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f <br /> •1 <br /> NVIRONMElN TAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> N 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> AI Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> •.� Douglas W.Wilson,R.[;.H.S. <br /> .a,P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �iFOR Laurie A.Cotulla,R.E.H.S. <br /> Pro gram Manager Fax: (209) 464-0138 Markobert McClcllon,R.E.H.S.� g Mark Barccllos,R.E.H.S. <br /> OLYMPIAN JV 1111AR 0 1. W`5 <br /> 2000 ALAMEDA DE LAS PULGAS <br /> SUITE 242 <br /> SAN MATEO CA 94403 <br /> RE: Jimco Truck Plaza SITE CODE: 1604 <br /> 1022 Frontage Road(Formerly 22502 S. Highway 99) <br /> Ripon, California <br /> San Joaquin County Environmental Health Department (EHD) has reviewed analytical <br /> results for groundwater samples collected from January 2003 through October 2004 at the <br /> above-referenced site in response to Proposed Well Sampling Schedule 2005 dated <br /> January 25, 2005 and submitted by Cambria Environmental Technology, Inc. (Cambria) <br /> on your behalf. EHD approves the removal of 1,2-dibromoethane (EDB) from the <br /> analytical list of-compounds for all monitoring wells at this site. Although 1,2- <br /> dichloroethane(1,2-DCA) has not been detected in any of the monitoring wells at your <br /> site, 1,2-DCA has been detected at high concentrations adjacent to your site at Ripon <br /> Farm Service located at 932 Frontage Road. Therefore, EHD believes it would be <br /> prudent to continue sampling for 1,2-DCA in monitoring well MW-8 and the domestic <br /> well, considering the close proximity of these two wells to the contaminated site. <br /> EHD recommends the following sampling schedule for future sampling events. <br /> Quarterly TPH- BTEX by TPH- Method 8260B Quarterly <br /> Well Sampling gasoline by Method diesel by Analyses Groundwater <br /> Frequency Method 8021 B or Method Monitoring <br /> 80158 8260B 8015E <br /> 1 2 3 4 <br /> MW-1 x x x x x x x igMTBE <br /> , TBATX <br /> MW-2 x x x x A <br /> X x x <br /> MW-3 x x x x <br /> MW-4 x x <br /> MW-5 xx x x x - <br /> X x MTBE x <br /> MW-6 x x x x x MTBE <br /> MW-7 x x <br /> x x x x <br /> MTBE,TAME, <br /> X x TBA, 1,2-DCA x <br /> MW-8 x x x x x <br /> MW-9 x x x x x x x MTBE, TAME, TBA x <br /> MTBE, TAME, TBA <br /> Domestic Weill x x x x x <br /> X x 1,2-DCA x <br />