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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY = : <br /> V ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D ., M.P.H., Health Officer P. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 ; FORN� <br /> 209/468-3420 <br /> STEVE JERKINS C 0 [Ply <br /> SUPERINTENDENT OF ENGINEERING <br /> CRYSTAL CREAMERY AND BUTTER COMPANY <br /> PO BOX 1313 <br /> SACRAMENTO CA 95086 DEC 0 3 1999 <br /> RE: Crystal Creamery and Butter Company CODE: 2098 <br /> 404 W Fremont St. <br /> Stockton CA 95086 <br /> Three dual completed soil vapor extraction/air sparging wells (SE/ASW) , as proposed in the Site <br /> Investigation Workplan (the Workplan) dated June 5, 1996 and the Workplan Addendum dated July 10, <br /> 1997 prepared by Wallace, Kuhl & Associates, Inc (Wallace) , were installed at the above referenced site <br /> on November 20, 1997. The Workplan proposed conducting an air sparging/vapor extraction pilot test <br /> to evaluate the feasibility of a soil vapor extraction/air sparging remediation alternative. This test has <br /> not been performed to date. <br /> According to Revised Quarterly Status Report dated October, 7, 1999 prepared by Wallace, depth to <br /> groundwater (DTW) had risen to approximately 12 feet below surface grade (bsg) in the monitoring <br /> well (MW-4) closest to the three SE/ASW in April 1998, but has since fallen to approximately 14 feet <br /> bsg in August 1999. Currently, DTW is still within but not above the soil vapor extraction screen <br /> section. San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> recommends conducting the proposed feasibility test. PHS/EHD recommends using a high flow/low <br /> vacuum strategy to minimize draw-up of the groundwater in the wells. <br /> In a telephone conversation on November 23 , 1999, PHS/EHD recommended Wallace provide the <br /> following additional data for the feasibility study in a work proposal: <br /> 1) Schematic of the system to be used for the test, including equipment such as flow meters, <br /> vacuum/pressure gauges, sampling ports, vapor temperature sensors, control valves, etc. <br /> 2) Frequency and number of measurements to be taken. <br /> 3) The type of vapor treatment to be used during the soil vapor extraction test: i.e. biofilters, <br /> catalytic oxidation, or thermal oxidation. <br /> 4) The type and level of sensitivity of the helium detection instrument, if helium is to be used for <br /> the air-sparging test. <br /> Submit the feasibility test proposal to PHS/EHD by December 20, 1999 . The proposed work should <br /> commence by January 20, 2000. If you have any questions, please feel free to contact Jeffrey Wong at <br /> (209)468-0335 . <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Cki C. F GM <br /> eyWl t�i_c <br /> RHSJe rMargaret agor , <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region - Warren M. Hartzell <br /> c: Wallace - Kuhl & Associates, Inc. - Mathew Taylor <br /> i <br /> A Division of San Joaquin County Health Care Services <br />