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Former Countryside Market - 2 - • 8 August 2012 <br /> 10848 Copperopolis Rd., Stockton <br /> San Joaquin County <br /> Table 1 Groundwater Monit ring Results <br /> Well Date TPHg Benzene Toluene Ethylbenzene Xylenes 1,2-DCA TBA <br /> MW-1 1/25/2012 890 41 2.2 6.4 29.1 170 17 <br /> 5/1/2012 250 19 0.75 5 17.62 150 <7 <br /> MW-2 1%25/2012 2,300 180 120 47 430 83 <10 <br /> 5/1/2012 8,000 1,000 1,500 490 1,500 570 <7 <br /> MW-3 1/25/2012 <100 <0.5 <0.5 <0.5 <1 <0.5 <10 <br /> 5/1/2012 <40 <0.2 <0.3 <0.2 <0.4 0.56 <7 <br /> MW-4 1/25/2012 <100 <0.5 <0.5 <0.5 <1 0.5 <10 <br /> 5/1/2012 1 <40 <0.2 <0.3 <0.2 <0.4 3.1 <7 <br /> MW-5 1/25/2012 700 27 3.8 18 158.3 13 <10 <br /> 5/1/2012 1,400 120 1 15 22 257 63 <7 <br /> TPHg=total petroleum hydrocarbons as gasoline 1,2-DCA= 1,2-dichloroethane TBA=tert butyl alcohol <br /> After two quarters of sampling, groundwater concentrations are increasing in MW-2 <br /> (downgradient of the USTs pit) and MW-5 (upgradient of the USTs pit towards the Site <br /> domestic well). <br /> On 7 March 2012, five of the seven downgradient domestic wells (10757, 10856, 10922, <br /> and 10967) near the Site and the onsite domestic well (10848) were sampled. One <br /> domestic well owner refused access and one owner could not be reached. Site access <br /> agreements were signed prior to sampling the domestic wells. On 15 March 2012, two <br /> domestic wells (10757 and 10967) were resampled. The Site domestic well (10848) <br /> and the two downgradient domestic wells (10757, 10967) were sampled on 1 May 2012. <br /> With the exceptions noted in Table 2 below, all remaining domestic well results were <br /> non-detect. <br /> Domestic Well Date Benzene 1,2-DCA <br /> 3/7/2012 0.22 <0.3 <br /> 10757 0pr5/13/15/2012 <0.2 <0.3 <br /> p bury KFC /2012 <0.2 <0.3 <br /> 3/7/2012 0.221 101 <br /> 10967 3/15/2012 <0.21 251 <br /> 8-f 3/15/2012 <0.2 7.8Z <br /> J=J-flagged as an estimated value below reporting limits 1 =pre-treatment(well) 2=post owner's carbon treatment <br /> After three rounds of sampling (1/25/2012, 3/7/2012, and 5/1/2012) of the site domestic <br /> well, which is located 50' from MW-5, all Site domestic results have been non-detect for <br /> all constituents. However, sample results from domestic wells 10757 and 10967 <br /> reported benzene at the exact same J-flagged concentrations below the benzene <br /> maximum contaminant level (MCLS, 1 ug/L), and 10967 reported 1,2-DCA (10 ug/L) <br /> above the MCLS (0.5 ug/L) on 7 March 2012. Upon resampling on 15 March 2012, both <br /> 10757 and 10967 wells were non-detect for benzene (<0.2 ug/L) and 10967 again <br /> I <br />