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i V Quarterly Report - 152 East 1 Ith Street, Tracy Page 4 iBeginning on March 19, 1996, the remedial excavation that had been opened on the 152 East I Ith Street site was backfilled to within 2 feet of the ground surface with Caltrans Class II granular base material compacted to a minimum relative density of 90 percent Anticipating that, as provided for in the CAP, it may be advantageous to pump a moderate volume of groundwater from the area of the excavation and treat it before discharge to the municipal storm sewer under authority of RWQCB General Order No 92-15025, a groundwater extraction sump was installed in the backfill and two 20,000 gallon, mobile storage tanks and a pair of granular activated carbon treatment units were brought to the site and set up Following an evaluation of the geotechnical and geochemical data and the finding tht the source of the gasoline affecting the 152 East I 1 th Street site was off the property and down the groundwater gradient, and based on guidance received from the SJCPHS, the motile sorage tanks and carbon units units were later de-mobilized In the opinion of the SJCPHS representative, with which opinion the professional engineer in responsible charge of the remediation program concurred, because all contaminated soil had been successfully removed from beneath the property, and the source of the unauthorized release of fuel hydrocarbons had been found to be located off the site to the north and down the groundwater gradient beyond the site limits, further active remediation of the subsurface beneath the subject property would not be cost-effective, or necessary for • closure of the site in accordance with the applicable regulations Also, such pumping would draw groundwater containing high concentrations of gasoline into the subsurface beneath the 152 East 1 lth Street site from which contaminated soil had been successfully removed and replaced with clean, imported fill Engineering and Status Reports The following status report was completed during the reporting period and submitted to the SJCPHS 1 Quarterly S atus Report. November 1. 1995 to January 31, 1996 - 152 East l ith. Street- Iracy- California, Submitted February 22nd 1996 4 s CopN transmitted to the California Regional Water Qualitt Control Board - Central Valla Region (CRWQCB) Petroleum Underground Storage Tank Cleanup Fund As the present property owners, the Navarras applied to the California State Water Resources Control Board (SWRCB) under the Petroleum Underground Storage Tank Cleanup Fund for a grant to meet the cost of investigating and remediating the site On December 29th 1994, the SWRCB issued an initial Letter of Commitment for Reimbursement of Costs to the Navarras