15,418 18,502 6,167 2,341 90 112 2,697 54,627 36,418 43,702 14,567 5,530 5,530 265 6,371

60% 20% 16% 4%851,618 567,745 681,294 227,098 86,213 64 4,138 99,318

29,335 19,557 23,468 7,823 2,970 2,970 143 3,421 42,578 28,385 34,062 11,354 4,310 2,893 207 4,965

113,344 75,563 90,675 30,225 11,474 7,701 551 13,218 136,094 90,729 108,875 36,292 13,777 90 661 15,872 163,882 109,255 131,106 43,702 16,591 5,530 796 19,112

60% 20% 16% 4%138,899 92,599 111,119 37,040 14,061 64 675 16,199 117,341 78,227 93,873 31,291 11,879 2,970 570 13,685

23,843 15,896 19,075 6,358 2,414 1,620 116 2,781 226,688 151,125 181,350 60,450 22,949 15,403 1,102 26,437

8,895 5,930 7,116 2,372 900 90 43 1,037 109,255 72,837 87,404 29,135 11,060 5,530 531 12,742



TABLE RES-8SUMMARY TABLE


Zone 1Total No. Properties

Number properties sampled

Total No. Properties exceed RAL

Total Area (ft2)

12" soil cover - Volume (CY)

Excavated soil

(1.5 ft2 /linear ft) CY


area (sq yd)

Time

(months) 1 TOTAL (CY)HAZ. SOIL

(CY) NON-HAZ. SOIL (CY)

Residential property Backfill

(CY)

Residential property Topsoil

(top 0.5 ft) CY

On-site consolidation backfill (CY)

On-site consolidation topsoil (CY)

Alt 3a ON-SITE Time

(months) 1

Alt 3b OFF-SITE Time

(months) 1

1 643 67 64 1,578,080 58,447 8,210 175,342 21 47,927 2,300 55,212 29,224 29,224 900 16 24 24 2 894 56 35 2,720,830 100,771 8,448 302,314 34 82,633 3,966 95,193 50,386 50,386 1,552 27 42 42 3 2547 56 37 5,151,885 190,811 22,440 572,432 68 156,465 7,510 180,247 95,405 95,405 2,939 52 80 79 4 684 10 4 2,371,067 87,817 5,345 263,452 29 72,010 3,456 82,956 43,909 43,909 1,353 24 37 37

Sum 4768 189 140 11,821,862 437,847 44,443 1,313,540 153 359,034 17,234 413,608 218,923 218,923 6,744 119 183 182




Total Area (ft2)


Excavated soil



area (sq yd)

Time



Residential Property Backfill

(CY)

Residential Property Topsoil

(top 0.5 ft) CY



Alt 3a ON-SITE Time

(months) 1


(months) 1

1 643 67 64 1,578,080 58,447 8,210 175,342 21 47,927 2,300 55,212 29,223.70 29,224 906 16 24 24 2 894 56 33 2,641,575 97,836 7,972 293,508 33 80,226 3,851 92,420 48,918 48,918 1,517 27 41 41 3 2547 56 37 5,151,885 190,811 22,440 572,432 68 156,465 7,510 180,247 95,405 95,405 2,959 52 80 79 4 684 10 4 2,371,067 87,817 5,345 263,452 29 72,010 3,456 82,956 43,909 43,909 1,362 24 37 37

Sum 4768 189 138 11,742,607 434,911 43,968 1,304,734 152 356,627 17,118 410,835 217,456 217,456 6,744 119 181 181




Total Area (ft2)


Excavated soil



area (sq yd)

Time




(CY)


(top 0.5 ft) CY



Alt 3a ON-SITE Time

(months) 1


(months) 1

1 643 67 64 1,578,080 58,447 8,210 175,342 21 47,927 2,300 55,212 29,223.70 29,224 959 17 24 24 2 894 56 32 2,600,900 96,330 7,729 288,989 33 78,990 3,792 90,997 48,165 48,165 1,581 28 40 40 3 2547 56 35 4,544,157 168,302 21,212 504,906 61 138,008 6,624 158,985 84,151 84,151 2,762 49 70 70 4 684 10 4 2,371,067 87,817 5,345 263,452 29 72,010 3,456 82,956 43,909 43,909 1,441 25 37 37

Sum 4768 189 135 11,094,204 410,896 42,496 1,232,689 144 336,935 16,173 388,149 205,448 205,448 6,744 119 171 171

LEAD = 225, 1E-05

LEAD = 250, 1E-05

LEAD = 275, 1E-05

Alt 2 Alt 3a+3b

Alt 2 Alt 3a+3b

Alt 2 Alt 3a+3b





Total Area (ft2)


Excavated soil



area (sq yd)

Time




(CY)


(top 0.5 ft) CY



Alt 3a ON-SITE Time

(months) 1


(months) 1

1 643 67 64 1,578,080 58,447 8,210 175,342 21 47,927 2,300 55,212 29,224 29,224 974 17 24 24 2 894 56 30 2,521,645 93,394 7,253 280,183 32 76,583 3,676 88,224 46,697 46,697 1,556 27 39 39 3 2547 56 34 4,456,167 165,043 20,678 495,130 59 135,335 6,496 155,906 82,522 82,522 2,750 48 69 69 4 684 10 4 2,371,067 87,817 5,345 263,452 29 72,010 3,456 82,956 43,909 43,909 1,463 26 37 37

Sum 4768 189 132 10,926,959 404,702 41,487 1,214,107 141 331,856 15,929 382,298 202,351 202,351 6,744 119 169 168




Total Area (ft2)


Excavated soil



area (sq yd)

Time


(CY)

NON-HAZARDOUS SOIL (CY)


(CY)


(top 0.5 ft) CY



Alt 3a ON-SITE Time

(months) 1


(months) 1

1 643 67 63 1,575,115 58,338 8,195 175,013 21 47,837 2,296 55,108 29,169 29,169 976 17 24 24 2 894 56 29 2,480,970 91,888 7,009 275,663 31 75,348 3,617 86,801 45,944 45,944 1,537 27 38 38 3 2547 56 34 4,456,167 165,043 20,678 495,130 59 135,335 6,496 155,906 82,522 82,522 2,761 49 69 69 4 684 10 4 2,371,067 87,817 5,345 263,452 29 72,010 3,456 82,956 43,909 43,909 1,469 26 37 37

Sum 4768 189 130 10,883,319 403,086 41,228 1,209,258 141 330,530 15,865 380,771 201,543 201,543 6,744 119 168 168




Total Area (ft2)


Excavated soil



area (sq yd)

Time


(CY)



(CY)


(top 0.5 ft) CY



Alt 3a ON-SITE Time

(months) 1


(months) 1

1 643 67 63 1,575,115 58,338 8,195 175,013 21 47,837 2,296 55,108 29,169 29,169 1,037 18 24 24 2 894 56 27 2,124,805 78,696 6,344 236,089 27 64,531 3,097 74,340 39,348 39,348 1,400 25 33 33 3 2547 56 34 4,456,167 165,043 20,678 495,130 59 135,335 6,496 155,906 82,522 82,522 2,935 52 69 69 4 684 10 3 2,083,068 77,151 4,180 231,452 25 63,264 3,037 72,880 38,575 38,575 1,372 24 32 32

Sum 4768 189 127 10,239,154 379,228 39,397 1,137,684 133 310,967 14,926 358,234 189,614 189,614 6,744 119 158 158




Total Area (ft2)


Excavated soil



area (sq yd)

Time


(CY)



(CY)


(top 0.5 ft) CY



Alt 3a ON-SITE Time

(months) 1


(months) 1

1 643 67 63 1,575,115 58,338 8,195 175,013 21 47,837 2,296 55,108 29,169 29,169 1,042 18 24 24 2 894 56 26 2,084,130 77,190 6,100 231,570 26 63,296 3,038 72,917 38,595 38,595 1,378 24 32 32 3 2547 56 34 4,456,167 165,043 20,678 495,130 59 135,335 6,496 155,906 82,522 82,522 2,947 52 69 69 4 684 10 3 2,083,068 77,151 4,180 231,452 25 63,264 3,037 72,880 38,575 38,575 1,378 24 32 32

Sum 4768 189 126 10,198,479 377,721 39,153 1,133,164 132 309,732 14,867 356,811 188,861 188,861 6,744 119 158 157

Notes:1. The time estimates assume that the work is completed at the following rates (5 day work week):

Excavation 100 cy/daySoil Cover 150 cy/day

Backfill 200 cy/dayHydroseed 18000 sq yd/day

LEAD = 300 & 325, 1E-05Alt 2 Alt 3a+3b

LEAD = 350, 1E-05Alt 2 Alt 3a+3b




APPENDIX BBASIS FOR COST ESTIMATES

TABLE RES-1OU2 SOIL RES ALT 1: NO ACTION

MATTHIESSEN & HEGELER ZINC COMPANY SITE

Cost Estimating Activity Unit Cost Units No. of Units Cost No. of Units Cost No. of Units Cost No. of Units Cost No. of Units Cost No. of Units Cost No. of Units Cost No. of Units Cost NotesLead = 225, Risk = 1E-05 Lead = 250, Risk = 1E-05 Lead = 275, Risk = 1E-05 Lead = 300, Risk = 1E-05 Lead = 325, Risk = 1E-05 Lead = 350, Risk = 1E-05 Lead = 375, Risk = 1E-05 Lead = 400, Risk = 1E-05

REMEDY CONSTRUCTION

CONSTRUCTION SUBTOTAL 1E-04 = $0 1E-05 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0

ENGINEERING AND CONSTRUCTION MANAGEMENTENGINEERING & CM SUBTOTAL 1E-04 = $0 1E-05 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0

CONSTRUCTION & ENGINEERING TOTAL 1E-04 = $0 1E-05 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0 1E-06 = $0

OPERATIONS AND MAINTENANCEAnnual O&M Years 0 $0 0 $0 0 $0 0 $0 0 $0 0 $0 0 $0 0 $05 Year Remedy Reviews Reviews 6 $19,000 6 $19,000 6 $19,000 6 $19,000 6 $19,000 6 $19,000 6 $19,000 6 $19,000

Net Present Value of O&M and Remedy Reviews (Interest Rate = 5%) 1E-04 = $19,000 1E-05 = $19,000 1E-06 = $19,000 1E-06 = $19,000 1E-06 = $19,000 1E-06 = $19,000 1E-06 = $19,000 1E-06 = $19,000

TOTAL CONSTRUCTION, ENGINEERING, AND O&M COST 1E-04 = $19,000 1E-05 = $19,000 1E-06 = $19,000 1E-06 = $19,000 1E-06 = $19,000 1E-06 = $19,000 1E-06 = $19,000 1E-06 = $19,000

CONTINGENCY

Contingency 20 % of Project Cost $4,000 $4,000 $4,000 $4,000 $4,000 $4,000 $4,000 $4,000

TOTAL COST 1E-04 = $23,000 1E-05 = $23,000 1E-06 = $23,000 1E-06 = $23,000 1E-06 = $23,000 1E-06 = $23,000 1E-06 = $23,000 1E-06 = $23,000

Page 1 of 1


TABLE RES-2OU2 SOIL RES ALT 2: ON-SITE SOIL COVER + INSTITUTIONAL CONTROLS



REMEDY CONSTRUCTIONPreconstruction Activities

Mobilization & Demobilization $250,000 LS 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000Construction Surveying $2,000 Day 70 $140,000 69 $138,000 68 $135,000 66 $132,000 66 $132,000 65 $130,000 64 $127,000 63 $126,000 Assume 2 properties surveyed per dayContractor Prepared Preconstruction Plans HASP $6,000 LS 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 SWPPP Plan $15,000 LS 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 Traffic Plan $10,000 LS 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 Work Plan $8,000 LS 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 Sampling Plan $6,000 LS 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000Pre-Design Sampling

Pre-remedial soil sampling labor $84.35 hrs 19,072 $1,609,000 19,072 $1,609,000 19,072 $1,609,000 19,072 $1,609,000 19,072 $1,609,000 19,072 $1,609,000 19,072 $1,609,000 19,072 $1,609,000

Includes pre-field, field, post-field labor, and reporting for remaining 4768 properties in RES area of OU2. Assumes 4 hrs per property.

Coordination with Residents $350.00 property 4579 $1,603,000 4579 $1,603,000 4579 $1,603,000 4579 $1,603,000 4579 $1,603,000 4579 $1,603,000 4579 $1,603,000 4579 $1,603,000

Secure access agreements for pre-remedial sampling and remediation. Assume all 4574 unsampled OU2 off-site residential area properties require access agreements, assume 4 hours per property.

TCLP analysis (non CLP) $110.00 sample 5495 $604,000 5495 $604,000 5495 $604,000 5495 $604,000 5495 $604,000 5495 $604,000 5495 $604,000 5495 $604,000

Assume 15% of samples submitted for TCLP analysis. (8 CLP samples per property, and 1.2 TCLP samples per property)

Car/Gas $600.00 wk 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000

Assume 4 FTE, 2 field teams, 10 hr/day, 2 hr/property sampled, for pre-remedial sampling labor

Per diem (hotel/food) $156.00 day 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000

Assume 4 FTE, 2 field teams, 10 hr/day, 2 hr/property sampled, for pre-remedial sampling labor

Materials/team $120.00 wk 38.1 $5,000 38.1 $5,000 38.1 $5,000 38.1 $5,000 38.1 $5,000 38.1 $5,000 38.1 $5,000 38.1 $5,000 Includes XRF analyzer

CLP Shipping $250.00 wk 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000

Assumes 10% of samples shipped to CLP for confirmation analysis, approximately 5 coolers per week

Subtotal $4,349,000 $4,347,000 $4,344,000 $4,341,000 $4,341,000 $4,339,000 $4,336,000 $4,335,000Site Preparation & Access

Tree and Brush Removal - Low Density $600 10,000 Sq Ft 1,182 $709,000 1,174 $705,000 1,109 $666,000 1,093 $656,000 1,093 $656,000 1,088 $653,000 1,024 $614,000 1,020 $612,000Coordination with Residents $18 property 140 $3,000 138 $2,000 135 $2,000 132 $2,000 132 $2,000 130 $2,000 127 $2,000 126 $2,000

Decontamination Area $10,000 LS 1 $10,000 1 $10,000 1 $10,000 - $0 - $0 - $0 - $0 - $0Includes materials, power, and water to operate decontamination area

Perimeter Air Monitoring for Metals $31,460 Month 20 $621,000 20 $615,000 19 $594,000 18 $580,000 18 $580,000 18 $576,000 18 $551,000 17 $547,000

Assume air monitoring to be performed during excavation only. Excavation rate of 100 cy/day.

Subtotal $1,343,000 $1,332,000 $1,272,000 $1,240,000 $1,240,000 $1,233,000 $1,169,000 $1,163,000Institutional Controls

Residential Deed Restrictions $2,000 property 140 $280,000 138 $276,000 135 $270,000 132 $264,000 132 $264,000 130 $260,000 127 $254,000 126 $252,000Institutional Control Monitoring Plan (ICMP) $5,000 LS 1 $5,000 1 $5,000 1 $5,000 1 $5,000 1 $5,000 1 $5,000 1 $5,000 1 $5,000

Subtotal $285,000 $281,000 $275,000 $269,000 $269,000 $265,000 $259,000 $257,000Contaminated Soil Excavation and Backfilling

Contaminated Soil Excavation & Temporary Stockpiling $6 Cu Yd 44,443 $267,000 43,968 $264,000 42,496 $255,000 41,487 $249,000 41,487 $249,000 41,228 $247,000 39,397 $236,000 39,153 $235,000

Confirmation Sampling & Analysis $2.68 Cu Yd 44,443 $119,000 43,968 $118,000 42,496 $114,000 41,487 $111,000 41,487 $111,000 41,228 $111,000 39,397 $106,000 39,153 $105,000Collect sample of excavated area for confirmation.

Subtotal $386,000 $382,000 $369,000 $360,000 $360,000 $358,000 $342,000 $340,000Capping/Cover/Liner Soil Cover, 0.5 ft, Compacted $25 Cu Yd 218,923 $5,473,000 217,456 $5,436,000 205,448 $5,136,000 202,351 $5,059,000 202,351 $5,059,000 201,543 $5,039,000 189,614 $4,740,000 188,861 $4,722,000Orange snow fence demarcation layer $0.80 Sq Yd 1,313,540 $1,051,000 1,304,734 $1,044,000 1,232,689 $986,000 1,214,107 $971,000 1,214,107 $971,000 1,209,258 $967,000 1,137,684 $910,000 1,133,164 $907,000

Subtotal $6,524,000 $6,480,000 $6,122,000 $6,030,000 $6,030,000 $6,006,000 $5,650,000 $5,629,000Topsoil Cover & Revegetation

Offsite Topsoil Borrow, Hauling, & Placement, 6-in $28 Cu Yd 218,923 $6,130,000 217,456 $6,089,000 205,448 $5,753,000 202,351 $5,666,000 202,351 $5,666,000 201,543 $5,643,000 189,614 $5,309,000 188,861 $5,288,000

Sod and landscape - Residential Area $15.70 Sq Yd 788,124 $12,374,000 782,840 $12,291,000 739,614 $11,612,000 728,464 $11,437,000 728,464 $11,437,000 725,555 $11,391,000 682,610 $10,717,000 679,899 $10,674,000

Residential properties will be sodded and landscaped. Residential properties make up approximately 60% of the RES Area, based on square yards.

Seed and landscape - Residential Area $7.80 Sq Yd 525,416 $4,098,000 521,894 $4,071,000 493,076 $3,846,000 485,643 $3,788,000 485,643 $3,788,000 483,703 $3,773,000 455,074 $3,550,000 453,266 $3,535,000

Non-residential properties (school, church, park, industrial/commercial) will be seeded and landscaped. Non-residential properties make up approximately 40% of the RES Area, based on square yards.

Page 1 of 2


TABLE RES-2OU2 SOIL RES ALT 2: ON-SITE SOIL COVER + INSTITUTIONAL CONTROLS



Subtotal $22,602,000 $22,451,000 $21,211,000 $20,891,000 $20,891,000 $20,807,000 $19,576,000 $19,497,000Site Restoration and Final Survey

Incidental Site Clean-up/Restoration $2,000 property 140 $280,000 138 $276,000 135 $270,000 132 $264,000 132 $264,000 130 $260,000 127 $254,000 126 $252,000Includes 30 days of maintenance for each property

Final Residential Survey $2,000 Day 70 $140,000 69 $138,000 68 $135,000 66 $132,000 66 $132,000 65 $130,000 64 $127,000 63 $126,000Subtotal $420,000 $414,000 $405,000 $396,000 $396,000 $390,000 $381,000 $378,000

Contractor's Oversight, H&S, SurveyingContractor Health and Safety $25,000 Month 153 $3,818,000 152 $3,791,000 144 $3,592,000 141 $3,534,000 141 $3,534,000 141 $3,519,000 133 $3,317,000 132 $3,303,000Survey As-Builts $15,000 LS 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000Contractor Management and Oversight $40,000 Month 153 $6,109,000 152 $6,065,000 144 $5,747,000 141 $5,654,000 141 $5,654,000 141 $5,630,000 133 $5,307,000 132 $5,285,000Contractor Sub Contracted Quality Control $10,000 Month 153 $1,527,000 152 $1,516,000 144 $1,437,000 141 $1,413,000 141 $1,413,000 141 $1,407,000 133 $1,327,000 132 $1,321,000

Subtotal $11,469,000 $11,387,000 $10,791,000 $10,616,000 $10,616,000 $10,571,000 $9,966,000 $9,924,000

CONSTRUCTION SUBTOTAL $47,378,000 $47,074,000 $44,789,000 $44,143,000 $44,143,000 $43,969,000 $41,679,000 $41,523,000

ENGINEERING AND CONSTRUCTION MANAGEMENTOnsite Construction Quality Assurance $30,000 Month 153 $4,582,000 152 $4,549,000 144 $4,310,000 141 $4,240,000 141 $4,240,000 141 $4,222,000 133 $3,980,000 132 $3,964,000Design, Engin., Procurement, & Construction Management: 20% of Construction Cost $9,476,000 $9,415,000 $8,958,000 $8,829,000 $8,829,000 $8,794,000 $8,336,000 $8,305,000Construction Completion Report $40,000 LS 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000Subcontractor Bond 3% of Construction Cost $1,421,000 $1,412,000 $1,344,000 $1,324,000 $1,324,000 $1,319,000 $1,250,000 $1,246,000

ENGINEERING & CM SUBTOTAL $15,519,000 $15,416,000 $14,652,000 $14,433,000 $14,433,000 $14,375,000 $13,606,000 $13,555,000

CONSTRUCTION & ENGINEERING TOTAL $62,897,000 $62,490,000 $59,441,000 $58,576,000 $58,576,000 $58,344,000 $55,285,000 $55,078,000

OPERATIONS AND MAINTENANCEAnnual O&M Years 30 $15,634,000 30 $15,634,000 30 $15,634,000 30 $15,634,000 30 $15,634,000 30 $15,634,000 30 $15,634,000 30 $15,634,0005 Year Remedy Reviews Reviews 6 $777,000 6 $777,000 6 $777,000 6 $777,000 6 $777,000 6 $777,000 6 $777,000 6 $777,000

Net Present Value of O&M and Remedy Reviews (Interest Rate = 5%) $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000 $16,411,000

TOTAL CONSTRUCTION, ENGINEERING, AND O&M COST $79,308,000 $78,901,000 $75,852,000 $74,987,000 $74,987,000 $74,755,000 $71,696,000 $71,489,000

CONTINGENCY

Contingency 20 % of Project Cost $15,862,000 $15,780,000 $15,170,000 $14,997,000 $14,997,000 $14,951,000 $14,339,000 $14,298,000

TOTAL COST $95,170,000 $94,681,000 $91,022,000 $89,984,000 $89,984,000 $89,706,000 $86,035,000 $85,787,000

Page 2 of 2


TABLE RES-3OU2 SOIL RES ALT 3: SOIL EXCAVATION + ON-SITE CONSOLIDATION UNDER A SOIL COVER




Mobilization & Demobilization $250,000 LS 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000

Construction Surveying $2,000 Day 70 $140,000 69 $138,000 68 $135,000 66 $132,000 66 $132,000 65 $130,000 64 $127,000 63 $126,000Assume 2 properties per day to be surveyed prior to initiating remediation

Contractor Prepared Preconstruction Plans HASP $6,000 LS 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 SWPPP Plan $15,000 LS 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 Traffic Plan $10,000 LS 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 Work Plan $8,000 LS 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 Sampling Plan $6,000 LS 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000Pre-Design Sampling







Car/Gas $600.00 wk 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000Assume 4 FTE, 2 field teams, 10 hr/day, 2 hr/property sampled, for pre-remedial sampling labor

Per diem (hotel/food) $156.00 day 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000Assume 4 FTE, 2 field teams, 10 hr/day, 2 hr/property sampled, for pre-remedial sampling labor


CLP Shipping $250.00 wk 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000Assumes 10% of samples shipped to CLP for confirmation analysis, approximately 5 coolers per week


Clearing & Grubbing Tree and Brush Removal - Low Density $600 10,000 Sq Ft 1,182 $709,000 1,174 $705,000 1,109 $666,000 1,093 $656,000 1,093 $656,000 1,088 $653,000 1,024 $614,000 1,020 $612,000

Decontamination Area $10,000 LS 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000Includes materials, power, and water to operate decontamination area

Coordination with Residents $175 property 140 $25,000 138 $24,000 135 $24,000 132 $23,000 132 $23,000 130 $23,000 127 $22,000 126 $22,000

Perimeter Air Monitoring for Metals $31,460 Month 160 $5,020,000 159 $4,986,000 150 $4,711,000 147 $4,640,000 147 $4,640,000 147 $4,621,000 138 $4,348,000 138 $4,331,000Assume air monitoring to be performed during excavation only. Excavation rate of 100 cy/day

Subtotal $5,764,000 $5,725,000 $5,411,000 $5,329,000 $5,329,000 $5,307,000 $4,994,000 $4,975,000Contaminated Soil Excavation and Backfilling

Contaminated Soil Excavation & Temporary Stockpiling $6 Cu Yd 359,034 $2,154,000 356,627 $2,140,000 336,935 $2,022,000 331,856 $1,991,000 331,856 $1,991,000 330,530 $1,983,000 310,967 $1,866,000 309,732 $1,858,000 Assume 100 cy/day for soil excavation

Backfill - Offsite Borrow, Hauling, Placement & Compaction $30 Cu Yd 218,923 $6,568,000 217,456 $6,524,000 205,448 $6,163,000 202,351 $6,071,000 202,351 $6,071,000 201,543 $6,046,000 189,614 $5,688,000 188,861 $5,666,000Includes analytical testing of material. Assume backfill rate of 200 cy/day.

Confirmation Sampling & Analysis $2.68 Cu Yd 359,034 $964,000 356,627 $957,000 336,935 $904,000 331,856 $891,000 331,856 $891,000 330,530 $887,000 310,967 $835,000 309,732 $831,000 Collect sample of excavated area for confirmation.Subtotal $9,686,000 $9,621,000 $9,089,000 $8,953,000 $8,953,000 $8,916,000 $8,389,000 $8,355,000

Contaminated Soil Consolidation or Disposal

Onsite Hauling and Consolidation $4.5 Cu Yd 359,034 $1,616,000 356,627 $1,605,000 336,935 $1,516,000 331,856 $1,493,000 331,856 $1,493,000 330,530 $1,487,000 310,967 $1,399,000 309,732 $1,394,000 Soil transported to MIA Area for on-site consolidationSubtotal $1,616,000 $1,605,000 $1,516,000 $1,493,000 $1,493,000 $1,487,000 $1,399,000 $1,394,000

Capping/Cover/Liner

Low Permeability Clay Cover, 2 ft, Compacted $28 Cu Yd 6,744 $169,000 6,744 $169,000 6,744 $169,000 6,744 $189,000 6,744 $189,000 6,744 $189,000 6,744 $189,000 6,744 $189,000 Compacted clay for on-site consolidation area soil cover.

Geotextile Filter & Separator Fabric $3 Sq Yd 35,909 $90,000 35,669 $89,000 33,699 $84,000 33,191 $83,000 31,102 $78,000 33,059 $83,000 31,102 $78,000 30,978 $77,000Geotextile liner used to separate existing soil from consolidation area soil in MIA consolidation area.

Subtotal $259,000 $258,000 $253,000 $2,000 $2,000 $2,000 $2,000 $2,000Runoff Diversion & Erosion Control (Permanent)

Swales-Excavation & Grading $2.50 Sq Yd 1,478 $3,700 1,478 $3,700 1,478 $3,700 1,478 $3,700 1,478 $3,700 1,478 $3,700 1,478 $3,700 1,478 $3,700Assumes 6-ft wide swales around perimeter and down slope on each side of consolidation area

Erosion Control Mat (Slopes & Covers) $42.00 Sq Yd 34,431 $1,446,100 34,191 $1,436,000 32,221 $1,353,300 31,713 $1,331,900 31,713 $1,331,900 31,580 $1,326,400 31,580 $1,326,400 29,500 $1,239,000 Mat placed across entire consolidation area cover

Erosion Control Mat (Drainage Channels) $26.00 Sq Yd 1,217 $31,700 1,217 $31,700 1,217 $31,700 1,217 $31,700 1,217 $31,700 1,217 $31,700 1,217 $31,700 1,217 $31,700Assumes 6-ft wide channel at base of consolidation area around perimeter

Erosion Control Riprap-(Grad. No. 3 Quality B) $45 Cu Yd 406 $18,300 406 $18,300 406 $18,300 406 $18,300 406 $18,300 406 $18,300 406 $18,300 406 $18,300 Assume 1.0 ft of riprap in channelErosion Control Stone/Bedding (CA-2 or Grad. No. 1) $255 Cu Yd 406 $103,500 406 $103,500 406 $103,500 406 $103,500 406 $103,500 406 $103,500 406 $103,500 406 $103,500 Assume 1.0 ft of stone bedding in channel

Subtotal $1,603,300 $1,593,200 $1,510,500 $1,489,100 $1,489,100 $1,483,600 $1,483,600 $1,396,200

Page 1 of 2


TABLE RES-3OU2 SOIL RES ALT 3: SOIL EXCAVATION + ON-SITE CONSOLIDATION UNDER A SOIL COVER



Topsoil Cover & Revegetation

Offsite Topsoil Borrow, Hauling, & Placement $28 Cu Yd 219,042 $6,133,000 217,574 $6,092,000 205,567 $5,756,000 202,470 $5,669,000 202,470 $5,669,000 201,661 $5,647,000 189,733 $5,313,000 188,979 $5,291,000Includes both topsoil for residential properties (0.5 ft) and cover material for on-site consolidation area (1 ft)





Seeding - On-site consolidation area $1,000 Acre 7 $7,000 7 $7,000 7 $7,000 7 $7,000 7 $7,000 7 $7,000 6 $6,000 6 $6,000 Assume hydroseeding performed at 8900 sq yd/day. Subtotal $22,612,000 $22,461,000 $21,221,000 $20,901,000 $20,901,000 $20,818,000 $19,586,000 $19,506,000

Site Restoration and Final SurveyIncidental Site Clean-up/Restoration $2,000 property 140 $280,000 138 $276,000 135 $270,000 132 $264,000 132 $264,000 130 $260,000 127 $254,000 126 $252,000 Includes 30 days of maintenance for each propertyFinal Residential Survey $2,000 Day 70 $140,000 69 $138,000 68 $135,000 66 $132,000 66 $132,000 65 $130,000 64 $127,000 63 $126,000 Assume 2 properties per day to be surveyed

Subtotal $420,000 $414,000 $405,000 $396,000 $396,000 $390,000 $381,000 $378,000Contractor's Oversight, H&S, Surveying

Contractor Health and Safety $25,000 Month 183 $4,564,000 181 $4,534,000 171 $4,284,000 169 $4,220,000 169 $4,220,000 168 $4,203,000 158 $3,954,000 158 $3,939,000Survey As-Builts $15,000 LS 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000Contractor Management and Oversight $40,000 Month 183 $7,303,000 181 $7,254,000 171 $6,854,000 169 $6,751,000 169 $6,751,000 168 $6,724,000 158 $6,327,000 158 $6,302,000Contractor Sub Contracted Quality Control $10,000 Month 183 $1,826,000 181 $1,814,000 171 $1,714,000 169 $1,688,000 169 $1,688,000 168 $1,681,000 158 $1,582,000 158 $1,575,000

Subtotal $13,708,000 $13,617,000 $12,867,000 $12,674,000 $12,674,000 $12,623,000 $11,878,000 $11,831,000


ENGINEERING AND CONSTRUCTION MANAGEMENTOnsite Construction Quality Assurance $30,000 Month 183 $5,477,000 181 $5,441,000 171 $5,141,000 169 $5,063,000 169 $5,063,000 168 $5,043,000 158 $4,745,000 158 $4,726,000Design, Engin., Procurement, & Construction Management: 20% of Construction Cost $12,003,000 $11,928,000 $11,323,000 $11,116,000 $11,116,000 $11,073,000 $10,490,000 $10,434,000Subcontractor Bond 3% of Construction Cost $1,801,000 $1,789,000 $1,698,000 $1,667,000 $1,667,000 $1,661,000 $1,573,000 $1,565,000Construction Completion Report $40,000 LS 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000




Net Present Value of O&M and Remedy Reviews (Interest Rate = 5%) $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000


CONTINGENCY

Contingency 20 % of Project Cost $16,023,000 $15,923,000 $15,119,000 $14,848,000 $14,848,000 $14,792,000 $14,015,000 $13,943,000

TOTAL COST $96,138,000 $95,539,000 $90,715,000 $89,089,000 $89,089,000 $88,752,000 $84,089,000 $83,657,000

Page 2 of 2


TABLE RES-4OU2 SOIL RES ALT 4: SOIL EXCAVATION + OFF-SITE DISPOSAL




Mobilization & Demobilization $250,000 LS 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000 1 $250,000

Construction Surveying $2,000 Day 70 $140,000 69 $138,000 68 $135,000 66 $132,000 66 $132,000 65 $130,000 64 $127,000 63 $126,000Assume 2 properties per day to be surveyed prior to initiating remediation

Contractor Prepared Preconstruction Plans HASP $6,000 LS 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 SWPPP Plan $15,000 LS 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 Traffic Plan $10,000 LS 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 Work Plan $8,000 LS 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 1 $8,000 Sampling Plan $6,000 LS 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000 1 $6,000Pre-Design Sampling







Car/Gas $600.00 wk 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000 38.1 $23,000Assume 4 FTE, 2 field teams, 10 hr/day, 2 hr/property sampled, for pre-remedial sampling labor

Per diem (hotel/food) $156.00 day 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000 381 $60,000Assume 4 FTE, 2 field teams, 10 hr/day, 2 hr/property sampled, for pre-remedial sampling labor


CLP Shipping $250.00 wk 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000 38.1 $10,000Assumes 10% of samples shipped to CLP for confirmation analysis, approximately 5 coolers per week


Clearing & Grubbing Tree and Brush Removal - Low Density $600 10,000 Sq Ft 1,182 $709,000 1,174 $705,000 1,109 $666,000 1,093 $656,000 1,093 $656,000 1,088 $653,000 1,024 $614,000 1,020 $612,000

Decontamination Area $10,000 LS 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000 1 $10,000Includes materials, power, and water to operate decontamination area

Coordination with Residents $175 property 140 $25,000 138 $24,000 135 $24,000 132 $23,000 132 $23,000 130 $23,000 127 $22,000 126 $22,000

Perimeter Air Monitoring for Metals $31,460 Month 160 $5,020,000 159 $4,986,000 150 $4,711,000 147 $4,640,000 147 $4,640,000 147 $4,621,000 138 $4,348,000 138 $4,331,000Assume air monitoring to be performed during excavation only. Excavation rate of 100 cy/day

Subtotal $5,764,000 $5,725,000 $5,411,000 $5,329,000 $5,329,000 $5,307,000 $4,994,000 $4,975,000Contaminated Soil Excavation and Backfilling

Contaminated Soil Excavation & Temporary Stockpiling $6 Cu Yd 359,034 $2,154,000 356,627 $2,140,000 336,935 $2,022,000 331,856 $1,991,000 331,856 $1,991,000 330,530 $1,983,000 310,967 $1,866,000 309,732 $1,858,000 Assume 100 cy/day for soil excavationContaminated Soil Excavation & Temporary Stockpiling, Difficult Materials $9 Cu Yd - $0 - $0 - $0 - $0 - $0 - $0 - $0 - $0 Assume 100 cy/day for soil excavation

Backfill - Onsite Borrow, Placement & Compaction $15 Cu Yd - $0 - $0 - $0 - $0 - $0 - $0 - $0 - $0Includes analytical testing of material. Assume backfill rate of 200 cy/day.

Backfill - Offsite Borrow, Hauling, Placement & Compaction $30 Cu Yd 218,923 $6,568,000 217,456 $6,524,000 205,448 $6,163,000 202,351 $6,071,000 202,351 $6,071,000 201,543 $6,046,000 189,614 $5,688,000 188,861 $5,666,000Includes analytical testing of material. Assume backfill rate of 200 cy/day.

Confirmation Sampling & Analysis $2.68 Cu Yd 359,034 $964,000 356,627 $957,000 336,935 $904,000 331,856 $891,000 331,856 $891,000 330,530 $887,000 310,967 $835,000 309,732 $831,000 Collect sample of excavated area for confirmation.Subtotal $9,686,000 $9,621,000 $9,089,000 $8,953,000 $8,953,000 $8,916,000 $8,389,000 $8,355,000

Contaminated Soil Consolidation or DisposalOffsite Hauling and Disposal (non-hazardous) $90 Cu Yd 413,608 $37,225,000 410,835 $36,975,000 388,149 $34,933,000 382,298 $34,407,000 382,298 $34,407,000 380,771 $34,269,000 358,234 $32,241,000 356,811 $32,113,000Offsite Hauling and Disposal (RCRA hazardous) $150 Cu Yd 17,234 $2,585,000 17,118 $2,568,000 16,173 $2,426,000 15,929 $2,389,000 15,929 $2,389,000 15,865 $2,380,000 14,926 $2,239,000 14,867 $2,230,000 Soil that exceeds TCLP. Acceptance Sampling & Analysis $3.96 Cu Yd 430,841 $1,708,000 427,953 $1,696,000 404,322 $1,603,000 398,227 $1,579,000 398,227 $1,579,000 396,637 $1,572,000 373,160 $1,479,000 371,678 $1,473,000

Subtotal $41,518,000 $41,239,000 $38,962,000 $38,375,000 $38,375,000 $38,221,000 $35,959,000 $35,816,000Topsoil Cover & Revegetation

Offsite Topsoil Borrow, Hauling, & Placement, 6-in $28 Cu Yd 218,923 $6,130,000 217,456 $6,089,000 205,448 $5,753,000 202,351 $5,666,000 202,351 $5,666,000 201,543 $5,643,000 189,614 $5,309,000 188,861 $5,288,000





Subtotal $22,602,000 $22,451,000 $21,211,000 $20,891,000 $20,891,000 $20,807,000 $19,576,000 $19,497,000Site Restoration and Final Survey

Incidental Site Clean-up/Restoration $2,000 property 140 $280,000 138 $276,000 135 $270,000 132 $264,000 132 $264,000 130 $260,000 127 $254,000 126 $252,000 Includes 30 days of maintenance for each propertyFinal Residential Survey $2,000 Day 70 $140,000 69 $138,000 68 $135,000 66 $132,000 66 $132,000 65 $130,000 64 $127,000 63 $126,000 Assume 2 properties per day to be surveyed

Subtotal $420,000 $414,000 $405,000 $396,000 $396,000 $390,000 $381,000 $378,000

Page 1 of 2


TABLE RES-4OU2 SOIL RES ALT 4: SOIL EXCAVATION + OFF-SITE DISPOSAL



Contractor's Oversight, H&S, SurveyingContractor Health and Safety $25,000 Month 182 $4,557,000 181 $4,526,000 171 $4,276,000 168 $4,212,000 168 $4,212,000 168 $4,195,000 158 $3,947,000 157 $3,931,000Survey As-Builts $15,000 LS 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000 1 $15,000Contractor Management and Oversight $40,000 Month 182 $7,291,000 181 $7,242,000 171 $6,842,000 168 $6,739,000 168 $6,739,000 168 $6,712,000 158 $6,315,000 157 $6,290,000Contractor Sub Contracted Quality Control $10,000 Month 182 $1,823,000 181 $1,811,000 171 $1,711,000 168 $1,685,000 168 $1,685,000 168 $1,678,000 158 $1,579,000 157 $1,572,000

Subtotal $13,686,000 $13,594,000 $12,844,000 $12,651,000 $12,651,000 $12,600,000 $11,856,000 $11,808,000


ENGINEERING AND CONSTRUCTION MANAGEMENTOnsite Construction Quality Assurance $30,000 Month 182 $5,468,000 181 $5,432,000 171 $5,132,000 168 $5,054,000 168 $5,054,000 168 $5,034,000 158 $4,736,000 157 $4,717,000Design, Engin., Procurement, & Construction Management: 20% of Construction Cost $19,605,000 $19,478,000 $18,453,000 $18,187,000 $18,187,000 $18,116,000 $17,098,000 $17,033,000Subcontractor Bond 3% of Construction Cost $2,941,000 $2,922,000 $2,768,000 $2,728,000 $2,728,000 $2,717,000 $2,565,000 $2,555,000Construction Completion Report $40,000 LS 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000 1 $40,000




Net Present Value of O&M and Remedy Reviews (Interest Rate = 5%) $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000 $777,000


CONTINGENCYContingency 20 % of Project Cost $25,371,000 $25,208,000 $23,887,000 $23,544,000 $23,544,000 $23,453,000 $22,141,000 $22,057,000

TOTAL COST $152,227,000 $151,248,000 $143,323,000 $141,266,000 $141,266,000 $140,717,000 $132,848,000 $132,343,000

Page 2 of 2

ATTACHMENT 1

EXCERPT FROM DRAFT FS REPORT

(SECTION 2.4.2.1 – OU2 SOIL VOLUME CALCULATIONS)

Matthiessen and Hegeler Zinc Company Site February 2013 Draft Feasibility Study Report Revision 0

2013 0218 FS Report Draft Final All Sections 2-19

2.4.2.1 OU2 Soil Volume Calculations

The volume of soil to be addressed during the remedial action varies, depending on the alternatives developed and the final selected alternative. However, for the purposes of this Draft FS Report, the total volume of soil with analyte concentrations in excess of RALs (as presented in Table 2.3.2.2-1) has been calculated for each IA in OU2 for each of the three risk levels (1E-04, 1E-05, and 1E-06).

The soil volume calculations also consider the amount of soil that may be classified as non-hazardous or hazardous (by regulatory classification) for off-site disposal. Despite the discussion in Section 1.2.4, soil at OU2 is exempted from hazardous waste classification due to its source; however, an off-site disposal facility may still require the material to be treated as a hazardous waste if the material contains concentrations in excess of TCLP regulatory criteria. Therefore, although soil is not a listed hazardous waste, some of the soil may be a characteristically hazardous waste based on TCLP results. Waste that is characteristically hazardous will be disposed of as a Resource Conservation and Recovery Act (RCRA) hazardous waste in accordance with the ARARs, specifically 40 CFR Parts 260-268 and 35 IAC Parts 720-729.

During the RI, ten TCLP samples (five surface and five subsurface soil samples) were collected to assess the metals concentration levels that might require disposal as RCRA hazardous waste, in conjunction with potential remedial alternatives involving soil removal from the Site. The five TCLP sampling locations were selected at random in the MIA Area. The samples with analyte concentrations in excess of the TCLP regulatory limits were for cadmium and lead of 1 milligram per liter (mg/L) and 5 mg/L, respectively. Plots of the data were generated to illustrate total cadmium soil concentrations vs. TCLP cadmium concentrations (Figure 2.4.2.1-1) and total lead soil concentrations vs. TCLP lead concentrations (Figure 2.4.2.1-2). Regressions were performed to generate a “best fit” curve for each of the data sets, as shown on Figures 2.4.2.1-1 and 2.4.2.1-2.

Based on this very limited data set, the total cadmium TCLP threshold concentration in soil that may require disposal as RCRA hazardous waste is predicted to be approximately 40 mg/kg, and the total lead TCLP threshold concentration is predicted to be approximately 1,100 mg/kg. Based on the preliminary extrapolation of TCLP results for these samples, SulTRAC estimates that soil results containing total lead and cadmium concentrations in excess of these TCLP threshold values may exhibit characteristics of hazardous waste and require disposal as hazardous waste. Therefore, the OU2 cost estimate assumes that, depending on IA, between 15 and 60% of surface soil and between 0 and 25% of subsurface soil may have analyte concentrations that are in excess of TCLP concentrations for lead or cadmium. As discussed in Section 4.3, a pre-design investigation will be conducted during the RD as necessary to further refine the estimates of soil that would be considered characteristically hazardous for disposal purposes.

Figures 2.4.2.1-3 through 2.4.2.1-5, respectively, show the extent of shallow soil (0 to 2 ft bgs), excluding the RES Area, in which soil analyte concentrations were in excess of RALs at each of



the three risk levels (1E-04, 1E-05, and 1E-06). Figures 2.4.2.1-6 through 2.4.2.1-8, respectively, show the extent of subsurface soil (>2 ft bgs), excluding the RES Area, in which the soil analyte concentrations were in excess of RALs at each of the three risk levels (1E-04, 1E-05, and 1E-06).

These extents of contamination were drafted based on a comparison of the soil RALs and soil analytical results from the RI. In addition, each figure referenced in the preceding paragraph highlights the areas near B100 where soil may require additional consideration for PCBs with analyte concentrations in excess of RALs and the Toxic Substances Control Act (TSCA) regulatory limit of 50 mg/kg, as specified by ARAR 40 CFR Part 761. Soil with analyte concentrations that are anticipated to exceed the TSCA limit of 50 mg/kg of PCBs will be stockpiled separately and disposed of as a TSCA waste. The total area of the extent of shallow contamination for IAs 1 through 4 was multiplied by a depth of 2 feet to calculate the maximum volume of shallow contaminated soil. The volume of subsurface contaminated soil was calculated by multiplying the total area of the extent of subsurface contamination in each remedial action Area by the average depth where analyte concentrations were equal to or greater than the RALs in soil borings in that area. The soil volumes do not include contaminated soil beneath existing and structurally sound building foundations, which include the RM building, B100, 1943 Building, and off-site buildings. In addition, the soil volumes do not take changes in surface elevation into consideration, nor do the soil volumes consider other surface features, such as debris piles, construction/demolition (C/D) debris, etc. Table 2.4.2.1-1 lists the estimated soil volumes for each IA. Appendix S-1 includes detailed calculations on soil volumes for each IA.

During the RI, small amounts of asbestos in soil were detected at soil boring locations within the B100 Area, RM Area, and MIA Area. If bulk ACM is noted during the remedial action, the material will be stockpiled separately and disposed of as an ACM waste at an approved facility. Asbestos-contaminated soil and debris will be managed in accordance with 35 IAC Part 228.141 and 40 CFR Part 761. Stockpiled soil will be tested for asbestos as part of the disposal sampling.

During the RI, 194 out of 4,768 residential properties were sampled. The analytical results of the RI, compared to the RALs, are shown on Figures 2.4.2.1-9 through 2.4.2.1-11. In order to estimate the percentage of properties that may be potentially impacted, the off-site RES Area was divided into four zones, based on the density of the properties sampled during the RI. Each zone was subdivided by property type (residential, exempt [includes parks, churches, and schools], or industrial / commercial) and relative size (typical or large [properties greater than 100,000 ft2 for residential and 200,000 ft2 for exempt and commercial / industrial]). To estimate the total number of properties that may be potentially impacted, results from the RI were extrapolated within each zone by the percentage of properties sampled with analyte concentrations that were in excess of the RALs. The RI selected residential properties based on geographic distribution, and not based on property type or zone; therefore, a number of property types that have analyte concentrations greater than or equal to the RALs, result in a frequency of 0% (“exceedance” frequency). An alternate frequency was calculated using an average frequency

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for the geographic zone, regardless of property type, to address those instances with an “exceedance” frequency of 0%.

The residential areas were sampled for shallow soil (0 to 1 ft bgs) to evaluate human health risks from direct contact with surface soil. Based on the sampling depths and RES RI data concentrations greater than RALs, the depth of contamination is assumed to be 0.5 ft bgs for 60% of the RES Area properties and greater than 0.5 ft bgs or deeper for the remaining 40% of the RES Area properties. Although RES Area properties were sampled 0 to 1 ft bgs, considerations and assumptions must be made for greater depths as per EPA’s Superfund Lead-Contaminated Residential Sites Handbook (US EPA, 2003d). This handbook (US EPA, 2003d) indicates that soil should be removed to a minimum depth of 12 inches bgs at residential properties and 24 inches bgs in gardens. Since future locations of gardens are unknown, a maximum excavation depth of 24 inches bgs is assumed for each area, even areas that are currently not gardens. The RES Area soil with analyte concentrations in excess of RALs includes multiple COCs, including lead; therefore, the depths beyond 1 ft bgs were estimated to address potential risk from deeper contamination that was not sampled during the RI. The RES Area soil volume estimate assumes that, of the 40% of the greater than 6 inches bgs samples had analyte concentrations in excess of the RALs, approximately 50% of properties will have analyte concentrations in excess of RALs at 6 to 12 inches bgs, 40% of properties will have analyte concentrations in excess of RALs at 12 to18 inches bgs, and the remaining 10% will have analyte concentrations in excess of RALs at 18 to 24 inches bgs. Therefore, the proposed excavation depths for the RES Area are the following:

Depth (inches bgs)

Percent in excess of RALs

0-6 60% 6-12 20%

12-18* 16% 18-24* 4%

*These depths were not sampled during the RI and are estimated for depths greater than 12" bgs.

The average depth of excavation in the RES Area is estimated to be 0.82 ft bgs. A summary of the total volume of soil to be addressed in the RES Area is included in Table 2.4.2.1-1, and details supporting the estimate are included in Appendix S-1. The RES Area estimates are based on assumptions made from sample results from approximately 200 residences, collected and analyzed during the RI. These RES properties represent approximately 4% of the entire RES Area as outlined on Figures 2.4.2.1-9, 2.4.2.1-10, and 2.4.2.1-11. These RES Area sample results drive the soil volume calculations estimating the quantity of RES soil that would need to be excavated for each of the risk levels. There is uncertainty, as these soil volume calculations could change after more RES properties are sampled during the pre-design phase, necessitating calculation modifications to the estimated soil volumes that would need to be excavated. The actual number of impacted properties and the depth of impacted soil will be evaluated during the pre-design investigation, when additional properties are sampled.

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