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• Cambridge Road <br /> S,,te 220 <br /> Cameron Pask, CA 95682-9007 <br /> Tel. 530.676.6884 <br /> Fax.530.676.6885 <br /> theOgr "ll: 02 <br /> Dup <br /> August 17, 1999 <br /> Project 797615 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Re: ARCO Facility No. 6100, 25775 Patterson Pass Road, Tracy, California <br /> Dear Ms. Lagorio: <br /> Pinnacle Environmental Solutions, a member of The IT Group (Pinnacle) is submitting <br /> this letter on behalf of ARCO Products Company to follow up an August 12, 1999 <br /> telephone conversation regarding the above referenced site. In a letter dated June 15, <br /> 1999, the San Joaquin County Public Health Services, Environmental Health Division, <br /> requested an addendum to the October 12, 1998 Hydrocarbon Mass Evaluation Report <br /> that included reevaluation of the mass estimate, sampling the on-site water supply well, <br /> and reviewing prior soil analytical chromatograms to evaluate the presence of MTBE. <br /> During the conversation, we requested an extension to the August 16, 1999 deadline. The <br /> deadline was extended to September 17, 1999. The on-site water supply well will be <br /> sampled on Thursday, August 19, 1999 as requested. The sample will be analyzed for <br /> petroleum hydrocarbons, including oxygenates, as requested in the SJCPHS letter of June <br /> 15, 1999. <br /> If you have any questions, please call. <br /> Sincerely, <br /> Pinnacle <br /> oel Coffman <br /> Mark Capps, R.G. <br /> Project Geologist Senior Project Supervisor <br /> cc: Paul Supple, ARCO Products Company <br /> CP:\E:\ARCO\6100\CORRES\NIL081799.DOC-98Usg:1 <br /> 797615 <br />