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PVBLC14EALTH SER� CE <br /> SAN JoAQUINCOUNTY <br /> ENVIRONMENTAL HEALTHDIVISION <br /> z:a <br /> .�.. <br /> Acting Health Officer <br /> M.P.H., LIFO <br /> Ernest M. Fujimoto, M•D•, CA 95201.0388 <br /> 445 N. San Joaquin Street • P• O• Box 388 • Stockton, <br /> 209/468-3420 <br /> JOHN TOUNGER <br /> RWL INVESTMENTS INC ply <br /> P O BOX 193765 <br /> SAN FRANCISCO CA 94119 6 199E, <br /> RE: D & A TRANSFER SITE CODE: 1274 <br /> 100 S VENTURA <br /> STOCKTON CA 95206 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Site Investigation Report" dated March 9, 1995, <br /> submitted by Oil Equipment Service, and has the following comments for your <br /> consideration. <br /> The alternative of excavation appears to be sufficient to remove the bulk of the <br /> identified soil contaminant plume. However, this approach alone does not address <br /> the groundwater contamination identified in the same area of impact. This issue <br /> should also be addressed at this time to avoid a potential costly long term r <br /> groundwater monitoring program and a delay at site certification. <br /> Therefore, PHS/EHD recommends the excavation be performed to remove all <br /> impacted soil, including any impacted soil beneath the water table. PHS/EHD also <br /> recommends the impacted water from the excavation be aggressively pumped, for as <br /> long as feasible, to reduce the levels of hydrocarbons in the water beneath the site. <br /> The large area proposed for excavation may allow for maximum recovery of <br /> groundwater at a rate and influence that may encompass the body of the <br /> groundwater plume. A similar efficiency may not be achieved by groundwater <br /> extraction wells installed at a later date. This alternative has been effective in <br /> reducing hydrocarbon levels at other sites with similar lithologies and impacts. <br /> In order to implement groundwater pumping concurrent with excavation, the removal, <br /> storage, and ultimate disposal of impacted groundwater must be considered. The <br /> groundwater may be stored on-site in a large tank for later disposal, or, as the levels <br /> at the site are not elevated, the City of Stockton may allow for a one time discharge <br /> to the sanitary sewer. For more information on this alternative, you may contact <br /> Larry Williams of the City of Stockton Municipal Utilities Department at <br /> A Division of San Joaquin County Health Care Services <br />