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TOP Filling Station Page 2 of 2 <br /> 101 S. Wilson Way April 6, 2015 <br /> Stockton, CA 95205 <br /> o During semi-annual groundwater sampling events, sample VW-1A, VW-1B, <br /> VW-26, VW-3B, VW-4, EW-1, and EW-2 when necessary to monitor GWE <br /> remediation system efficacy. <br /> As many of the wells have not been sampled within recent years, please sample all semi- <br /> annual, annual, and biennial scheduled wells during the next sampling event. At minimum, <br /> groundwater samples should be analyzed for the following: total petroleum hydrocarbons as <br /> gasoline; methyl-tert-butyl-ether (MTBE); t-Butyl alcohol (TBA); diisopropyl ether (DIPE); ethyl-t- <br /> butyl ether (ETBE); t-Amyl methyl ether (TAME); 1-2 dichloroethane (1,2-DCA); 1,2- <br /> dibromomethane (EDB); and benzene, toluene, ethylbenzene, xylenes (BTEX). <br /> If you have any questions concerning this letter, please contact Gabriel Gonzalez at (209) 468- <br /> 3442, or by email at gagonzalez@sjcehd.com. <br /> Sincerely, <br /> Gabriel Gonzalez, EHS Nuel Henderson, PG <br /> Environmental Health Specialist Engineering Geologist <br /> c: James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, via GeoTracker <br /> Tim Cuellar, AGE, 837 Shaw Road, Stockton, California 95215 <br />