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PUBLIC HEALTH SEkVICES <br /> SAN JOAQUIN COUNTY =: <br /> ENVIRONMENTAL HEALTH DIVISION a. <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0318 <br /> 209/468-3420 <br /> �} Lf <br /> DOUG SCHNEEBERGER <br /> WESTERN REFRIG/COLD STORAGE - - - ;� <br /> 2001 N W 107TH AVE 4 9% <br /> MIAMI FL 33172 <br /> RE: Tracy Cold Storage SITE CODE: 505329 <br /> 24500 S. MacArthur <br /> Tracy, CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Preliminary Investigation and Evaluation Report" <br /> dated March 9, 1995, prepared by Remcor, Inc. for the above referenced site. <br /> Soil and groundwater contamination exists in the area where an underground <br /> storage tank was located. On March 16, 1995, the existing monitoring wells were <br /> sampled. The results from the analyses on the groundwater samples collected then <br /> will provide additional information on the groundwater contamination. The <br /> groundwater samples to be analyzed for metals are to be field filtered. <br /> Table 9 of the report shows purgeable fuel as gasoline from monitoring well MW1 <br /> as 5200 micrograms per liter, but the laboratory report shows it as 52000 <br /> micrograms per liter. Please make this correction on table 9. <br /> The report states that a slug test was performed on monitoring well MW6 to <br /> determine the hydraulic conductivity of the upper portion of the saturated zone. <br /> Please describe how the test was conducted and provide the water level <br /> measurements recorded as an addendum to the report. <br /> Remcor has recommended drilling additional soil borings, performing hydropunch <br /> groundwater sampling, installing three deep monitoring wells, and installing a <br /> pumping well. Additional investigation of the site is necessary to define the <br /> lateral and vertical extent of the soil and groundwater contamination; and to <br /> determine the most cost-effective alternative for remediation. <br /> Another option to be considered in proceeding with the investigation would be to <br /> conduct the interim remedial action of excavation of the former tank pit area. <br /> Soil sample results from soil borings SBI-SB3 and SBS-SB13 indicate high levels <br /> of soil contamination. Soil boring logs show clay soil that is typical of this <br /> area and is difficult to remediate. MW1 would have to be destroyed prior to <br /> excavation and would have to be replaced. <br /> Push point sampling for obtaining additional soil and groundwater samples should <br /> also be considered. Decisions on installation of additional monitoring wells and <br /> the necessity of additional soil remediation can then be based on the information <br /> obtained. <br /> Sample taps should be installed at the well heads of the two water supply wells <br /> so that representative water samples can be obtained from these wells. Water <br /> samples obtained from the pressure tank that stores the water from the two wells <br /> are not representative of water in the aquifer since there is a time elapse <br /> between the time the water enters the pressure tank and the time when the water <br /> is sampled allowing the volatiles to escape. <br /> The vertical extent of groundwater contamination should be investigated at this <br /> site since the supply wells are close to the former UST area. PHS/EHD recommends <br /> A Division of San Joaquin County Health Care Services <br />