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FIFTH FLOOR ` PAGE 02 <br /> ,/2091 15:23 20946834 f 1 ( ) <br /> SERVICES q�+a .�o <br /> PUBLIC HEALTH .� <br /> SAN JOAQUiN COUNF'Y <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst,M.D., M.P.H.,Health Officer <br /> 304 East Weber Avenue,Third Floor• Stockton, CA 95202 <br /> 2091468-3420 <br /> OCT 312001 <br /> JIM PARKINSON <br /> PARKINSON'S ARCO <br /> 3250 N HAMMER LN <br /> STOCKTON CA 95209 <br /> RE: Parkinson's ARCO Site Code:2224 <br /> 3250 W Hamner 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 24,200.1 and"Additional Assessmmat <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(WEE)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 Herau,REHS,Director <br /> Environmental Health Division Y <br /> Sam Savin,EHS Margaret gorio,"HS <br /> LOP/Site Mitigation Unit N Supervisor LOP/LTnit IV <br /> cc_ Marty Hartzell-CVRWQCB <br /> Kathleen Waldo-IT Corperation <br /> A Division of San Joaquin County Hmlth`Care Services <br />