March 11, 2016 Portland Public Schools Andy Fridley 501 N. Dixon Street Portland, Oregon 97227 Re: Phase 2 Schools Soil Sample Report Harriet Lane, Lewis, Green Thumb, Boise Eliot, Humboldt, Rose City Park Portland, Oregon PBS Project No. 6500.638 Dear Mr. Fridley: On Tuesday, March 8, 2016, PBS Engineering and Environmental, Inc. (PBS) collected soil samples at six different Portland Public School facilities. These schools included Lane Middle School, Lewis School, Boise Eliot School, Humboldt School, and Rose City Park (Access Academy) and CTP Green Thumb. Soil samples were collected by scraping exposed soils with a gloved hand into a sample container. The samples were submitted to Apex Laboratories of Tigard, Oregon under chain of custody documentation. All samples were analyzed for cadmium, arsenic and hexavalent chromium. The samples collected from Lane Middle School, Lewis School, and Green Thumb were analyzed for nickel as well. The below table summarizes the findings of these tests. Data includes laboratory results and the background concentrations for arsenic (As), Cadmium (Cd) and nickel (Ni). DEQ does not have a published background hexavalent chromium (Cr VI) concentration for the Portland Basin. Table 1. Soil Sample Results

Location Arsenic As Back* Cadmium Cd Back* Chromium VI

Cr VI ATSDR**

Nickel Ni Back*

Lane 7.38 8.8 0.267 0.63 ND 45 12.5 47

Lewis 5.02 8.8 0.298 0.63 ND 45 19.7 47 Green Thumb

3.60 8.8 0.393 0.63 ND 45 14.5 47

Boise Eliot 3.29 8.8 0.261 0.63 ND 45 NT NA Humboldt 2.74 8.8 0.456 0.63 ND 45 NT NA Rose City 4.26 8.8 0.313 0.63 ND 45 NT NA All results are presented in milligrams per kilogram which is equivalent to parts per million (ppm) ND None Detected NT Not Tested NA Not Applicable *Concentrations for the Portland Basin were obtained from DEQs Background Levels of Metals in Soils for Cleanups 3/20/2013 **ATSDR Guideline value used in DEQs Bullseye Glass Area-Wide Soil Sampling Report, March 2016

Portland Public Schools Phase 2 Metals in Soil Testing Report March 11, 2016 Page 2

It should be noted that the Cr VI detection limit for this analysis ranged from 1.32 ppm to 98.9 ppm due to soil interferences with the laboratory analyses. Based upon review of the laboratory data, metals concentrations in these samples were very low. There are no obvious indications that soil conditions at these six different test sites present an unusual exposure risk with respect to metals contamination. The results of these tests were all below the Portland Basin average concentrations for arsenic, cadmium and nickel as presented in DEQs recent soil testing report for the SE Portland neighborhood surrounding Bullseye Glass. If you have any questions, please contact me at your convenience. Sincerely, PBS Engineering and Environmental Inc. Douglas Hancock CIH CSP Attachment: Laboratory Results DH:bmp

12232 S.W. Garden Place

Tigard, OR 97223

503-718-2323 Phone

503-718-0333 Fax

Apex Labs

PBS Engineering and Environmental

RE: PPS Metals Project / 6500.638

Portland, OR 97239

4412 SW Corbett Ave

Doug Hancock

Enclosed are the results of analyses for work order A6C0319, which was received by the laboratory on

3/8/2016 at 4:17:00PM.

Thank you for using Apex Labs. We appreciate your business and strive to provide the highest quality

services to the environmental industry.

If you have any questions concerning this report or the services we offer , please feel free to contact me

by email at: ldomenighini@apex-labs.com, or by phone at 503-718-2323.

Thursday, March 10, 2016

DRAFT REPORT, DATA SUBJECT TO CHANGE

DRAFT REPORT The results provided in this report are PRELIMINARY and are subject to change based on subsequent analysis, QC validation or final data review. Please use these results with

the understanding that they may have not been finalized by the laboratory

Page 1 of 10

Apex Labs12232 S.W. Garden Place

Tigard, OR 97223

503-718-2323 Phone

503-718-0333 Fax

Portland, OR 97239 03/10/16 16:31Doug Hancock

4412 SW Corbett Ave

PBS Engineering and Environmental

Reported:

Project Manager:

Project Number:

PPS Metals ProjectProject:

6500.638

ANALYTICAL REPORT FOR SAMPLES

SAMPLE INFORMATION

Sample ID Laboratory ID Matrix Date Sampled Date Received

A6C0319-01 03/08/16 13:00 03/08/16 16:171 Humboldt Soil

A6C0319-02 03/08/16 13:00 03/08/16 16:172 Boise Soil

A6C0319-03 03/08/16 13:00 03/08/16 16:173 Rose City Soil

A6C0319-04 03/08/16 13:00 03/08/16 16:174 Lane Soil

A6C0319-05 03/08/16 13:00 03/08/16 16:175 Lewis Soil

A6C0319-06 03/08/16 13:00 03/08/16 16:176 Green Thumb Soil

DRAFT REPORT, DATA SUBJECT TO CHANGE

DRAFT REPORT The results provided in this report are PRELIMINARY and are subject to change based on subsequent analysis, QC validation or final data review. Please use these results with

the understanding that they may have not been finalized by the laboratory

Page 2 of 10

Apex Labs12232 S.W. Garden Place

Tigard, OR 97223

503-718-2323 Phone

503-718-0333 Fax

Portland, OR 97239 03/10/16 16:31Doug Hancock

4412 SW Corbett Ave

PBS Engineering and Environmental

Reported:

Project Manager:

Project Number:

PPS Metals ProjectProject:

6500.638

ANALYTICAL SAMPLE RESULTS

Total Metals by EPA 6020 (ICPMS)

ResultAnalyte Limit

Reporting

Method Notes DilutionUnitsMDL Date Analyzed

Matrix: Soil2 Boise (A6C0319-02)

Batch: 6030265

Arsenic EPA 6020Amg/kg dry 03/10/16 11:15103.29 --- 1.31

Cadmium "" " "0.261 --- 0.261

Matrix: Soil3 Rose City (A6C0319-03)

Batch: 6030265

Arsenic EPA 6020Amg/kg dry 03/10/16 11:18104.26 --- 1.57

Cadmium "" " "0.313 --- 0.313

Matrix: Soil4 Lane (A6C0319-04)

Batch: 6030265

Arsenic EPA 6020Amg/kg dry 03/10/16 11:21107.38 --- 1.16

Cadmium "" " "0.267 --- 0.233

Nickel "" " "12.5 --- 1.16

Matrix: Soil5 Lewis (A6C0319-05)

Batch: 6030265

Arsenic EPA 6020Amg/kg dry 03/10/16 11:23105.02 --- 1.49

Cadmium "" " "0.298 --- 0.298

Nickel "" " "19.7 --- 1.49

Matrix: Soil6 Green Thumb (A6C0319-06)

Batch: 6030265

Arsenic EPA 6020Amg/kg dry 03/10/16 11:27103.60 --- 1.51

Cadmium "" " "0.393 --- 0.302

Nickel "" " "14.5 --- 1.51

DRAFT REPORT, DATA SUBJECT TO CHANGE

DRAFT REPORT The results provided in this report are PRELIMINARY and are subject to change based on subsequent analysis, QC validation or final data review. Please use these results with

the understanding that they may have not been finalized by the laboratory

Page 3 of 10

Apex Labs12232 S.W. Garden Place

Tigard, OR 97223

503-718-2323 Phone

503-718-0333 Fax

Portland, OR 97239 03/10/16 16:31Doug Hancock

4412 SW Corbett Ave

PBS Engineering and Environmental

Reported:

Project Manager:

Project Number:

PPS Metals ProjectProject:

6500.638

ANALYTICAL SAMPLE RESULTS

Percent Dry Weight

ResultAnalyte Limit

Reporting

Method Notes DilutionUnitsMDL Date Analyzed

Matrix: Soil1 Humboldt (A6C0319-01) Batch: 6030289

% Solids EPA 8000C% by Weight 03/10/16 08:08157.8 --- 1.00

Matrix: Soil2 Boise (A6C0319-02) Batch: 6030289

% Solids EPA 8000C% by Weight 03/10/16 08:08177.5 --- 1.00

Matrix: Soil3 Rose City (A6C0319-03) Batch: 6030289

% Solids EPA 8000C% by Weight 03/10/16 08:08165.9 --- 1.00

Matrix: Soil4 Lane (A6C0319-04) Batch: 6030289

% Solids EPA 8000C% by Weight 03/10/16 08:08186.5 --- 1.00

Matrix: Soil5 Lewis (A6C0319-05) Batch: 6030289

% Solids EPA 8000C% by Weight 03/10/16 08:08166.8 --- 1.00

Matrix: Soil6 Green Thumb (A6C0319-06) Batch: 6030289

% Solids EPA 8000C% by Weight 03/10/16 08:08166.6 --- 1.00

DRAFT REPORT, DATA SUBJECT TO CHANGE

DRAFT REPORT The results provided in this report are PRELIMINARY and are subject to change based on subsequent analysis, QC validation or final data review. Please use these results with

the understanding that they may have not been finalized by the laboratory

Page 4 of 10

Apex Labs12232 S.W. Garden Place

Tigard, OR 97223

503-718-2323 Phone

503-718-0333 Fax

Portland, OR 97239 03/10/16 16:31Doug Hancock

4412 SW Corbett Ave

PBS Engineering and Environmental

Reported:

Project Manager:

Project Number:

PPS Metals ProjectProject:

6500.638

QUALITY CONTROL (QC) SAMPLE RESULTS

Total Metals by EPA 6020 (ICPMS)

Result LimitReporting

Units AmountSpike

ResultSource

%REC%RECLimits RPD

RPDLimit Notes Analyte MDL Dil.

Batch 6030265 - EPA 3051A Soil

Blank (6030265-BLK1) Prepared: 03/09/16 11:05 Analyzed: 03/10/16 10:04

EPA 6020A

Arsenic mg/kg wetND 1.00 --- --- --- --- 10 --- --- ---

Cadmium "ND 0.200 --- --- --- --- " --- --- ---

Nickel "ND 1.00 --- --- --- --- " --- --- ---

LCS (6030265-BS1) Prepared: 03/09/16 11:05 Analyzed: 03/10/16 10:07

EPA 6020A

Arsenic mg/kg wet51.4 1.00 80-120% --- --- --- 10 50.0 --- 103

Cadmium "51.6 0.200 " --- --- --- " " --- 103

Nickel "52.4 1.00 " --- --- --- " " --- 105

Matrix Spike (6030265-MS2) Prepared: 03/09/16 11:05 Analyzed: 03/10/16 11:30

QC Source Sample: 6 Green Thumb (A6C0319-06)

EPA 6020A

Arsenic mg/kg dry82.7 1.56 75-125% ---