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Advanced <br /> GeoEnvironmental, Inc. <br /> 10 August 1999 <br /> AGE-NC Project No. 96-0232 <br /> Mr.Mike Infurna <br /> San Joaquin County Public Health Services Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton,California 95202 <br /> Subject: Collection of Three B's Truck Plaza Domestic Drinking Water Well Samples <br /> THREE B'S TRUCK PLAZA <br /> 14749 Thornton Road,Lodi,California <br /> Dear Mr.Infuma: <br /> As per our phone conversation on 10 August 1999,Advanced GeoEnvironmental,Inc.(AGE)recommends monthly <br /> sampling of the domestic drinking water well located at 14749 Thornton Road(Three B's Truck Plaza),Lodi,California, <br /> for analysis of methyl tertiary butyl ether(MTBE). <br /> The State of California Department of Health Services has adopted a concentration of 13 µg/1 as an action level for <br /> MTBE in March 1999,and has adopted a concentration of 5µg/1 as a secondary maximum contaminant level(MCL) <br /> in January 1999. <br /> The Three B's Truck Plaza domestic drinking water well was previously sampled in April of 1999. MTBE was not <br /> detected at the domestic drinking water well;however MTBE was detected at a nearby ground water observation well <br /> (MW-6) located less than 15 feet away at a concentration of 38 micrograms per liter(µg/1). MTBE concentrations <br /> detected at MW-6 exceed the action levels of 13 µg/1 and exceed the secondary MCLS of 5 ug/l. Due to the close <br /> proximity of MTBE-impact, AGE recommends that a monthly monitoring program be developed for sampling the <br /> domestic drinking water well with respect to MTBE concentrations.Ground water samples will be logged on a chain-of- <br /> custody form, placed in a chilled container and transported to a California Department of Health Services (DHS)- <br /> certified laboratory for analysis of MTBE by EPA Methods 8260. <br /> If you have any questions or comments,please contact me at(209)467-1006. <br /> Sincerely, �iED GFO� <br /> �\5 GNc Dfgso OG' <br /> Advanced GeoEnviron mental,Inc. c m� <br /> � <br /> 1 <br /> Timothy J. ell Nuel C. Henderson,Jr. <br /> Project Geologist Senior Project Geologist <br /> California Registered Geologist No.5837 <br /> cc: Mr.Andy Zarakani-Three B's Truck Plaza <br /> 4005 North Wilson Way, Stockton, California 95205 <br /> Telephone(209)467-1006 FAX(209)467-1118 <br />