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a division of <br /> ENVIRONMENTAL SOLUTIONS June 24,T199�' ' Emeon `J <br /> `Project 20805-142.008 <br /> a <br /> Ms. Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Ave, Third Floor <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Re: Onsite Well Monitoring and Inspection Plan, ARCO Products Company Station No. 760, <br /> 225 South Cherokee Lane, Lodi, California <br /> Dear Ms. Lagorio: <br /> Pinnacle Environmental Solutions, a division of EMCON (Pinnacle), has prepared this workplan <br /> for continued monitoring of on-site wells located at ARCO Service Station No. 760, located at <br /> 225 South Cherokee Lane, Lodi, California(see Figures 1 and 2). The site received closure of the <br /> leaking undelgraund storage tank case. ARCO intends to keep the onsite monitoring wells (MW- <br /> 1 through MW-4) and onsite vapor extraction wells (VW-1 through VW-5 and VW-7 through <br /> VW-11) for future use, if necessary. In order to keep the wells in service, a monitoring plan is <br /> required by the San Joaquin County Public Health Services, Environmental Health Division <br /> (SJCPHS/EHD). <br /> Annual water level measurements in all onsite wells and wellhead inspections are proposed for <br /> the first quarter of each year. The water levels will be tabulated and a status report will be <br /> prepared and submitted to the SJCPHS/EHD. Wellhead inspection will confirm that the integrity <br /> of the well head has not been compromised. In the event the locking,ivell cap, vault box, or <br /> surface seal have been damaged, they will be repaired or replaced. <br /> If you have any questions regarding this plan, please call. <br /> Sincerely, <br /> Pinnacle <br /> Mark Capps, .G. Joel Coffman <br /> Project Geologist Technical Coordinator <br /> Attachments: Figure 1 Site Location <br /> Figure 2 Site Plan <br /> cc: Paul Supple, ARCO Products Company <br /> Pat Anderson, California Regional Water Quality Control Board, Central Valley Region <br /> 3939 Cambridge Road,Suite 220 Cameron Park,California 95682 (530)676-6884 (530)676-6885 Fax <br /> SAC\A:\760PLAN.DOC-96\mtt:1 <br />