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i w <br /> Pacific Car Wash Page 2 of 2 <br /> 4405 Pacific Avenue October 11, 2013 <br /> Stockton, California 95207 <br /> In Groundwater Monitoring Report — Second Quarter 2013, AGE has recommended the <br /> continued semi-annual monitoring and sampling of MW-1 through MW-3, MW-6 and MW-10 <br /> (A and B) and the biannual monitoring and sampling of the remaining wells. Instead, the EHD <br /> directs that the sampling schedule first presented by letter dated 23 May 2013 be <br /> implemented, which includes: <br /> • Semi-annually collecting groundwater samples from monitoring wells MW-1 through <br /> MW-3, MW-6, and MW-10A or MW-10B (alternating between the two wells); analyze <br /> the samples for TPH-g; benzene, toluene, ethyl benzene and total xylenes (BTEX); <br /> methyl tertiary butyl ether(MTBE) and 1,2-dichloroethane (1,2-DCA); <br /> • Collect groundwater from MW-4, MW-7, MW-9, MW-13B, and MW-16B during the next <br /> sampling event and analyze the samples for TPH-g, BTEX, and MTBE. If <br /> contaminants of concern are not detected in the samples, then discontinue monitoring <br /> and sampling these wells. <br /> • Discontinue monitoring and sampling all wells not listed in the previous two bullets. <br /> Please revise the table titled "Summary of Monitoring Well Details" that is included in each <br /> groundwater monitoring report to include vapor well VW-4 and groundwater extraction wells <br /> EW-2, EW-3 and EW-5 and include these wells in all maps of the site. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by email at <br /> vmccartneyRsicehd com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health pecialist Engineering Geologist <br /> c: Mr. Timothy J. Cuellar, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />