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Interim Site Assessment Report <br /> Village West. Marina <br /> W.W. Irwin Project 033016.00 <br /> RECOMMENDATIONS <br /> Based upon the lield observations and analytical results, W.W. Irwin recommends that the <br /> following actions he taken: <br /> 1. 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 he 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 he 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 the tank pit, W.W. <br /> Irwin recommends that no additional excavation of the pit bottom he 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 pit be <br /> s 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 a. clean fill material and compacted to code specifications. <br /> Finally, upon completion of your review, it is recommended that copies of this report be <br /> submitted to i14r. Michael Collins at the Environmental Health Di�,ision of the San Joaquin <br /> County Public health Services, Stockton, and to the Central Valley Regional Water Quality <br /> Control Board, Sacramento. Addresses of these governmental agencies are attached for <br /> your convenience. <br /> Shoul,l you have any q«estions regarding the information contained in this interim report, <br /> or if we may otherwise be of,assistance, please contact our office at (800) 585-2085 or {209} <br /> 725-2085, <br /> Respectfully submitted, <br /> W.W. IRIViN, INC. <br /> S <br />