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0.�4u1N•.0 <br /> PUBLIC HEALTH SERVItES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> G%FOP <br /> 445 N. San Joaquin Street • P.O. Box 388 Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> 0 F-11 <br /> Y <br /> BOB BOUST <br /> UNOCAL <br /> 2000 CROW CANYON PL STE 400 MAR 0 3 Mli; <br /> SAN RAMON CA 94583 <br /> RE: Former Unocal Station #0187 Site Code: 1181 <br /> 437 East Miner Avenue <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division(PHS/EHD) has completed review of <br /> the "Work Plan for a Limited Subsurface Investigation" dated February 14, 1995 and prepared by GeoStrategies. <br /> PHS/EHD has the following comments for your consideration. <br /> The Work Plan proposed the installation of five additional monitoring wells, U4 -U8, to further define the extent <br /> of the groundwater contamination. Two of the five wells are proposed for offsite installation,in the City of Stockton <br /> right-of-way. Please be informed that two drilling permits will be necessary, one for the onsite field work and one <br /> for the offsite field work. Please also note that prior to issuance of a PHS/EHD drilling permit for the offsite work, <br /> a City of Stockton encroachment permit must be obtained. <br /> The work plan also proposed the drilling to groundwater of three onsite soil borings, UN - UP, to investigate the <br /> lateral and vertical extent of soil contamination. The work plan indicated that should field conditions warrant, the <br /> soil borings may be converted into vapor extraction wells. PHS/EHD recommends that vapor extraction wells be <br /> installed in appropriate locations to evaluate the feasibility of vapor extraction as a remedial option. <br /> PHS/EHD concurs that the proposed investigation should further define the extent of soil and groundwater <br /> contamination necessary to develop a corrective action plan. Please be aware that sufficient samples should be <br /> collected from the borings to confirm the extent of soil contamination. Any necessary deviations from the approved <br /> plan due to varied field conditions must be approved by PHS/EHD prior to implementation. <br /> Please submit two permit applications, with $89 per permit application, and a copy of the City of Stockton <br /> encroachment permit to obtain a PHS/EHD drilling permit. Also,PHS/EHD must be notified at least 48 hours prior <br /> to initiating field activities so that sampling and grouting inspections can be scheduled. <br /> If you have any questions or wish to schedule a site inspection, please contact Mary Meays, at (209) 468-0337. <br /> Donna Heran, Director, REHS <br /> Environmental Health Division <br /> Mary Meayseays, S� Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MNV437MINER/A <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: SteptlEtTCMtar, GeoStrategies - Sacramento <br /> A Division of San Joaquin County Health Care Services <br />