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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION _ <br /> Karen Furst, M.D., M.P.H., Health Officer �. P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> apy <br /> B M SAMSON <br /> SUTTER OFFICE CENTER C ( <br /> 2001 UNION STREET 1#300 <br /> SAN FRANCISCO CA 94123 JAN 2 5 2000 <br /> RE: 242 N. Sutter Street SITE CODE: 9327 <br /> Stockton CA 95202 <br /> APN 139-250-05 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the "Tentative Work Plan, Evaluation of Potential Groundwater Contamination" dated <br /> December 29, 1999 that was prepared by Hydro-Geo Consultants, Inc. on behalf of the above <br /> referenced site and has the following comments. <br /> The work plan proposes to install six direct-push soil borings to collect soil and groundwater <br /> samples for analysis. The purpose of this work is to evaluate the possibility that this site is a <br /> source of the groundwater contamination that has been evidenced in Unocal's monitoring well U-7, <br /> which is located on the south side of Miner Ave. near the corner of California Street. Historical <br /> records indicate that there are two potential former tank farms at the subject site, though their exact <br /> locations are unknown. Proposed boring locations are intended to cover the potential up-gradient <br /> and down-gradient areas of the site. Shallow soil samples need to be collected, as they should <br /> provide information on whether or not the tanks at this site ever leaked. The proposed depth of the <br /> borings is 35-feet bsg, or until groundwater is encountered. Grab groundwater samples will be <br /> collected by appropriate methods from each boring. The work plan proposes that all samples will <br /> be analyzed for total petroleum hydrocarbons as gas (TPHg) and TPH as diesel by EPA Method <br /> 8015, benzene, toluene ethylbenzene and xylene (BTEX) and methyl tertiary butyl ether (MTBE) by <br /> EPA Method 8020, and for total lead by EPA Method 7420. PHS/EHD requests that samples also <br /> be analyzed for all oxygenates by EPA Method 8260. The boreholes will be destroyed by <br /> backfilling with neat cement grout applied through a tremmie pipe. <br /> PHS/EHD approves the work plan with the conditions that both soil and water samples are <br /> collected, and that analysis is done for the above listed constituents. Please proceed with the <br /> submittal of a well permit application and required $89.00 fee. Forty-eight hours notice to <br /> PHS/EHD is required prior to performing fieldwork. If you have any questions or comments or wish <br /> to schedule fieldwork please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, Senior REHS MargaA�agorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Marty Hartzell, CVRWQCB <br /> John T. O'Rourke, Hydro-Geo Consultants, Inc. (enc.) <br /> A Division of San Joaquin County Health Care Services <br />