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ENVIRONAWKNTAL HEALTH B-iPARTMENT Qutnr SAN JOAQUIN COUNTY Donna K. Iferan, R.E.H.S. Unit Supervicors Director 3 04 East-Weber Avenue,Third PI oof 'Call - Borpmn,R.E.H.S. Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggifl.q, R.E.H.S., R.,D.1. Program Manager Douglas W. Wilson,R.E.H.S Telephone: (209)468-3420 Margaret Lagorio,R.E.RS.. Fax: (200) 464-0138 Robefi McClellon, R.E.H.S. Website;www.sjgov.org/ehd/ JefrCa�ruescb. R.E.B.S. MS SANDI SARALE APR 13 2006 P 0 BOX- 6066 RECEIVED STOCKTON CA 95206 APR 2006 RE: SARALE FARMS Site Code: 0850 16500 CLIFTON COURT RD STOCKTON CA 95206 San Joaquin County Environmental Health Department (EHD) has received and reviewed Additional Monitoring Well Installation Work P16n (WP), date.dIs March 2006; prepared by Advanced GeoEnvironmental, Inc. (AGE) for the above referenced site. In the WP, AGE proposes to install four additional gro'Undwater monitoring wells (MW-5 through MW-8) screened in a thick sand unit directly underlying,the currently existing monitoring wells (MW-1 through MW-4) and one deeper monitoring well (MW-9) to assess for the vertical extent of impacted groundwater. Proposed monitoring wells,MW-5 through MW-8 are to have a total depth of approximately 35 feet below surface grade, (b.s.g) and are to be completed in the sand of.hydrological unit 2 (HU.2). MW-9 is proposed to bottom at a depth of 60 feet bsg to be completed ,in hydrological unit 4 (HU4). Each well is proposed to have five-foot screen interval. The scope of work,. proposed monitoring well locations and analytical regimen are approved with the following recommendations. The cross sections- and the� CPT boring logs in the third quarter 20015 report show the HU2 sarid unit generally lying between 22' and 32 feet bsg. EHD recommends that the screens be placed near the too of the potentially significant contaminant migration pathway. Based on the� occurrence of sand in CPT-2 a.rid CPT--5,, EHD recommends that the HU4 well be screened at approximately 50 to 55. feet 'bsg. Soil samples should be collected to properly place each screen interval within the: sand zones of interest, EHD also recommends that representative soil samples, be collected from each int(DMII of potential interest to analyze for natural organic matter (NOM).and.soil oxygen demand (SOD) to obtain data useful for evaluating in situ;.oxidation should that seem"a potentially useful remediation technique at a later time.