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} <br /> I� M <br /> �' SEkVICES .PUBLIC. HEALTH <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION J. <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> ��FOR <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> OCT 312001 <br /> JIM PARKINSON <br /> PARKINSON'S ARCO <br /> 3250 W HAMMER LN <br /> STOCKTON CA 95209 <br /> RE: Parkinson's ARCO Site Code: 2224 <br /> 3250 W Hammer Ln. <br /> Stockton,CA 95209 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has reviewed <br /> "Third Quarter 2001 Groundwater Monitoring Report"dated August 24,2001 and"Additional Assessment <br /> Report"dated December 5,2000 prepared by IT Corporation on your behalf. Based upon the results of <br /> these subsurface investigations,the lateral and vertical extent of soil and groundwater contamination <br /> remains undefined. Therefore,additional soil and groundwater investigation on and off-site is warranted. <br /> Grab groundwater sample results from borings GP-1 through GP-5 done in August of 2000 show methyl <br /> tertiary butyl ether(MtBE)at concentrations as high as 47,000 parts per billion(ppb). Quarterly sampling <br /> results from the past year show MtBE steadily increasing in MW-1-as high as 40,000 ppb indicating the <br /> need for interim remedial action and control of the MtBE plume at this site. <br /> A work plan to define the vertical and lateral extent of soil and groundwater contamination and interim <br /> remedial alternatives to control the off-site migration of MtBE should be submitted to PHS/EHD by <br /> December 17,2001. Please contact Sam Savig,EHS at(209)468-3453 if you have questions regarding <br /> this letter. <br /> Donna Heran,REHS,Director <br /> Environmental Health Division <br /> Sam Savig,EHS =Margareteagorio,REHS <br /> LOP/Site Mitigation Unit IV Supervisor LOP/Unit IV <br /> cc: Marty Hartzell-CVRWQCB <br /> Kathleen Waldo-IT Corperation <br /> i <br /> i <br /> I <br /> i <br /> I <br /> A Division of San Joaquin County Health Care Services <br />