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Pacific Car Wash Page 2 of 2 <br /> 4405 Pacific Avenue May 23, 2013 <br /> Stockton, California 95207 <br /> • Semi-annually collect groundwater samples from monitoring wells MWA through MW- <br /> 3, MW-6, and MW-10A or MW-10B (alternating between the two wells); analyze the <br /> samples for TPH-g; benzene, toluene, ethyl benzene and total xylenes (BTEX); methyl <br /> tertiary butyl ether (MTBE) and 1,2-dichloroethane (1,2-DCA); <br /> • Collect groundwater from MW-4, MW-7, MW-9, MWA3B, and MWA6B 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. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by email at <br /> vmccartneyOD-sicehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Walth Specialist 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 />