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i <br /> j PUBLIC 4EALTH SERACES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer •'. :. <br /> 304 E.Weber Ave., 3rd Floor • P. O. Boa 388 • Stockton, CA 95201-0388 <br /> 209/468-3420 <br /> PIED <br /> GARRIT VAN REIT C(nu Y <br /> DEBOER FAMILY TRUST <br /> P O BOX 635 <br /> RIPON CA 95336 <br /> MAILED h U G 141995 <br /> RE: DEBOER TRUCK LINES SITE CODE: 1467 <br /> 201 W FIFTH ST <br /> RIPON CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed the review of the "Soil/Groundwater Remediation <br /> Workplan" dated June 20, 1995, submitted by WHF Inc., and has the following <br /> comments for your consideration. <br /> The scope of work proposed in the workplan appears to be sufficient to remove the <br /> remainder of diesel impacted soil from the site. However, what initially appeared to <br /> be a simple soil removal/groundwater pumping effort is materializing into an <br /> extremely costly proposal. The levels of diesel contamination remaining in the soil <br /> are significant but the very limited groundwater impact observed from the monitoring <br /> wells around the former tank pit area indicates the contamination may be limited in <br /> volume. It is uncertain if these additional invasive measures would yield a greater <br /> benefit to groundwater resource protection than the mitigative efforts already <br /> performed at the site. <br /> Therefore, PHS/EHD recommends the proposed excavation work be postponed <br /> indefinitely. Rather, additional groundwater data can be collected over the next four <br /> quarters. This data will be evaluated to determine if the cost of additional mitigative <br /> work is warranted for the added benefit it would provide. Please continue to <br /> conduct quarterly sampling from the three existing monitoring wells for at least <br /> four more quarters. <br /> In addition, in order to further understand the groundwater dynamics at the site, <br /> PHS/EHD recommends obtaining depth to water measurements on a monthly basis. <br /> A survey should be conducted to identify any domestic, municipal, agricultural or <br /> industrial wells that may be located in the area. <br /> A Division of San Joaquin County Health Care Services <br />