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PUBLIC HEALTH SERN-iCES <br /> PpUiiy <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> N: X <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer •`. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> ALAN WALL F 17 10JSf <br /> SUTTER OFFICE CENTER <br /> 2001 UNION ST #300 <br /> SAN FRANCISCO CA 94123 <br /> Re: 242 North Sutter Avenue, Stockton CA Site Code: 9327 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) pursuant to <br /> PHS/EHD correspondence dated January 25, 1996 has prioritized your site for placement into the <br /> Local Oversight Program. <br /> PHS/EHD has enclosed information from the "Limited Phase I Environmental Site Assessment" which <br /> was prepared by GeoStrategies and that included results of the Sanborn Company Map Review and <br /> Aerial Photograph Review. The results of the Sanborn Company map review indicated that <br /> sometime between 1917 and 1950 a service station was located on the parcel now addressed as <br /> 242 North Sutter (southwest corner of California and Miner) with San Joaquin County Assessor's <br /> Number 139-250-05. The results of the Aerial Photograph review indicated that between August <br /> 14, 1952 and June 1, 1963, the site's station building was no longer visible. The 1972 Sanborn Map <br /> identified the site again as a service station which was confirmed in the November 9, 1975 Aerial <br /> Photograph. The 1983 Aerial Photograph indicated that the site no longer had a service station <br /> building and appeared to be used as parking which is its current use. <br /> PHS/EHD has also enclosed a copy of the 1996 Assessor's Map for the site indicating the current <br /> APN for the site. Finally, PHS/EHD has enclosed information obtained during the investigation of <br /> the former Unocal Station located at 437 East Miner Avenue. <br /> It is possible that the contamination observed adjacent to your property in monitoring well, U7, is <br /> not attributable to the former operation of underground storage tanks at your site; but given the <br /> predominate gradient to the northeast and Unocal's groundwater plume boundaries, sufficient <br /> evidence exists to place your site into the Local Oversight Program and to require further <br /> investigation of the suspected release. <br /> At minimum, a work plan should be submitted by June 1 , 1997 which proposes soil and/or <br /> groundwater investigation in the areas where the former tanks are suspected to have been located. <br /> If you have any questions, please contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margare agorio, REH <br /> Site Mitigation Unit Supervisor <br /> Enclosures (30 pages) <br /> cc: Elizabeth Thayer, CVRWQCB (w/enclosures) <br /> cc: Bob Boust, Unocal (w/o enclosures) <br /> A Division of San Joaquin County Health Care Services <br />