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Vintage Car Wash - 3 - 13 May 2013 <br /> 601 E. Miner Ave., Stockton <br /> San Joaquin County <br /> Dale " TPHg B T E X MTBE T6A 1, 2- Pb EDB <br /> benzene tduess W benzene I leres <br /> 3A2 6,3pp a8 340 100 500 NA NA NA 6.1 14 <br /> 1 <br /> a00D 2,800 5.500 <br /> 2 NA 240 0.14 <br /> 1-m 620 2.3 12 52 <p NA I NA I NA <br /> 2-9] 10 14,200 to/ too 22 11220 45.5 NA M 35 <br /> -tow andam hymocarmns as basses MmE=anhp ran brad enter Tao= red amyl amhd i, 2ac <br /> Pb - -vathfusming M-nal wdNa4 z mrifirtam n ns® d rna a 2- wana an <br /> confiimneon sarpts NR - reponmisamv9mnae.TPHa m�e Min nN(Aealmred <br /> Pre-remediation sail isoconcentmtion maps are included as Figures 8 through 11. <br /> Table 2: Maximum groundwater concentrations are reported in micrograms per Liter (uga ). <br /> Oak TPHg B T E x WBE TM <br /> 3B2 725,000 <br /> 203,000 51,000 ,000 18,000 NA NA <br /> i9 44 190000 40000 22000 2100 10000 4D0 NA <br /> 10000 5 62 21 110 180 <20D <br /> "1 100,000 2xDO0 <br /> 23.000 2800 NA <br /> 50 14 O2400 me moo <20 NA <br /> 5-0 29M 3400 2000 1400 moo 91 NA <br /> 5-04 460D 200 140 140 520 42 NA <br /> 5-05 13000 1200 150 510 1100 Q00 W <br /> 6-07 21M 3500 180 150 12M <20 NA <br /> 5-08 11000 16D0 83 240 ]]0 <10 NA <br /> 5a9 i2 o <br /> 6-10 12WO <100 NA <br /> 290 5410 IWO <10 NA <br /> me140 420 830 NA <br /> 2-111 10D00 520 20D 470 930 <5 NA <br /> 5-11 5700 no 98 29D 400 <5 NA <br /> 9-11 I MOO I "a 140 4W 630 <5 NA <br /> 10-11 1 7300 1 500 95 ma <5 NA <br /> 11-11 I Was 510 an Also 398 <5 <br /> 1 =aM+dmXwNgwae'rew9m z fiw padrd 2=41w-2n4daanw444ue roava pcaid <br /> s=pm aanpbd 5= GWX-f rvNunyYedamro��remwxwmwd' <br /> The data show that groundwater concentrations did not increase significantly after a three <br /> month post-remediation rebound test conducted from September 2011 through November 2011 . <br /> The groundwater plume is stable and slowly declining in the source area onsite. The offit <br /> groundwater plume has contracted considerably since 1997. The Final Groundwater <br /> Isoconcentra ian Maps are included as Figures 12 through 16. <br /> Risk Assessment <br /> The Site soil va or maximum results for benzene (B, 28.52 ug/ms Figure 17), ethylbenzene <br /> (E, 28.22 ug/m , and naphthalene (N, non-detect at 28.83 ug/m) passed Me State Water <br /> Resources Control Board Low Threat Closure Policy (LTCP) Soil Gas Criteria for <br />