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Tl <br /> PROPOSAL FOR <br /> PROFESSIONAL ENGINEERING SERVICES <br /> GROUNDWATER REMEDIATION AND SITE CLOSURE <br /> TRI VALLEY GROWERS - PLANT T <br /> THORNTON, CALIFORNIA <br /> T. <br /> SECOR International Incorporated (SECOR) is pleased to respond to your request for proposal for <br /> remediation and closure of soil and groundwater affected by petroleum-hydrocarbons at the Forklift <br /> Shop, located at Plant T in Thornton, California (Site). Our approach described in the following <br /> proposed Scope of Services includes: <br /> • Continuation of the Quarterly Monitoring Program, with modifications, <br /> Preparation arid negotiation of a Final'Remedial Plan: <br /> Several additional work elements would follow these initial tasks, contingent upon regulatory <br /> approval. These efforts would include: <br /> • Installation of,a simple groundwater extraction system, <br /> • Establishment'of a bioremediation cell for the management of soils affected by <br /> petroleum hydrocarbons, <br /> Installation of-a cost-effective treatment system for extracted groundwater. <br /> Following a requisite number: of groundwater monitoring events which indicate reduced <br /> concentrations of benzene detected in samples collected from well MW-4, to concentrations <br /> acceptable to PHS/EHD, a Site Closure Report will be prepared, in accordance with 'RWQCB <br /> guidelines. <br /> BACKGROUND <br /> We have reviewed reports prepared regarding previous soil and groundwater investigations which <br /> have been conducted at this Site. Five underground storage tanks (USTs) were removed from the <br /> Site in February 1987. Reportedly, four tanks had previously contained gasoline; the fifth,had i <br /> previously contained #6 fuel oil. 1 <br /> Tri Vallev Growers1 SECOA` <br /> NI I30P-rpr June I,1995 <br /> I <br />