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ENVIRONMENTAL HEALTH'IEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Reran R.E.H.S. <br /> ' 304 East Weber Avenue, Third Floor Carl Boins,R.an, .HS.,I.S. <br /> Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.x.s. Stockton, California 95202-2708 <br /> ' Douglas W.Wilson,R.E.€{.S. <br /> ;� Progran,Manager Telephone: (209) 468-3420 Margaret Lagorio, RT.H.S, <br /> Laurie A.Cotnlla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Bareellos,R.E.H.S, <br /> MS SANDI SARALE <br /> P O BOX 6066 <br /> 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 reviewed <br /> Additional Site Assessment Work Plan (AWP); prepared by Advanced <br /> GeoEnviron mental, Inc. (AGE) for the above-referenced site. <br /> The AWP describes the general regional geologiclhydrogeologic setting, removal <br /> of the underground storage tank (UST), and previous site assessment <br /> investigations and results. In the AWP, AGE proposes to advance four paired <br /> cone penetration testing (CPT) borings to a target depth of 50 feet below surface <br /> grade (bsg) to better characterize the hydrogeologic setting and to assess the <br /> vertical and lateral extent of impacted soil and groundwater. A technical <br /> justification for how each proposed CPT location will meet the EHD directive <br /> issued by letter dated 12 August 2004 to complete the lateral assessment was <br /> not presented. <br /> EHD concurs with the idea of a CPT investigation to delineate the vertical and <br /> lateral extent of impacted media and to expand the hydrogeological model. While <br /> the proposed CPT locations appear to have some merit, most are not placed <br /> significantly outside the area of known contamination. EHD believes that <br /> additional CPT points should be advanced to better complete the lateral <br /> delineation of impacted media, primarily toward the northwest of MW-2, northeast <br /> and southeast of MW-3, and potentially south of the building and east of MW-4 if <br /> the proposed CPT-4 encounters impacted media. <br /> Please submit a work plan addendum to address these issues to this office by <br /> 18 January 2005. The addendum should provide a technical justification for each <br /> proposed boring location and demonstrate that the proposed scope of work is <br /> necessary and adequate to fully address the current directives for this site under <br /> the current state of knowledge of the site. If additional follow-up phases of work <br />