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r <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> �PSAN JOAQUIN COUNTY <br /> Y.- _�f'.oG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor <br /> �. - Director Mike Huggins,R.E.H.S.,R.B.I. <br /> IL ,Al OlsenR.E.H.S. Stockton, California 95202-2708 <br /> �.• Douglas W.Wilson,R.E.H.S. <br /> • cq. �w Pr-ograin Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> i'9 OR Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-01.38 Mark Barcellos,R.E.H.S. <br /> AUG 2 4 2004 <br /> JIM PARKINSON <br /> PARKINSON' S ARCO <br /> 3250 W HAMMER LANE <br /> STOCKTON CA 95209 <br /> RE: Parkinson's ARCO SITE CODE 2224 <br /> 3250 West Hammer Lane RO: 709 <br /> Stockton, CA 95209 <br /> San Joaquin County Environmental Health Department (EHD)has reviewed Cone <br /> Penetration Test (CPT)Assessment Report, dated December 8, 2003,First Quarter 2004 <br /> Groundwater Monitoring Report, dated January 30, 2004, and Second Quarter 2004 <br /> Groundwater Monitoring Report, dated July 9, 2004, submitted on your behalf by Shaw <br /> Environmental, Inc. (Shaw). Based upon the CPT groundwater analyticalresultsand the <br /> soil analytical results for the deep boring advanced on May 22, 200 , {'1�•i extent of <br /> impacted groundwater and soil appears to have been delineated vertically at this site.- <br /> Although <br /> ite:Although lateral delineation down gradient of the methyl tertiary-butyl ether(MTBE) <br /> plume has not been fully demonstrated, EHD does not believe that a monitoring well, <br /> located on the east side of Kelley Drive and north of West Hammer Lane, is necessary at <br /> this time. This decision is based, in part, on analytical results for monitoring well MW-7, <br /> located near CPT-4, reported in Quarterly Groundwater Monitoring Report—First <br /> Quarter 2004 prepared by Secor International Incorporated(Secor) for the 76 Service <br /> Station located at 3202 West Hammer Lane. MW-7 is screened between 12.5 feet and <br /> 29.5 feet below surface grade, and current analytical data for petroleum hydrocarbons in <br /> groundwater collected during the first quarter monitoring event were non-detect, except <br /> for MTBE reported at 10 micrograms per liter. Also, EHD has approved a work plan <br /> f o <br /> submitted by Secor for the installation one monitoring well to be located on the <br /> northeast corner of Kelley Drive and West Hammer Lane, inboard of the site of Shaw's <br /> proposed monitoring well. <br /> EHD recommends that you investigate the possibility of coordinating monitoring events <br /> with the 3202 West Hammer Lane site and request that data from MW-7 and Secor's <br /> proposed additional well be made available to you. If this cannot be done, EHD will <br /> approve installation of your well. EHD believes it is more important and appropriate at <br /> this time to move your site toward remediation; therefore,please prepare and submit a <br /> corrective action plan to EHD by October 29, 2004. <br />