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ENVIRONMENTAL HEALTHN-AEPARTMENT <br /> oPa '" c SAN JOAQUIN COUNTY <br /> _•} „y Donna K. Heran, R.E.H.S. Unit Supervisors <br /> Director304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> r. Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> Program Manager Telephone: (209)468-3420 Douglas W. Wilson, R.E.H.S. <br /> 4LrFo.Ra: <br /> Margaret Lagorio,R.E.H.S. <br /> Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> MS SANDI SARALE APR 13 2006 <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 received and <br /> reviewed Additional Monitoring Well Installation Work Plan (WP), dated 23 March <br /> 2006, prepared by Advanced GeoEnvironmental, Inc. (AGE) for the above- <br /> referenced site. In the WP, AGE proposes to install four additional groundwater <br /> monitoring wells (MW-5 through MW-8) screened in a thick sand unit directly <br /> underlying the currently existing monitoring wells (MW-1 through MW4) and one <br /> deeper monitoring well (MW-9) to assess for the vertical extent of impacted <br /> groundwater. Proposed monitoring wells MW-5 through MW-8 are to have a total <br /> depth of approximately 35 feet below surface grade (bsg) and are to be <br /> completed in the sand of hydrological unit 2 (HU2). MW 9 is proposed to bottom <br /> at a depth of 60 feet bsg to be completed in hydrological unit 4 (HU4). Each well <br /> is proposed to have a five-foot screen interval. <br /> The scope of work, proposed monitoring well locations and analytical regimen <br /> are approved with the following recommendations. The cross sections and the <br /> CPT boring logs in the third quarter 2005 report show the HU2 sand unit <br /> generally lying between 22 and 32 feet bsg. EHD recommends that the screens <br /> be placed near the top of the potentially significant contaminant migration <br /> pathway. Based on the occurrence of sand in CPT-2 and CPT-5, EHD <br /> recommends that the HU4 well be screened at approximately 50 to 55 feet bsg. <br /> Soil samples should be collected to properly place each screen interval within the <br /> sand zones of interest. <br /> EHD also recommends that representative soil samples be collected from each <br /> interval of potential interest to analyze for natural organic matter (NOM) and soil <br /> oxygen demand (SOD) to obtain data useful for evaluating in situ oxidation <br /> should that seem a potentially useful remediation technique at a later time. <br />