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J y r <br /> PUBLIC HEALTH SERVICES �A,.�•V�N., <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> r <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Of" <br /> 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201t <br /> q oR�:P <br /> 209/468-3420 <br /> HUSKY CRANE INC MAILED JUN 141995 <br /> 2373 MARIPOSA RD <br /> STOCKTON CA 95205 <br /> RE: Husky Crane SITE CODE: 1672 <br /> 2373 Mariposa Rd <br /> Stockton, CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has reviewed the report <br /> "Results of Soil Contamination Investigation and request for Site Closure" submitted by Wm. J. Hunter and <br /> Associates on December 5, 1994 and has the following comments. <br /> Conclusions reached within the report seem to suggest that the only contamination found on Husky Crane <br /> property originated from surface drainage of diesel runoff from the BJJ property to the southeast. <br /> PHS-EHD is concerned that only one of six soil borings (SB) was analyzed for Total Petroleum Hydrocarbons as <br /> Diesel (TPH-D) during this last phase of work. SB-F was the only soil boring analyzed for TPH-D and results <br /> verified that shallow soil contamination was present. SB-A was closer to the BJJ fueling island and PHS-EHD <br /> concluded this boring would have been the most likely to be impacted by surface run-off, and should have been <br /> analyzed for TPH-D. <br /> By failing to analyze SB-A, as well as the other soil borings for TPH-D, PHS-EHD is unable to come to the <br /> same conclusion as your consultant. Your request for site closure is unapproved at this time and further site <br /> investigation is required. <br /> Since the underground tank (UGT) removals were unwitnessed by PHS-EHD, some questions concerning the <br /> condition of the tanks, the soil beneath them, as well as the previous contents of the UGT's are still unresolved. <br /> Elevated levels of TPH-D and Motor Oil were detected in previous soil samples HCAN, HC-3E, HC-2S, and <br /> HCAP and confirmation sampling of the same constituents is required by PHS-EHD in order to better evaluate <br /> your site's subsurface conditions. <br /> PHS-EHD recommends that soil data be collected from the old tank pit, along the southerly fenceline, and at <br /> previous locations that have not be analyzed for TPH-D and Motor Oil. Sampling should start at the surface and <br /> continue consecutively downward in five foot (5') intervals in order to evaluate whether or not the groundwater <br /> is in jeopardy of being impacted. <br /> San Joaquin County Flood Control historical data records the highest groundwater in this area to be during <br /> Spring 1986, where the depth to water was approximately 50' bgs. PHS-EHD will be using soil data collected <br /> during this next required phase of investigation to evaluate any threat to groundwater and/or soil remediation. <br /> As a guideline, soil samples with TPH-D detected at concentrations of 100 ppm or greater at depths of 25' bgs <br /> or deeper, would constitute a failure of the Leaching Potential and your site will be required to conduct a <br /> groundwater investigation in the near future. <br /> A Division of San Joaquin County Health Care Services <br />