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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION w °",v <br /> z <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 {iFoa <br /> 20914b8-3420 <br /> BOB MURDOCx AUG 13 1997 <br /> CITY OF STOCKTON <br /> 425 NORTH EL DORADO ST <br /> STOCKTON CA 95202 <br /> RE: Fire Station#7 SITE CODE. 232403 <br /> 1767 Hammer Lane <br /> Stockton CA <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has completed review of the <br /> "Site Characterization"report prepared by Twining Laboratories and dated July 18, 1991. PHSIEHD has the following <br /> comments for your consideration and response. <br /> On December 20, 1996,two soil borings, SB I and SB IA,were advanced for the purpose of collecting soil and <br /> groundwater samples. Two additional soil borings, SB2 and SB3,were advanced on December 23, 1996 for the <br /> purpose of collecting soil samples to define the lateral extent of the contamination. The report indicated that the <br /> samples were submitted to Twinning Laboratories and that some samples were then submitted under subcontract to <br /> APPL for analysis. Unfortunately,the chain of custody for the samples which were subcontracted to APPL was not <br /> included in the report submitted,thus making it impossible to correlate APPL's sample identification numbers with the <br /> field designated identification numbers. The laboratory report also did not include the QA/QC data for the Twinning <br /> Laboratories analytical report or for APPL's sample#824244-46438S. It is also not clear whether or not this sample <br /> was analyzed within the required M day holding time. Please submit the missing chain of custody and the QAIQC data <br /> for the respective laboratory reports. <br /> The summary tables of the analytical results which were obtained during this investigation did not note the detection <br /> limits for the results. As the summary table will be used as part of the historical record for the site, please prepare a <br /> summary table which indicates what detection limits were achieved and which summarizes all the analytical <br /> information obtained to date. Please also submit boring logs which have been signed by an appropriate registered <br /> professional. <br /> Soil and groundwater contamination was detected in samples collected from SPI, SP2 and SP3. The grab groundwater <br /> sample was collected at 40 feet below ground surface from SPI. While the concentrations detected in this grab <br /> groundwater sample was relatively low,72 ppb TPH-diesel, significant soil contamination of up to 4,100 ppm TPH- <br /> diesel was detected at 13 feet below ground surface. Please submit by September 26, 1997 a work plan to continue the <br /> investigation and/or to perform a limited excavation which would then be followed by an evaluation of any remaining <br /> contamination. <br /> If you have not done so, PHSIEHD strongly suggests that an Underground Storage Tank Cleanup Fund application be <br /> submitted to the State Water Resources Control Board. If you require assistance to complete the application or if you <br /> have any questions, please contact Mary Meays at(209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margaret agorio, REHS <br /> Site Mitigation Unit Supervisor <br /> cc: Elizabeth"Thayer, CVRWQCB <br /> cc: James Giottonini,City of Stockton Public Works <br /> cc: Clay Rodgers,Twinning Laboratories <br /> A Division of San Joaquin County Health Care Services <br />