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i� <br /> Linda S.Thompson <br /> Project Coordinator cc�-Co <br /> PO-3038 <br /> . 7131293-2887 <br /> r• t <br /> Remediation Technology cdndcoancP i T <br /> Fax: 7131293-3305 P.fO:'`i3oz'478 ��1x 'j1�f� <br /> ustan, TX 7721 bk4784 <br /> October 22, 1993 16 <br /> Mr. Harlin Knoll <br /> San Joaquin County PHS/EHD <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> e <br /> RE: Request for Reduced Sampling Frequency and Report Consolidation <br /> Former Econo Gas Station <br /> 4325 East Washington Street - <br /> Stockton, California <br /> Dear Mr. Knoll: <br /> Per our telephone conversation today, I am writing to request a modification of Conoco <br /> Inc.'s sampling and reporting procedures for the above referenced site. <br /> Upon your approval, Conoco will reduce the sampling of monitoring wells at this site from <br /> quarterly to annually. This is based on historical concentrations of Total Petroleum <br /> Hydrocarbons as gasoline (TPHg) and benzene, toluene, ethyl benzene and xylene (BTEX) <br /> that have been below the detection limit. If future monitoring well samples contain <br /> significant concentrations of TPHg or BTEX, the sampling frequency may be return to <br /> quarterly. <br /> Also upon your approval, Conoco will consolidate the annual groundwater monitoring report <br /> with the appropriate quarterly vapor extraction report. This consolidation will reduce the <br /> number of reports received by your office from eight to four per year. Any unit downtime <br /> or operating anomalies of the groundwater or vapor systems will be noted in the quarterly <br /> -_ reports._ <br /> If you have any questions, please contact me at (713) 293-2867. <br /> Sincerely, <br /> Linda S. Thompson <br /> Project Coordinator <br />