STATE OF CONNECTICUT · 2020. 12. 2. · The State's Remediation Standard Regulations (Regulation...

STATE OF CONNECTICUT DEPARTMENT OF ENVIRONMENTAL PRO

SDMS DocID

Gallup's Quarry Federal National Priorities List Superfund Site Plainfield, Connecticut SnpprfiimJ^jcoitfs Center.

Ground Water Use and Value Determinat&JiTE: (Vfl.J/1/fc? BREAK: wv

Conclusions and Recommendations OTHER: ^l\^ The Connecticut Department of Environmental Protection has determined that all of the contaminated aquifer within the review area for the Gallup's Quarry NPL site on Tarbox Road in Plainfield, Connecticut, (including both the bedrock and overburden aquifers), is a Medium Use and Value Aquifer, based on the considerations presented in the attached Ground Water Use and Value Determination Document. The Connecticut Department of Environmental Protection has also determined that immediate restoration of the contaminated aquifer is not required. A ground water restoration time frame of up to 30 years is acceptable.

The Connecticut Department of Environmental Protection has undertaken this Ground Water Use and Value Determination pursuant to a Memorandum of Agreement dated March 14, 1997 between the Department and the US Environmental Protection Agency (EPA). This determination has been conducted in accordance with EPA's April 3, 1996 Ground Water Use and Value Determination Guidance Document.

CONNECprCUT DEPAR ENVIRQNMENTAX PRi

By Sidney J. Holbrook, Commissioner

( Printed on Recycled Paper)

79 Elm Street • Hartford, CT 06106 - 5127 An Equal Opportunity Employer

STATE OF CONNECTICUT DEPARTMENT OF ENVIRONMENTAL PROTECTION

BUREAU OF WATER MANAGEMENT PERMITTING, ENFORCEMENT & REMEDIATION DIVISION

FEDERAL REMEDIATION PROGRAM

Gallup's Quarry Federal National Priorities List Superfund Site Plainfield, Connecticut

Ground Water Use and Value Determination

Note: This document was prepared in accordance with EPA New England's Final Draft Ground Water Use and Value Determination Guidance, dated April 3, 1996. The data supporting this determination were compiled from the various sources listed in the references. No original data were collected by the Department in support of this effort.

The Review Area considered in this determination was defined initially by a two mile radius around the Gallup's Quarry site. The Use and Value Determination Guidance specifies that this initial two mile radius is a flexible guideline which can be expanded or contracted based on the hydrogeologic setting. The scope of the review area was contracted in some areas based on its hydrogeologic setting. The boundaries of the review area, and of the relevant drainage basins, are depicted in Figure 1. The boundaries of drainage basins were determined from the State's Atlas of Public Water Supply Sources and Drainage Basins of Connecticut (CTDEP, 1982).

The site is located within the Mill Brook Drainage Basin. Groundwater from the site flows in a generally westerly to northwesterly direction toward Mill Brook and its associated wetlands (ES&E, 1996). The Fry Brook Drainage Basin adjoins the northern side of the Mill Brook Drainage Basin. The mapped divide between these two basins nearest to the site is located in the wetland area to the northwest of the site, near the Plainfield sewage treatment plant. Because of the fiat, swampy topography in this area, the mapped location of this divide can be regarded as only approximate. For this reason, those portions of both the Mill Brook and Fry Brook Drainage Basins within a two mile radius of the site are included in the study area.

Overall Rating: Medium

The State has assigned a Medium overall Use and Value to the ground water within the review area for the Gallup's Quarry Superfund Site. This rating was determined through balancing the eight factors described in the EPA guidance document.

The site is located within a highly productive stratified drift aquifer, which provides ground water for three different water supply systems within the review area. These systems currently serve between 2,000 and 2,300 customers, and demand is expected to grow well into the 21st century. In addition, numerous private wells exist in the area.

Water quality classifications are depicted in Figure 2. The ground water classification for most of the area to the south, east and west of the site, as well as the site itself, is GA. This classification means the ground water is presumed to be suitable for direct human consumption without

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79 Elm Street • Htrtford. CT 06106 - 5127 An Equal Opportunity Employer

Gallup's Quarry NPL Site Preliminary Ground Water Use and Value Determination Page 2 of 10

treatment, and the State's goal is to maintain drinking water quality. Ground waters with a classification of GA are designated for use as existing private and potential public water supplies. The ground water classification for the northern portion of the Gallup's Quarry site, including the former Primary and Secondary Disposal Areas, was formerly GB/GA, indicating that the water may not have been considered suitable for direct human consumption without treatment (CTDEP, 1986). The State's goal was to restore the ground water to drinking water quality (CTDEP, 1992, p. 40). However, under the revised Ground Water Quality Standards which became effective on April 12, 1996, this dual classification has been eliminated. All areas which were formerly designated as GB/GA are now classified as GA. The GA classification signifies that the ground water is presumed to be of natural quality and suitable for drinking without treatment (CTDEP, 1996, p. 27).A notation will be made in the State's ground water quality maps indicating that this assumption is not currently true in former GB/GA areas. Water quality in the remainder of the review area has retained its GA classification (CTDEP, 1993). The State's goal of maintaining or restoring the ground water in GA areas to natural quality remains unchanged (CTDEP, 1996, p. 22).

Connecticut's Water Quality Standards are an important element of Connecticut's EPA endorsed Core Comprehensive State Ground Water Protection Program. The ground water classifications assigned under these standards have been derived through careful consideration of many of the same factors addressed in EPA's Ground-water Use and Value Determination Guidance. A hierarchy of designated uses is included for each ground water classification. The ground water classifications therefore represent, hi effect, the State's determination regarding the use and value of the ground water.

The State's Remediation Standard Regulations (Regulations of Connecticut State Agencies, Sections 22a-133k-l to 3, 22a-133q-l, and 22a-209-l) were adopted in January 1996. These provide specific numerical criteria for remediation of a wide range of pollutants in soils and ground water. It is important to note that the requirements of these regulations will apply to any remedy which is selected at this site. These regulations establish numeric criteria for various contaminants based on the ground water classification.

1. Quantity: High

The site is within an area of relatively thick, saturated stratified drift extending from Lillibridge Road north through the site and into the Fry Brook and Horse Brook Valleys, in the central portion of the Mill Brook Basin. Boring logs of wells and test borings drilled during the remedial investigation generally confirmed that stratified drift in the area is underlain by glacial till and crystalline bedrock. The southeastern portion of the site is a till/ bedrock hill, and stratified drift was not noted hi this area. The saturated thickness of the stratified drift generally increases moving northwesterly from this hill toward Mill Brook (ES&E, 1996, p. 3-14). Mapping of the


piezometric surface conducted as part of the Remedial Investigation suggests that Mill Brook is a gaining stream in this area (ES&E, 1996, p. 3-19). Stratified drift thicknesses ranged from zero to approximately 70 feet (ES&E, 1996, p. 3-6). The US Geological Survey has identified this area as a major stratified drift aquifer (Melvin and others, 1995, p. 17). Randall and others (1966, p. 85-90) identified this aquifer as one of 29 within the Quinebaug River Basin that is especially favorable for ground water development. They estimated the long term yield for this aquifer to be 2.3 million gallons/day. The Gallup Water Service Company's well field is located approximately 0.75 miles north-northwest of the site, and is currently withdrawing an estimated 0.3 to 0.4 million gallons/day from this aquifer (Melvin and others, 1995, p. 8).

2. Quality: Medium

The site is approximately one mile south of the down town portion of Plainfield. An industrial park is located to the north of the site, on the opposite side of Mill Brook. The Intermark Fabric Corporation (formerly the Pervel Industries Flock Plant) and a Safety Kleen Corporation waste accumulation facility are located within this industrial park. The Safety Kleen facility was formerly owned by Pervel. Documented releases of chlorinated solvents are known to the Department to have occurred at the former Pervel Flocking Plant. The area of downtown Plainfield is heavily urbanized and industrialized, with numerous documented sources of contamination. The areas to the south, east and west are predominantly rural or suburban and have only a few minor documented releases. •

Ground water quality classifications within the study area are depicted in Figure 2. The Department has assigned a ground water quality classification of GB to most of the urbanized area to the north of the site (CTDEP, 1986).This classification is assigned to ground water within highly urbanized areas or areas of intense industrial activity where public water supply service is available. The water may not be suitable for direct human consumption without treatment due to waste discharges, spills, and leaks of chemicals or due to land use impacts (CTDEP, 1992, p. 41). The Department's goal is to prevent further degradation by preventing any further discharges which would cause irreversible contamination.

A large mill building is located within the GB area, approximately one half mile north northeast of the former Primary and Secondary Disposal Areas. This building formerly housed the InterRoyal Company, and the main plant of Pervel Industries, a manufacturer of coated fabrics. Currently this building houses several tenants. Widespread contamination is known to the Department to exist on this site as a result of past operations of Pervel and InterRoyal. The Department considers this site to be a major source of contamination. The Town of Plainfield's waste water treatment facility is located approximately one quarter mile northwest of the former Primary and Secondary Disposal Areas, near the junction of Mill Brook and Frye Brook. After tertiary treatment, waste water from this plant is discharged to Mill Brook, downstream from


Gallup's Quarry. The average daily flow through this plant is approximately 0.55 million gallons/day, with peak discharges approaching the design capacity of 0.75 million gallons/day (Melvin and others, 1995, p. 14). The area served by this facility is similar in extent to the Gallup's Water Service Company's service area. The sewage treatment plant as well as most of downtown Plainfield, including the former Pervel Flock Plant and Main Plant, are located in the Fry Brook Drainage Basin.

Most of the rural and suburban area to the south, east, and west has a ground water quality classification of GA (CTDEP, 1986). This classification is assigned to ground waters within the area of influence of private or potential public water supplies. The ground water is presumed to be suitable for direct human consumption without treatment. The State's goal is to maintain drinking water quality.

The areas within approximately a 500 foot radius surrounding the well fields for each of the three public water supply systems within the study area have been assigned a ground water quality classification of GAA (CTDEP, 1986). This classification is assigned to waters which are tributary to public water supply watersheds or within the area of influence of community or non-community water supply wells. The State's goal is to maintain drinking water quality.

The three local water companies are required to monitor water quality in their wells on a regular basis and to submit the results of this monitoring to the Water Supplies Section of the Connecticut Department of Public Health. This monitoring has shown that water quality in all three systems has usually met the requirements of the Connecticut Public Health Code (Vicky Carrier, Connecticut Dept. of Public Health, Water Supplies Section, written commun., 1996). In 1993, an exeedance of Maximum Contaminant Levels for lead and copper was reported in the Brookside Water Company system. Seasonal pH adjustment was implemented to correct this problem, and no further exceedances have been reported. Melvin and others (1995, p. 8) reported that during the past ten years some customers of the Glen Acres Water Company have installed private wells due to high iron and manganese levels in the public water supply. To correct this problem, the company installed a 440 foot deep bedrock well in November, 1995 (Vicky Carrier, Connecticut Dept. of Public Health, Water Supplies Section, written commun., 1996).

The northern portion of the site itself, including the former Primary and Secondary Disposal Areas and the former Seepage Bed, formerly had ground water quality classification of GB/GA (CTDEP, 1986). However, under the revised Ground Water Quality Standards which became effective on April 12,1996, this dual classification has been eliminated. All areas which were formerly designated as GB/GA are now classified as GA. This does not indicate that the contamination in the area has been eliminated. The water quality classification map for former GB/GA areas will continue to note that water quality in the area is degraded, until the State's goal of restoring natural ground water quality has been achieved. The GA classification signifies


that the ground water is presumed to be of natural quality and suitable for drinking without treatment (CTDEP, 1996, p. 27), Water quality in the remainder of the review area has retained its GA classification (CTDEP, 1986).

3. Current Public Water Supply Systems: High

Two public water supply well fields are located within the Review Area (CTDEP, 1982), while one additional system, the Glen Acres Water Company, is located immediately adjacent to the review area in the Quinebaug River Drainage Basin. The locations of these well fields are depicted in Figure 3. In addition, wells serving the Westview Terrace Mobile Home Park and the Cemetery Road Apartments are located near the northern edge of the review area. The Hilldale Water Company well field is located on the northern boundary of the review area.

The Gallup Water Service Company's well field is located approximately 0.75 miles north-northwest of Gallup's Quarry. According to the most recent sanitary survey performed in May 1995 by the Connecticut Department of Public Health, (Vicky Carrier, Connecticut Dept. Of Public Health, Water Supplies Section, written commun., 1996), this system has approximately 550 service connections and is estimated to serve approximately 2,200 persons. The system's two gravel pack wells currently produce 300,000 to 400,000 gallons of water per day, operating between 5 and 6 hours per day at an average flow rate of 1,000 gallons per minute (Melvin and others, 1995). According to the Health Department's sanitary survey, one of the two wells is currently inactive. The well head protection area for this system has been mapped on a preliminary level under the Department of Environmental Protection's Aquifer Protection Program. The closest boundary of the initial aquifer protection setback area as mapped by Lenard Engineering Inc. (undated) is approximately 1000 feet north of Gallup's Quarry. The location of the setback area is depicted in-Figure 3. Detailed mapping of actual contribution areas is planned but has not yet been completed (Corinne Fitting, Connecticut Dept. of Environmental Protection, Water Management Bureau, Planning and Standards Division, oral commun., 1996). It is expected that the final boundaries of the aquifer protection area will be smaller than the initial setback area when detailed mapping is completed. The service area of this system is primarily within the downtown area of Plainfield and the adjacent areas.

The two dug wells of the Brookside Water Company are located approximately one mile northeast of the northern portion of Gallup's Quarry. According to the most recent Department of Public Health Sanitary Survey, which was completed in May 1995, this system has 229 service connections and serves an estimated 802 people (Vicky Carrier, Connecticut Dept. of Public Health, Water Supplies Section, written commun., 1996). This system primarily serves a subdivision on the eastern side of Interstate 395, to the east-northeast of the site (Melvin and others, 1995, page 9). These two wells have current long term yields of approximately 45 gallons per minute, with a total average demand in 1993 of 33,500 gallons per day (Lenard Engineering,


1994). Aquifer protection mapping has not been completed for this system. The requirements of Connecticut's Aquifer Protection Program do not apply to water systems with less than 1,000 customers.

The Glen Acres Water Company well field is located on Lillibridge Road, approximately 0.4 miles west of Gallup's Quarry. The supply for this system consists of three drilled wells, one with a depth of 72 feet, the other with a depth of 64 feet, and the third with a depth of 440 feet. According to the most recent Department of Public Health Sanitary Survey, which was completed in May 1995, this system has 36 service connections, and serves a total estimated population of 144 people. The service area for this water system is located along Tarbox Road and Lillibridge Road. An average of approximately 6,000 gallons of water per day are withdrawn by this system. Aquifer protection area mapping has not been completed for this system. Gallup Water Service, Inc. recently took over operation of this utility, which is now known as the Gallup Water Service, Lillibridge Division. Due to high levels of iron in the two shallow wells, the utility installed the 440 foot deep bedrock well in November 1995. This well is located approximately 80 feet away from the two previously existing wells. Its measured yield is approximately 15 gallons/minute (Vicky Carrier, Connecticut Dept. of Public Health, Water Supplies Section, written commun., 1996). The deeper well was recently placed in service and now serves as the primary water source for this system. The two more shallow wells will be retained as backup sources.

The Plainfield Greyhound Park is located approximately 3,500 feet southeast of the northern portion of the site. This facility is served by three wells (CTDEP, 1982).

Previous studies (Fuss & O'Neill, Inc., 1979; Melvin and others, 1995), as well as the Remedial Investigation recently completed by ES& E (1996) indicate that ground water flow from the site is northwesterly to northeasterly toward Mill Brook. Melvin and others (1995, p.24) noted that although Mill Brook appears to be the discharge point for ground water flowing from the Gallup's Quarry area, "the possibility of deeper regional flow, in which water in the crystalline bedrock flows beneath the Mill Brook drainage divide toward the Quinebaug River, although small, cannot be excluded". Several shallow overburden wells were installed on the opposite side of Mill Brook from the site. Ground water flow in these wells was toward Mill Brook. No bedrock wells were installed on the opposite side of Mill Brook as part of the Remedial Investigation.

Water quality in all of these community water systems is monitored on a regular basis and the results are reported to the Connecticut Department of Public Health. No site related contaminants have been detected in water samples collected from these wells (Vicky Carrier, Connecticut Dept. of Public Health, Water Supplies Section, written commun., 1996). The preliminary aquifer protection mapping performed for the Gallup Water Service Company suggests that site


contaminants do not pose a threat to this well field. Available hydrogeologic information suggests that neither the Brookside Water Company well field nor the Glen Acres Water Company well field are located in the down gradient direction from the site. However, the areas of contribution for these well fields have not been mapped.

4. Current Private Drinking Water Supply Wells: Medium

The area immediately surrounding the site is not served by public water. Numerous private wells exist in the area. Water samples were collected from 10 private wells in 1989 by Roy F. Weston, Inc. (1989) under contract to EPA. Low concentrations of volatile organic compounds, semi-volatile organic compounds, and metals, all below Maximum Contaminant Levels (MCLs), were detected in several wells. Weston sampled 8 additional wells in 1993. Again, no contaminants exceeding MCLs were detected.

The regional ground water flow in the area is toward the northwest in the direction of Mill Brook, and its associated wetlands. This area is unoccupied, and private wells would not be expected hi this area. The populated areas father to the north and west, on the far side of Mill Brook, are within the service area of the Gallup Water Service Company. The residential wells in the immediate vicinity of the site are concentrated to the east and south along Route 12, and to the immediate southwest, along Tarbox Road. These residential areas do not appear to be down gradient from the site, and do not appear to be threatened by site-related ground water contaminants. A number of private wells in the area were sampled by ES&E (1996) as part of the Remedial Investigation. No site related contaminants were detected.

The northeastern extent of the Glen Acres Water Company's service area terminates just to the west of the site, on Tarbox Road. However, no information is available to indicate whether this system would have sufficient excess capacity to be extended to accommodate additional customers. The Gallup Water Company's service area terminates approximately 1/4 mile north of the northern portion of Gallup's Quarry, along Route 12. The closest portion of the Brookside Water Company service area is approximately 3/4 mile north of the northern portion of the site, on the opposite side of Interstate 395 (ES&E, 1996).

5. Likelihood and Identification of Future Drinking Water Use: Medium

The Gallup Water Company Water Supply Plan (Lenard Engineering, Inc., 1994) projects that the total number of service connections in its system will increase from 568 in 1993 to 708 in 1998 to 1044 in 2010, and 1564 in 2040. Average daily usage is projected to increase from 271,000 gallons/day in 1993 to 355,000 gallons per day in 1998, to 529,000 gallons/day in 2010, to 735,000 gallons per day in 2040. Most of this projected growth is due to the company's plans to gradually increase the size of its service area. The company projects that it can meet this


increased demand by adding storage tanks to the system. The estimated available supply is 1.08 million gallons/day. No additional wells are expected to be required within the next 50 years. Since the supply wells are currently operating an average of 5 to 6 hours per day (Melvin and others, 1995, p. 8), it is presumed that some of the projected increase in demand could be met by increased withdrawals from the existing wells.

The Water Supply Plan for the Brookside Water Company (Lenard Engineering, Inc., 1994) projects that the total number of service connections will increase from 202 in 1993 to 235 in 1998 to 267 in 2010, with no further growth forecast beyond that time. The estimated available supply is 75,600 gallons/day. Average daily demand is projected to increase from 33,500 gallons in 1993 to 39, 900 gallons in 1998 to 46,500 gallons per day in 2010. This expected increase is due to planned expansion of the service area. Possible future improvements to the system include a new well within 20 years. The plan does not specify the size or location of the future well.

No information is available regarding future consumption or supply trends for the Glen Acres Water Service Company.

6. Other Current or Reasonably Expected Ground Water Uses in Review Area: Medium

The area to the south and west is rural, with some agricultural land use. Since this area is not served by a public water supply, any future agricultural or industrial users in this area would be expected to use ground water. These possible future uses do not appear to be threatened by on-site contaminants. The Remedial Investigation conducted by ES&E (1996) indicates that the ground water contaminant plume from the site is moving toward the northwest in the direction of Mill Brook.

7. Ecological Value: Medium

On-site ground water contributes a portion of hydrologic support to the wetlands adjacent to the Mill Brook. ES&E (1995) mapped wetlands on the site and hi the surrounding area. Most of the wetlands identified are associated with Mill Brook and its tributaries. No extensive wetlands were identified within the boundaries of Gallup's Quarry. The wetlands associated with Mill Brook extend into a small portion of the northeastern section of the property, to the east of the former Primary and Secondary Disposal Areas.

The U.S. Fish and Wildlife Service performed a habitat characterization survey of the site in 1993 (ES&E, 1995). They noted that the site was highly disturbed due to past excavation and industrial activity. No unusual plant or animal species were identified within the site.

No ecological risk assessment has been performed at this site to date.


Three areas included in the Department's Natural Diversity Database are located within the study (ConnDEP, 1995). All of these are located to the north of Gallup's Quarry. A State Species of Special Concern, Ambystoma laterale, (blue spotted salamander complex), occurs in this area. This population is a hybrid between the blue spotted salamander and a related species. Ambystoma laterale (blue spotted salamander) also occurs within the study area as a non-hybridized population. This is a State Threatened species. A Federal and State Endangered plant species, Agalinus acuta (sand plain gerardia), also occurs within the study area. Although these species have not been documented on the site, the salamanders could migrate to the site (Dawn M. McKay, Connecticut Dept. of Environmental Protection, Natural Resources Center, written commun., 1996). The general locations of these areas are shown in Figure 4. ES&E (1996, p.320) found that the wetland area bordering the southwestern portion of the site is a white cedar swamp. Several other white cedar swamps within the area are included on the State's Natural Resources Diversity Database. No threatened or endangered species were noted within the site boundaries by ES&E.

8. Public Opinion: Medium

Minimal feed back has been received from the public regarding the use and value of the ground water at this site, or any other issues regarding the Gallup's Quarry site. The Department held public hearings in 1981 when the ground water quality goals were established for this area. The records for this hearing, and for subsequent revisions hi 1986 show that no input was received from the Town of Plainfield or its citizens. The Department provided ample opportunity for comment during both the hearings and the regional workshops which preceded the hearings. During the past four years the Department's Project Manager for the Gallup's Quarry Superfund site has received few citizen inquiries regarding the site.

References

Connecticut Department of Environmental Protection, 1986, Water Quality Classification Map of the Thames, Southeast Coast and Pawcatuck River Basins. 2 blue line sheets.

Connecticut Department of Environmental Protection, 1992, Water Quality Standards, Adopted January 1992, Effective May 15, 1992, 68 pages.

Connecticut Department of Environmental Protection, 1995, Natural Resources Diversity Database Map of the Plainfield Quadrangle. Unpublished 1:24,000 scale map on file at the Connecticut Department of Environmental Protection Natural Resources Center, Hartford, Connecticut.

Connecticut Department of Environmental Protection, 1996, Water Quality Standards, Surface


Water Quality Standards Effective May 15, 1992, Ground water Quality Standards Effective April "12, 1996,49 pages.

Environmental Science and Engineering, Inc. (ES&E), 1995, Gallup's Quarry Superfund Project, Plainfield, Connecticut, Initial Site Characterization Report- Phase 1 A. Unpublished report, 5 volumes.

Environmental Science and Engineering, Inc. (ES&E), 1996, Gallup's Quarry Superfund Project, Plainfield, Connecticut, Remedial Investigation Report - Phase 1 A. Unpublished report, 9 volumes, 2nd revision dated October 22,1996.

Lenard Engineering, Inc., 1994, Water Supply Plan Prepared for Gallup Water Service, Including: Gallup Water Service, Brookside Water Company, Country Mobile Estates. Storrs, Connecticut, Lenard Engineering, Inc., 1 loose leaf volume, on file with Connecticut Department of Environmental Protection, Water Management Bureau, Planning and Standards Division.

Lenard Engineering, Inc., undated, Map of Gallup Water Company Wells 1 & 2 Level B Aquifer Protection Areas. Storrs, Connecticut, Lenard Engineering, Inc., 2 sheets, on file with Connecticut Department of Environmental Protection, Water Management Bureau, Planning and Standards Division.

Melvin, R.L., Stone, J.R., Craft, P. A., and Lane, J.W., Geohydrology of the Gallup's Quarry Area, Plainfield, Connecticut: U.S. Geological Survey Water Resources Investigations Report 93-4138.

Randal, A.D., Thomas, M.P., Thomas, C.E., Jr., and Baker, J.A., 1966, Water Resources Inventory of Connecticut, Part 1, Quinebaug River Basin: Connecticut Water Resources Bulletin 8, Prepared by the US Geological Survey in Cooperation with the Connecticut Water Resources Commission, 102 p.

Roy F. Weston, Inc., 1989, Residential Drinking Water Sampling, Gallup Quarry Site, Plainfield, Connecticut, January 23-24, 1989. Prepared for U.S. Environmental Protection Agency by Roy F. Weston, Inc., Technical Assistance Team. 1 bound volume.

US Environmental Protection Agency, 1995, Draft Groundwater Use and Value Determination Guidance. EPA New England, Boston, MA, draft document dated August 31,1995, 31 pages.

Figure 1 Gallup's Quarry Federal Superfund Site Groundwater Use And Value Determination Study Area Location

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Study Area Drainage Divide

Figure 2 Gallup's Quarry Federal Superfund Site Groundwater Use And Value Determination State Surface and Ground Water Classification

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Figure 3 Gallup's Quarry Federal Superfund Site Groundwater Use And Value Determination Public Water Supply Wells and Level B Aquifer Protection Areas

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Figure 4 Gallup's Quarry Federal Super-fund Site Groundwater Use And Value Determination Areas of Ecological Value

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Source: Natural Diversity Data Base Natural Resources Center, CT DEP

Study Area Areas of Ecological Value

STATE OF CONNECTICUT · 2020. 12. 2. · The State's Remediation Standard Regulations (Regulation...

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