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PUBL11 HEALTH SE&CES <br /> P <br /> SAN JOAQUIN COUNTY <br /> r.' <br /> ENVIRONMENTAL HEALTH DIVISION w' <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 c°C1FOR? v <br /> 209/468-3420 COP <br /> Y HAROLD AND DENA KNOWLES <br /> 19381 FAWN DRIVE <br /> LODI CA 95243 <br /> RE: 102 S WILSON WAY SITE CODE: 9031 <br /> STOCKTON CA <br /> Pleased be advised that field observations and monitoring of the soil from the soil borings recently drilled in and <br /> around the former tank pit and dispenser areas at the site show substantial petroleum contamination. This <br /> contamination in the soil is consistent with the general layout of the former tank system at the site and it appears <br /> to extend to groundwater. <br /> Based on the outcome of numerous remedial actions in this county at sites which are similar in nature to this one, <br /> soil vapor extraction has been demonstrated as the best available technology to reduce the levels of <br /> contamination given like conditions. <br /> Five soil borings were drilled in the area of impact and are available for completion as vapor extraction test wells. <br /> Any additional cost to build vapor wells in these available boreholes will not be excessive, and will certainly be <br /> less than the cost to destroy these boreholes now and redrill new boreholes in the same general area for this <br /> purpose in three to four months time. In addition, by constructing wells in these existing boreholes, the cleanup at <br /> the site will be initiated quicker, will lower overall cleanup costs and shorten the time to site certification. <br /> Therefore, San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) hearty directs <br /> you to install vapor extraction wells in these borings at this time. These wells will be used for initial testing <br /> purposes and will most likely be successfully utilized in the future remedial system as well. <br /> These existing wells will be available to begin contaminant reduction as soon as a system can be designed and <br /> implemented. Based on the results of the vapor extraction testing as well as actual data from an operating <br /> system, additional wells may need to be installed at the site at a future date to augment these initial wells. <br /> PHS/EHD understands that reimbursement from the State Water Resources Control Board Cleanup Fund <br /> (SWRCBCF) is a concern. PHS/EHD has contacted SWRCBCF staff and it was mutually agreed that the <br /> completion of these wells as vapor wells at this time is a more cost effective approach than to redrill these borings <br /> in the same general area at a later date. As long as the cost for the construction of the vapor wells is not <br /> excessive or unreasonable (similar costs to those of the monitoring wells already approved), it should not affect <br /> your reimbursement request. For an additional confidence level, you may send to SWRCBCF staff a brief <br /> estimate of the cost of the wells for their preapproval. <br /> If you have any questions or wish to discuss this letter in more detail, please contact Linda Turkatte, Senior <br /> REHS, at (209) 468-3441. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> � abel <br /> Linda A. Turkatte, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> cc lirt next page <br /> .a Division of San Joaquin County Health Care Services <br />