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Interim Site Assessment Report <br /> Village West. Marina <br /> W.W. Irwin Project (133016.00 <br /> RECOMMENDATIONS <br /> Based upon the field observations and analytical results, W.W. Irwin recommends that the <br /> following actions he taken: <br /> I. Due to the present concentrations of hydrocarbon constituents remaining within the south <br /> sidewall of the former tank pit, W.W Irwin recommends that further excavation and <br /> sampling be conducted in order to define the extent of contaminant migration in that <br /> direction. <br /> 2. W.W. Irwin recommends that additional excavation and sampling be conducted along the <br /> north wall of the former tank pit. However, due to the limited access to this area, it may <br /> become necessary to abandon in-place, the remaining Hydrocarbon contaminated soil. <br /> 3. Due to the presence of a Suspected confining clay layer at the base of Elie tank pit, W.W. <br /> Irwin recommends that no additional excavation of the pit bottom be conducted in order <br /> to,prevent the potential influx of ground water into the tank pit. <br /> 4. It is recommended, upon completion of the additional excavation, that the tank flit he <br /> backfilled to within 10 feet of the surface with a coarse gravel and innoculated with a <br /> preselected bio-formulation designed to reduce and degrade hydrocarbon contaminants of <br /> this type. Following innoculation, W.W. Irwin recommends that the remaining portion of <br /> the tank pit be backfilled with n clean fill material and compacted to code specifications. <br /> Finally, upon completion, of your review, it is recommended that copies of this report he <br /> submitted to Mr. Michael Collins at the Environmental Health Division of the San Joaquin <br /> County Public health Services, Stockton, and to the Central Valley Regiomil Water Quality <br /> Control Board, Sacramento. Addresses of these governmental agencies are attached for <br /> your convenience. <br /> Should you have -my questions regarding the information contained in this interim report, <br /> or if we rnav others-ise I-.,e of assistance, please contact our office at (800) 585-7085 or (2-09) <br /> 725-21185, <br /> Respectfully submitted, <br /> W.W. IRSVIN, INC. <br />