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Advanced 1 <br /> eoEnvironmental I - -- <br /> 10 August 1999 <br /> AGE-NC Project No. 96-0232 <br /> Mr.Mike Infuma <br /> San Joaquin County Public Health Services Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton,California 95202 <br /> Subject: Collection of Rocky's Restaurant Domestic Drinking Water Well Samples <br /> FLAG CITY CHEVRON <br /> 6421 Capital Avenue,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 14659 Thornton Road(Rocky's Restaurant), 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 /,ig/l as an action level for <br /> MTBE in March 1999,and has adopted a concentration of 5 kg/I as a secondary maximum contaminant level(MCL) <br /> in January 1999. <br /> The Rocky's Restaurant domestic drinking water was previously sampled in February,April and June of 1999.MTBE <br /> was detected at concentrations between 7 micrograms per liter(µgQ)and 14µg/l during the three sampling occasions. <br /> MTBE concentrations detected at the Rocky's Restaurant domestic drinking water well exceeds action levels of 13µg/I <br /> and exceeds secondary MCLS of 5/cg/I.Therefore,AGE recommends that a monthly monitoring program be developed <br /> for sampling the domestic drinking water well with respect to MTBE concentrations. Ground water samples will be <br /> lagged on a chain-of-custody form,placed in a chilled container and transported to a California Department of Health <br /> Services(DHS)-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 /> ED Gt ' <br /> \G� G�END�9So rf <br /> Sincerely, rn <br /> No.3637 <br /> Advanced GeoEnvironmental,Inc. . <br /> Timothy 'el Nuel C. Henderson,Jr. <br /> Project G ogu Senior Project Geologist <br /> California Registered Geologist No. 5837 <br /> cc: Mr. Richard Bokides-Flag City Chevron <br /> 4005 North Wilson Way, Stockton,California 95205 <br /> Telephone(209)467-1006 FAX(209)467-1118 <br />