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C-ANfBRI- A <br /> PH l'. August 14, 1997 <br /> Mr. Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, 3'Floor <br /> Stockton, CA 95201-0388 <br /> Re: Response to Additional Investigation Request <br /> Shell Service Station <br /> 341. Main Street <br /> Ripon, California . <br /> WIC#204-6562-0804 <br /> Cambria#240-324-6 <br /> Dear Mr. Rowe: <br />� I <br /> In our July 17, 1997 meeting,you_requested that Cambria Environmental Technology, Inc. (Cambria) <br /> modify our July 11, 1997 investigation work plan for the Shell site referenced above to include two <br /> additional wells. Your request was based on your concern that the methyl tert-butyl ether (MTBE) <br /> detected at the adjacent Chevron Station could be from the Shell site. According to the analytic data <br /> that you provided for the Chevron site on July 18, 1997, MTBE was detected once last year, at <br /> maximum concentrations of only 13 parts per billion(ppb). Because the MTBE concentrations detected <br /> at the Chevron site are below the current MTBE regulatory standard of 35 ppb,it is premature to install <br /> three wells at the Shell station. We instead recommend installing the single well as originally proposed <br /> in our July 11, 1997 work plan and analyzing the ground water sample. If MTBE is detected at <br /> sufficient concentrations to warrant additional wells,then we will install the wells within four weeks <br /> of receiving the analytic results for the first well. This approach will ensure that we install the <br /> additional wells if and only if hydrocarbons including MTBE are detected in the initial source area well. <br /> Cambria will obtain county permits and schedule drilling upon receiving written work plan approval <br /> from the SJCPHS. We will submit our investigation reportabout six weeks after completing the field <br /> work. <br /> CAMBRIA <br /> We appreciate the opportunity to work with you on this pro'ect. Please call if you have any questions <br /> ENVIRONMENTAL or comments. V�EO Gn <br /> GvQ.�T <br /> TECHNOLOGY,INC. Sincerely, F`QO <br /> Cambria Envir ental Technology,Inc. ��2 <br /> 1144 65TH STREET, No.5747 <br /> SUITE B <br /> N. Scott M cLeod, R.G. <br /> OAKLAND, principal Geologist OFCA►-�F�P <br /> CA 94608 <br /> cc: Mr.A.E. (Alex)Perez, Shell Oil Company,P.O.Box 4023,Concord,CA 94524-4023 <br /> )420-0700 F:\PROJECI\§ ELL\RIP34I\Res onse to Additional Investi ation R uest.wpd <br /> P S e9 <br /> FAx:(510)420-9170 <br />