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=X:;PUBLIC: HEALTH SERVICE S pp.U1M <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION "=" � <br /> i <br /> Karen Furst, M.D., M.P.H., Health Officer f A <br /> F <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 o <br /> 2091468-3420 <br /> FILE COPY <br /> ROBERT BOUST j <br /> UNOCAL CORPORATION FEB 2 4 1999 <br /> 2121 N CALIFORNIA BLVD SUITE 250 <br /> WALNUT CREEK CA 94596 j <br /> RE: Former Unocal#2859 SITE CODE: 1213 <br /> 1665 Pacific Avenue <br /> Stockton, CA <br /> On January 4 through January 8, 1999, the drilling and installation of monitoring wells NP1 and <br /> MW10 occurred. NP1 was drilled to a depth of 90 feet below surface grade(bsg). A 1 inch well <br /> casing was installed in the bore hole with a screened interval from 85 to 90 feet bsg. A second <br /> well casing was to be installed in this bore Dole with'a screened interval from 50 to 60 feet bsg. <br /> The cement grout planned to end at 60 feet bsg extended to 57 feet bsg. It was decided that NP1 <br /> should be grouted to surface and a second boring drilled for placement of a well with the screened I <br /> interval of 50 to 60 feet bsg. That well, MW10, was constructed with 2 inch well casing. I <br /> I <br /> Baseline Mobile Laboratory was on site during this work and analyzed soil and groundwater <br /> samples that were collected. It was indicated to PHS/EHD staff that there were higher levels of <br /> soil and groundwater contamination at 60 feet bsg than at 50 feet bsg and that the last water <br /> sample obtained at 70 feet bsg was contaminated. <br /> All the monitoring wells for this site (including NPI and MW10) were purged and sampled on <br /> February 4, 1999. <br /> A report describing the above work and providing the analytical results of the soil and water <br /> samples collected has not been submitted to PHS/EHD or the Central Valley Regional Water , <br /> Quality Control Board to date. Please submit a report with this information immediately. <br /> If you have any questions contact me at(209)468-3449. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Margaret Lagorio, Supervising REHS <br /> Site Mitigation Unit <br /> c: CVRWQCB—Mark List <br /> San Joaquin County Deputy District Attorney, David Irey ' <br /> ARCADIS Geraghty & Miller—Dr. Stephen Cullen <br /> Helen McCrary <br /> SWRCB—Rick Rempel <br /> Brooke Birkie, Esq. <br /> A Division of San Joaquin County Health Care Services <br />