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Table 8 Summary of Soil Analytical Results,Dioxins DTSC-Gordon Research Company Property,Manteca,California RV009808.0000 U O D U LL O O O O U U o U U U 3 ❑ ❑ U U U U O U m m m m ❑ ❑ ❑ ❑ p U U m m m w U m m m = o ❑ ❑ ❑ U '° m d m x cv T m S Z x ao U U U U m �, d 2 2 Z m 1n X m a ao v d, r` ❑ m01 1% Anualnyittes: Hat1bhy al1b r r ati ❑ v m co ario vm O o CR � r: r o U 0. x x vi lo P% C6 C6 i ai 0) m m vi 't (V <V fV 1V 6 O O 6 N N M N 11 tV O 1 O i P9/9 PWq Pg/9 p9/g p9/9 pg19 P9/9 P9/9 P9/9 p9/9 Pg/g p9/9 p9/9 p9/9 P9/9 p9/9 p9/9 P9/9 p9/9 P9/g aC� p9/9 P9/g Sample ID Date Sampled Statistical Summa Tolal Number of Samples. 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 Number of Detects: 1 2 3 2 6 6 6 3 4 6 6 4 2 2 11 4 5 2 3 5 6 6 Maximum Concentration: 2.57 7.04 8.22 31.2 32 473 2840 13 60.8 284 888 9.4 3.56 5.33 8.47 5.18 3.78 0.96 157 5.55 200 26.9 Minimum Concentration: 0.091 0.31 0.17 0.27 0.231 3.72 32 0 0 0.971 6.58 0.15 0.071 0.072 0.146 0.22 0.1 0.1 0.09 0.18 8.9 0 708 Average Concentration: 0.61 1.60 1.96 8.2 6.88 124 768 2.26 11.3 64 228 2.36 0.88 1.77 2.31 2.10 2.02 0.27 45.3 2.14 67.7 7 23 Standard Deviation: 0.96 2.68 3.09 11.8 12.36 177 1047 5 26 24.3 109 332 3.49 1.34 1.95 3.10 1.82 1.46 0.34 61.0 2 31 70 4 9.91 Comparison Criteria x onve a o p g for comparison to above soil resu s CHH SLs 4 6 ESLs RSLs i..lteli� bd..I:HHSLsiESLsIRSLs"/ NO QualitunControl Summary Duplicate Samples 8-20-0.5 6/23/2010 0.56 U 1.0 U(1) 1.3 U(1) 4.52 J 2.94 J 69.1 561 0(1) 2.47 1 28.4 127 1 1.72 J 0.68 U(1) 2.5 U0 2.0 U(1) 2.95 J 3.33 J 0.24 U 36.9 1.48 J 54 DUP3 6/24/2010 0.11 U 0.53 U 1 0.681 J 2.20 J 1.74 J 25.3 155 0 1.54 17 46.5 0.66 J 0.45j 1.64 J 1.27 J 2.15 J 2.33 J 0.066 U 9.3 0.454 J 11 RPD % 134%1 61% 1 62% 1 69% 1 51% 1 93% 1 113% 1 146%1 50% 1 93% 1 87% 1 41X 42% 45X 1 31% 1 35% 1 114%1 119% 1 106% 1 132% All samples analyzed by Maxxam Analytics. pg/Kg=Picograms per kilogram(parts per trillion) RDL=Reportable Detection Limit CHHSLs=California Human Health Screening Levels,Cal-EPA(January 2005). EDL=Estimated Detection Limit ESLs=Environmental Screening Levels,RWQCB(May 2008).Table K-1,Direct Exposure Soil Screening Levels for Residential Exposure Scenario. TEF=Toxic Equivalency Factor RSLs=Regional Screening Levels,USEPA(May 2010). TEQ=Toxic Equivalency Quotient N/A=Not Applicable CDD=Chloro Dibenzo-p-Dioxin RPD=Relative Percent Difference CDF=Chloro Dibenzo-p-Furan The Total Toxic Equivalency value reported is the sum of Toxic Equivalent Quotients for the congeners tested. J=Estimated concentration between the EDL and the RDL U=Undetected at the limit of quantitation Concentrations in bold typeface were reported above the comparison criteria. (1) EMPC/NDR-Peak detected does not meet ratio cntena and has resulted in an elevated detection limit. (2) RT>3 seconds-PCDD/DF analysis-Peak detected exceeds expected retention time(from internal standard)by greater than 3 seconds. RT>2 seconds-PCDD/DF analysis-Peak detected exceeds expected retention time(from monitering ion peak)by greater than 2 seconds. (3) EMPC I NDR-Peak detected does not meet ratio criteria and has resulted in an elevated detection limit. EMPC/DPE-Diphenylether interference present caused dibenzofuran detected to become a"non-detect"with an elevated detection limit. (4) EMPC I DPE-Diphenylether interference present caused dibenzofuran detected to become a"non-detect'with an elevated detection limit. (5) Duplicate results exceeded RPD acceptance criteria.This may be due to sample heterogeneity. Tables 1-9 PEA Work Plan Addendun.RV009808.4s 4/20/2011 ARCADIS Page 2 of 2