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Pacific Car Wash March 2014 <br /> 4405 Pacific Avenue, Stockton <br /> Claim No: 12325 <br /> Remediation Summary <br /> • Free Product: Free product historically noted in MW-2, but no free product sheen noted in <br /> MW-2 since June 2011. <br /> • Soil Excavation: Unknown volume. <br /> • In-Situ Soil/Groundwater Remediation: Soil vapor extraction was conducted between <br /> March 2012 and present for a total of 3,370 hours, which reportedly removed 12,008 <br /> pounds of TPHg. Groundwater extraction conducted between March 2012 and present for <br /> a total of 3,370 hours, reportedly removed 275,930 gallons of contaminated groundwater <br /> including 30 pounds of dissolved TPHg. <br /> Most Recent Concentrations of Petroleum Constituents In Soil <br /> Constituent Maximum 0-5 feet bgs Maximum 5-10 feet bgs <br /> [mg/kg( date sample name m /k date <br /> Benzene 28 11/04/91 FL1 <0.005 09/27/02 <br /> Eth (benzene 642 11/04/91 FL1 <0.00509/27/02 <br /> Naphthalene NA NA <br /> PAHs NA NA <br /> NA: Not Analyzed,Not Applicable or Data Not Available <br /> mglkg: Milligrams per kilogram, parts per million <br /> <: Not detected at or above stated reporting limit <br /> PAHs: Polycyclic aromatic hydrocarbons <br /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE TBA <br /> Date (pg/L) (pg/L) (pg/L) Benzene (pg/L) (pg/L) (pg/L) <br /> (jig/L) <br /> MW-1 06/05/13 35,000 630 51 220 523 <1 <10 <br /> MW-2 06/05/13 45,000 31 5.7 140 146 <1 <10 <br /> MW-3 06/05/13 40,000 21 4 340 267 <1 <10 <br /> MW-4 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-5 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-6 06/05/13 94,000 30 27 1,600 4,300 4 NA <br /> MW-7 12/28/08 <50 <0.5 <0,5 <0.5 <0.6 <1 <10 <br /> MW-8 12/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-9 12/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-10a 06/05/13 <50 <0.5 <0.5 <0.5 <0.6 6.6 NA <br /> MW-10b 06/05/13 <50 <0.5 <0,5 <0.5 <0.6 91 NA <br /> MW-11 12/13/12 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-12 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-13a 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-13b 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-13c 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-13d 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-14a 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-14b 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-14c 03/28/08 <50 <0.5 <0.5 <0.5 <0,6 11 <1 <10 <br /> MW-14d 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-15a 03/28/08 <50 <0,5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-15b 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> Page 9 of 15 <br />