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PUBLIC HEALTH SERVICES OPQV�N' C <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION y <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • R O. Box 388 • Stockton, CA 95201,-03,812 c9��FaR��P <br /> 209/468-3420 <br /> ALFRED KROGER " <br /> HOLT BROS INC <br /> P 0 BOX 8130 <br /> STOCKTON CA 95208 <br /> RE : Holt Brothers Tractor Co . SITE CODE: 1988 <br /> 1541 W. Charter Way <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has received correspondence from your attorney <br /> requesting our assistance in providing justification for the <br /> excavation of the petroleum contaminated soil at the above <br /> referenced site as requested by the State Water Resources Control <br /> Board (SWRCB) Cleanup Fund Program. <br /> PHS/EHD and the Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) have been requesting since June 1990, that the <br /> former tank area be excavated. Soil boring and monitoring well <br /> logs from 1988 and 1989 indicate silty clay and clayey silt soil <br /> exists to 40 feet below grade. As discussed in the "Remediation <br /> Feasibility Study at Holt Brothers" dated April 19, 1991, <br /> prepared by RESNA vapor extraction and bioremediation would be <br /> limited by the extremely low soil permeability. <br /> Groundwater contamination in monitoring well MWl increased from <br /> high levels when it was installed in 1988 to free product in <br /> 1990 . Free product continued to exist in MW1 until the <br /> excavation of the contaminated soil in September 1995 . <br /> Groundwater samples from monitoring well MWS were non-detect when <br /> it was first installed and dissolved contaminants later moved <br /> into this downgradient well . <br /> PHS/EHD allowed excavation activities to be postponed, at Holt <br /> Brothers request, due to the cost involved and the need to <br /> replace the loading dock that was previously adjacent to the <br /> former tank location. <br /> A "Soil Remediation Workplan" was submitted to PHS/EHD in January <br /> 1994 and an addendum was submitted in April 1994 . A copy of the <br /> letter dated June 16, 1994, from PHS/EHD approving the work is <br /> enclosed for you to provide to the SWRCB Cleanup Fund Program. <br /> This letter should document that PHS/EHD verbally approved the <br /> continued excavation of contaminated soil beyond the original <br /> scope of work proposed by Foothill Engineering. In June 1995 <br /> A Division of San Joaquin County Health Care Services <br />