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San Joaquin County DIRECTOR <br /> Environmental Health Department Donna Heran, REHS <br /> ..COG ASSISTANT DIRECTOR <br /> 2� 600 East Main Street Laurie Cotulla, REHS <br /> ` :� Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • ,- � Mike Huggins, REHS, RDI <br /> Margaret Lagorio, REHS <br /> q�/FORS\ Website: www.sjgov.org/ehd Robert McClellon, REHS <br /> Phone: (209) 468-3420 Jeff Carruesco, REHS, RDI <br /> Fax: (209) 464-0138 Kasey Foley, REHS <br /> July 29, 2009 <br /> Mrs. Edna Moore <br /> 3400 Wagner Heights Road <br /> Apartment 346 <br /> Stockton, California 95209 <br /> Subject: Moore Truck Lines <br /> 3400 Newton Road <br /> Stockton, California 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed the Soil <br /> Vapor Extraction Pilot Study Work Plan, dated October 20, 2008, prepared by Advanced <br /> GeoEnvironmental, Inc. (AGE) on your behalf for the above-subject site. The work plan was <br /> submitted to address the methyl tertiary-butyl ether (MTBE) concentrations found in soil <br /> samples collected from soil boring B1/MW-1 and soil boring B2 that may be migrating <br /> downward through the vadose zone and impacting groundwater. <br /> In the work plan, AGE proposes to conduct one twenty-four-hour soil vapor extraction (SVE) <br /> pilot test using monitoring wells MW-1, screened between forty-four and sixty-four feet below <br /> surface grade (bsg), and MW-8, screened between sixty and seventy feet bsg, as extraction <br /> wells. The remaining six monitoring wells (MW-2 through MW-7) will be used as observation <br /> wells to measure the induced vacuum. AGE proposes to collect influent vapor samples using <br /> Tedlar bags at start-up and at regular intervals from the inlet of the extraction well; and an <br /> effluent sample will be collected at the beginning and termination of the SVE pilot test. AGE <br /> proposes to analyze the vapor samples for total petroleum hydrocarbons quantified as <br /> gasoline (TPH-g), benzene, toluene, ethyl benzene and total xylenes (BTEX), MTBE, ethyl <br /> tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butyl alcohol (TBA), <br /> and di-isopropyl ether (DIPE). <br /> The EHD approves the work plan as submitted. Please complete the SVE pilot test and <br /> submit the report of findings to the EHD by December 31, 2009. Based on the results, SVE <br /> may be implemented if shown to be technically justified and cost effective. <br /> If you have any questions regarding this letter, please contact Vicki McCartney at (209) 468- <br /> 9852 or by e-mail at vmccartney(a)sjcehd.com. <br />