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ENVIRONMENTAL HEALTH eE.PAR.TMENT <br /> Unit Supervisors <br /> SAN JOAQUIN COUNTY <br /> Donna K.Heran,R.E.H.S. Carl Borginin.R.E.B.S. <br /> 304 East Weber Avenue, Third Floor S R.U.I. <br /> Direcloi Nlikc Huggins,RIJ <br /> Al Olsen,R.F.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.F,11.S. <br /> ' <br /> Telephone: (209) 468-3420 Margaret Lagorio.R.E.H.S. <br /> 6'�4Laurie A.Cotulla,P-E.H.S. Fax: (209) 464-0138 Robeil McClellon,RRII.S. <br /> prograin Manager Mark'13urcc1loi,R.E.H.S. <br /> Lo MS SANDI SARALE FEB 0 8 2 <br /> P 0 BOX 6066 <br /> La STOCKTON CA 95206 <br /> RE: SARALE FARMS Site Code: 0850 <br /> 16500 CLIFTON COURT RD <br /> STOCKTON CA 95206 <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> La reviewed Quarterly Report— Third Quarter 2005 (QR), dated 15 November 2005, <br /> prepared by Advanced GeoEnvironmental, Inc. (AGE) for the above-referenced <br /> site. In the OR, AGE presented the results and interpretations of the 31 August <br /> 2005 through 02 September 2005 cone penetration test (CPT) boring <br /> investigation of your site. <br /> The cross sections and the CPT boring logs in the OR show a sand unit of <br /> variable thickness, identified as hydrological unit 2 (HU2), generally lying <br /> between 20 and 40 feet below surface grade (bsg) occurring across your site. <br /> EHD interprets this sand unit to potentially be a significant contaminant migration <br /> pathway. The existing monitoring wells are completed primarily in the fine- <br /> grained interval (HUI) between 5 and 20 feet bsg, although it is possible that the <br /> bottoms of monitoring wells MW-1, MW-2 and MW-4 penetrate the top few <br /> inches of HU2. <br /> L.* Three sand units between 50 and 90 feet bsg (HU4) were identified in the CPT <br /> borings beneath the fine-grained interval between 40 and 50 feet bsg (HU3). Two <br /> of the HU4 sand units yielded impacted groundwater samples from CPT2. <br /> Additional monitoring wells should be set in HU2 to assess the lateral extent of <br /> impacted groundwater in this hydrological unit. At least one additional monitoring <br /> well should be set in the upper sand of HU4 to confirm the CPT results. Screen <br /> intervals for each well should be carefully selected to address individual sand <br /> units and to avoid providing vertical conduits between sand units. The initial HU2 <br /> wells should be located near the impacted HUI wells (MW-1 through MW-4) and <br /> the HU4 well should be located near CPT2 and the suspected contaminant <br /> source area. Please submit a work plan to EHD by 27 March 2006 to continue <br /> the site assessment. <br /> LA <br /> Le <br />