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N ,z <br /> h Remo Canepa Page 5 of 9 <br /> 6230 Pacific Avenue 4/17/2009 <br /> Stockton CA <br /> Canepas Car Wash - MW-2 <br /> 6230 Pacific Ave. <br /> 1000000 <br /> 100000 <br /> o r <br /> N <br /> 10000 <br /> 4/21/99 TPHg <br /> 000 0 • Senzene <br /> 7 E <br /> MTBE <br /> 10/21/96 o <br /> 100 <br /> 10 <br /> 7 <br /> c'°A c9 cd aa� °e a° o° cp^ J& �°'� c°°' °,cp <br /> Monitoring Dates <br /> • MW-2 , located cross-gradient from the source areas, is screened from 50 to 70 <br /> feet bsg and had approximately 14 feet of water above screen during the last <br /> reported monitoring event. TPHg and benzene concentrations were significant <br /> and fluctuated widely from December 1994 to April 1999, but following <br /> implementation of SVE , exhibited much less variation and a gradual decline, a <br /> trend that continued to November 2008 , the implementation of GWE does not <br /> appear to have greatly affected TPHg and benzene concentration trends. MTBE <br /> exhibited an increasing trend similar to that described for MW-1 , and perhaps for <br /> the same reason . After July 2002, MTBE was detected only once, at 1 part per <br /> billion (ppb). In the opinion of the EHD , the concentration trends in this well are <br /> not suggestive of a second release , and are the opposite of those cited by F&B <br /> to support the new release interpretation for the Lahontan Region site - <br /> increasing TPHg and BTEX. <br /> Second Release Evaluation 0409 <br />