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Remediation Report - 152 East 1 Ith Street, Tracy, California Page 8 The results from the November 15, 1995 round of groundwater sampling and analysis were used to support an application for authorization to discharge, under the terms of National Polluted Discharge Elimination System (NPDES) Permit No CA0082929, any treated groundwater that it might be necessary to generate to effect the remediation program That application was submitted to the CRWQCB California, on February 12, 1996 in the form prescribed by that agency's Order No 92-150 The CRWQCB approved the application and authorized the discharge under General Order No 92-15025 on March 7, 1996 DEMOLITION AND SITE CLEARANCE In December 1995, preparatory to remediation, authorization to temporarily close the sidewalk on the F Street frontage of the 152 East I Ith Street property and to encroach onto the sidewalk on the East 11th Street frontage, as was necessary to implement the remediation program, was obtained from the City of Tracy who issued an encroachment permit for that purpose A demolition permit was also obtained from the City of Tracy to authorize demolition of the structures on the property Underground utilities situated beneath the site and the adjacent streets were located and marked by the United Services Agency (USA) Water, electricity and gas services to the site were shut off by the concerned utility providers When the requisite permits had been obtained the building that had, prior to the 1978 purchase of the site by the Navarras, served as an automobile-service shop and gas-station office was demolished, together with the associated fore-court canopy and other, minor site infrastructure Except for small quantities of general debris, that were disposed at a permitted landfill, all of the material generated by the demolition, including structural steel, bricks, metal siding, concrete from foundations and slabs and bituminous macadam paving were carefully segregated by type and shipped to appropriate facilities for recycling in beneficial use SEALING OF MONITORING WELLS Before remedial excavation work was initiated, groudwater-quality monitoring wells NAV-I and NAV-3 were sealed from bottom to top with tremied Portland-cement grout These wells were within the area from which contaminated soil was to be excavated Their locations are shown on Figure 2 They were destroyed under the oversight of the SJCPHS that issued Permit No 008536 for the work on February 12, 1996 The required well destruction records have been filed with the California Department of Water Resources ' REMEDIAL EXCAVATION The site was secured by a six-foot high chain link fence and excavation to remove contaminated soil from beneath the site began on February 13, 1996 A Komatsu PC2000- LC-5 excavator equiped with a 44-in bucket, supported by a Case 821 front loader with a