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Table 3 Summary of Soil Analytical Results, Organ ochlorinated Pesticides DTSC - Gordon Research Company Property, Manteca , California RV009808.0000 (D a 6 N X _ 7 Q N O C C Cr N = : N U O Co O LOV s Q c 5 m X- In N O OC(6- 0 0d' OVd 'QO LTMo O O O -6 CL CL ca _ c _ OQ L N N : (6 N Analyte: o w w w w w rn _ T. 4Z (- Method: EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A EPA 8081A Units. pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg pg/Kg Sample ID Date Sampled Depth` B- 1 -0.5 06/23/10 0.5 <3.3 <3 . 3 <3 .3 <1 .7 < 1 . 7 <1 . 7 <30 <1 .7 <3 .3 <1 .7 <3 .3 <3 .3 <3 .3 <3 . 3 < 1 .7 <1 .7 < 1 .7 < 17 <60 B-4-0.5 06/23/10 0.5 <3 .3 <3.3 <3 . 3 <1 .7 <1 .7 <1 .7 <30 <1 .7 <3 .3 <1 .7 <3.3 <3.3 <3.3 <3 . 3 < 1 .7 <1 .7 <1 .7 <17 <60 B-6-0.5 06/23/10 0.5 <33 <33 <33 <17 <17 <17 <300 < 17 <33 < 17 <33 <33 <33 <33 <17 <17 <17 <170 <600 B-7-0.5 06/23/10 0.5 <3 . 3 8.9 12 <1 .7 <1 .7 <1 .7 <30 < 1 . 7 <3 .3 <1 .7 <3.3 <3.3 <3 .3 <3 .3 <1 .7 <1 .7 < 1 .7 <17 <60 B-11 -0.5 06/23/10 0.5 <3.3 8 . 1 9.6 < 1 .7 <1 .7 < 1 .7 <30 <1 . 7 <3.3 <1 .7 <3 .3 <3 .3 <3. 3 <3.3 <1 .7 .< 1 .7 < 1 .7 < 17 <60 B-12-0.5 06/23/10 0.5 <3. 3 <3 .3 <3.3 < 1 .7 <1 .7 <1 .7 1 <30 < 1 .7 <3 .3 < 1 . 7 <3 .3 1 <3.3 <3 .3 <3.3 < 1 .7 <1 .7 < 1 .7 <17 <60 13- 14-0.5 06/23/10 0.5 <3 .3 15 6 . 0 < 1 .7 < 1 . 7 <1 .7 <30 < 1 .7 <3 .3 < 1 . 7 <3 .3 <3 .3 <3 .3 <3 .3 <1 .7 <1 .7 <1 .7 <17 <60 B-17-0 .5 06/23/10 0.5 <3 .3 13 4.6 <1 .7 <1 .7 < 1 .7 <30 < 1 . 7 <3 .3 < 1 .7 <3 .3 <3 .3 <3 .3 <3 .3 <1 .7 <1 .7 <1 .7 <17 <60 13-18-0 .5 06/23/10 0.5 <3 .3 <3.3 <3 .3 < 1 .7 <1 .7 <1 .7 <30 < 1 .7 <3 .3 <1 .7 <3.3 <3 .3 ' <3.3 <3 .3 <1 .7 <1 .7 <1 .7 < 17 <60 B-19-0.5 06/23/10 0 . 5 <3.3 14 7. 1 <1 .7 <1 .7 <1 .7 <30 < 1 .7 <3 .3 <1 .7 <3.3 <3.3 <3.3 <3 .3 < 1 .7 <1 .7 <1 .7 < 17 <60 B-20-0.5 06/23/10 0 . 5 <33 <33 <33 <17 <17 1 < 17 <300 < 17 <33 <17 1 <33 <33 <33 <33 <17 <17 < 17 <170 <600 B-30-0 .5 06/23/10 0 .5 5 .4 170 70 < 1 .7 . <1 .7 <1 .7 <30 <1 .7 <3.3 < 1 .7 <3.3 <3. 3 3.6 <3. 3 <1 .7 7.4 < 1 .7 <17 <60 B-40-0.5 06/24/10 0 .5 < 16 190 130 <8A <8.4 <8A < 150 <8A <16 <8.4 21 1 < 16 < 16 <16 <8A <8A <8A <84 <300 B-41 -0.5 06/24/10 0.5 32 780 550 <1 .7 <1 .7 <1 .7 <30 <1 .7 <3.3 <1 .7 82 17 <66 <3 . 3 <1 .7 <1 .7 < 1 . 7 <17 <60 B-42-0 .5 06/24/10 0.5 <65 <65 260 <34 <34 <34 <590 <34 <65 <34 <65 <65 <65 <65 <34 <34 <34 <340 <1200 B43-0 .5 06/24/10 0.5 < 16 100 1 90 1 <8.5 <8.5 <8.5 < 150 1 <8 . 5 1 < 16 <8.5 < 16 <16 <16 < 16 <8.5 <8.5 <8.5 <85 <300 Statistical Summary Total Number of Samples : 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 Number of Detects: 2 9 10 0 0 0 0 0 0 0 2 1 1 0 0 1 0 0 0 Maximum Concentration : <65 780 550 <34 <34 <34 <590 <34 <65 <34 82 <65 <66 < 65 <34 <34 <34 340 <1200 Minimum Concentration: 3 .3 3 .3 3 . 3 1 .7 1 . 7 1 .7 30 1 . 7 3 . 3 1 . 7 3.3 3.3 3 . 3 3 . 3 1 . 7 1 . 7 1 .7 17 60 f Average Concentration: 14-4 90 76 6.5 6 . 5 6.5 114 6. 5 12 . 5 6.5 17.7 13. 3 16 . 4 12 . 5 6 . 5 6.8 6.5 65 229 Standard Deviation: 17.8 193 144 9 . 1 9 . 1 9. 1 158 9. 1 17 . 4 9. 1 24.4 17.3 21 . 7 17 . 4 9 . 1 9.0 9. 1 91 321 Comparison Criteria (Converted to pg/Kg for comparison to above soil results) CHHSLs 2300 1600 1600 33 430 35 21000 500 130 340000 460 I ESLs 77 270 82000 82000 61 RSLs 270 Is maximum concentration (or detection limit if - result is ND) below CHHSLs/ESLs/RSLs? YES YES YES -YES YES YES NO YES NO YES YES YES YES YES YES . YES NO Quality Control Summary Duplicate Samples B-20-0.5 06/23/10 0.5 <33 <33 < 33 < 17 < 17 <17 <300 < 17 <33 < 17 <33 <33 <33 <33 <17 <17 <17 <170 <600 DUP3 06/24/10 0.5 <16 <16 < 16 <8A <8 .4 <8.4 <150 <8A <16 <8.4 <16 <16 <16 < 16 <8.4 <8A <8.4 <84 <300 RPD(%) 69% 69% 69% 68% 68% 68% 67% 68% 69% 68% 69% 69% 69% 69% 68% 68% 68% 68% 67% I B-17-0.5 06/23/10 0.5 <3.3 13 4 . 6 < 1 . 7 < 1 .7 < 1 .7 <30 <1 .7 <3 .3 . <1 .7 <3.3 <3.3 <13 <3 . 3 <1 .7 < 1 .7 <1 .7 < 17 <60 DUP5 06/24/10 0.5 <65 <65 <65 <34 <34 <34 <590 <34 <65 <34 <65 <65 <65 <65 <34 <34 <34 < 340 1 < 1200 RPD(%) 181 % 133% 174% 1 181 % 1 181 % 1 181 % 1 181 % 1 181 % 181 % 1 181 % 1 181 % 1 181 % 1 181 % 181 % 1 181 % 1 181 % 1 181 % a 181 % 181 % All samples analyzed by Curtis & Tompkins, Ltd. , Berkeley, California < = Not detected above laboratory reporting limit indicated. pg/Kg = Micrograms per kilogram - = Not Analyzed or Not Applicable RPD = Relative Percent Difference * = Depth measured in feet below ground surface CHHSLs = California Human Health Screening Levels, Cal-EPA (January 2005). ESLs = Environmental Screening Levels, RWQCB (May 2008). Table K-1 ; Direct Exposure Soil Screening Levels for Residential Exposure Scenario. RSLs = Regional Screening Levels, USEPA (May 2010). Comparison criteria applicability: primary comparison criteria are CHHSLs, if available. If CHHSLs are not available, ESLs are used. if ESLs are not available, RSLs are used to evaluate whether maximum concentration is above criteria . Tables 1 -9-PEA Work Plan Addendum-RV009808.xis 4/20/2011 ARCADIS9 Pa etofl