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Table 8 Summary of Soil Analytical Results , Dioxins DTSC - Gordon Research Company Property , Manteca , California RV009808 . 0000 r U Z W J LL LL LL LL 0 + QD U *K LL LL D Q @ p U U U `II W o U U U U ca x CO x = D 0 U U �° �° axi axi axi axi = = U co _ I I °0 U U U U @ ami ami = S = 2 00 X a. 0o ao o� r` p m �° ;� Q a a 00 00 co rn r� 0o LL O F- 00 °o co p ami ui a� F- 00 00 ti r r °o co p 00 t` d' CD ti qq7 U F- 0_ X I 00 f� r (0 co t` V 'V U Q M M M M M M M M C C7 C M W M cNi 0 Analyte: O F- F- O units: pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg/g pg /g pg/g Sample ID Date Sampled Statistical Summary Total 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 3 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 . 58 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 . 98 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 1 . 46 1 0 . 34 1 61 . 0 1 2 . 31 1 70 . 4 9 . 91 omparison Criteria (Converted to pg/Kg for comparison to above soil results) CHHSLs 4 . 6 ESLs RSLs maximum concentration below CHHSLs/ESLs/RSLs? NO _Quality Control Summary Duplicate Samples B-20- 0 . 5 6/23/2010 0 . 56 U 1 . 0 U ( 1 ) 1 . 3 U ( 1 ) 4 . 52 J 2 . 94 J 1 69 . 1 561 10 ( 1 ) 2 . 47 28 . 4 127 1 . 72 J 10 , 68 U ( 1 ) 2 . 5 U ( 1 ) 2 . 0 U ( 1 ) 2 . 95 J 3 . 33 J 0 . 24 U 36 . 9 1 . 48 J 11154 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 . 68 J 0 . 45 J 1 . 64 J 1 . 27 J 2 . 15 J 2 . 33 J 0 . 066 U 9 . 3 0 . 454 J 11 RPD (% ) 134 % 61 % 62 % 69 % 51 % 93% 113 % 46 % 50 % 93 % 87 % 41 % 42% 45 % 31 % 35 % 114 % 119% 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 criteria 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 / 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 / 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 Addendum-RV009808 . xis Page 2 of 2 4/20/2011 ARCADIS