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1 <br /> selected as the preferred remedial alternative Since there was no impact to groundwater, no groundwater <br />' remediation was considered <br /> In February 1990 the Central Valley Regional Water Quality Control Board (RWQCB) reviewed <br />' the Soil and Groundwater Assessment QHKA, 1987), and the FS/RAP (Dames & Moore, 1988) The <br /> RWQCB agreed with the principal findings of the FS/RAP and requested a work plan for remediation <br />' of the site including additional groundwater monitoring wells The letter from the RWQCB dated <br /> February 16, 1990 is attached as Appendix F <br />' 2 5 SOIL REMEDIATION AND GROUNDWATER MONITORING WORKPLAN <br /> A Soil Remediation and Groundwater Monitoring Workplan(referred to as Workplan hereafter), <br /> for the site was prepared by Dames & Moore in April 1990, at the request of the RWQCB The <br /> Workplan detailed the selected remedial actions presented in the FS/RAP (Dames & Moore, 1988) The <br />' details of the Workplan included <br /> • Preconstruction Activities - Contractor selection, obtaining necessary permits, <br /> underground utility clearance <br /> • Site Clearing - Demolition of the maintenance shop and paved areas, debris removal, <br /> septic tank removal <br />' • Excavation and Site Restoration - Excavation, confirmatory soil sampling, transport of <br /> Soil to treatment site, backfilling <br />' • On Site Soil Treatment Plan - Chemical composition and regulatory classification of soil, <br /> treatability study, treatment system design and installation, treatment operation and <br /> maintenance, soil monitoring, disposition of treated soil <br />' • Groundwater Monitoring Plan-Well installation and development, groundwater sampling <br /> and analysis and reporting <br />' • Health and Safety Plan <br /> • Schedule <br /> In order to treat nonhazardous TPH impacted soils in California the Permit by Rule (Title 22, <br /> CCR) requires that the soil be classified as "non-hazardous" under Title 22 criteria for ignitability, <br /> corrosivity and carcinogenicity These tests were completed and the results are included in the Workplan <br /> (Dames & Moore, 1990) Diesel fuel has a relatively high boiling point, and is considered non-volatile, <br /> therefore treatment of TPH/D is permitted under Rule 409 9, Section D of the San Joaquin Air Pollution <br /> Control District <br /> SAC36 046 8 <br /> 1 <br />