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QUA RITRI.Y ONPTORINCREPOIZT FOiJRT1�tJARTER OF 1996 79101_ower Sacramento Road,Stockton,California Shell WIC No.204-7524.0806 Delta Project No.40.98-147 i Page 2 �. A precision tank test was performed during the summer of 1987 by Hunter Environmental on the three i s former underground storage tanks. The results,as discussed with the owner,did not indicate a problem with the tightness of the tanks. However,due to the age of the steel underground storage tanks,Shell decided to replace them with double-walled fiberglass tanks In December 1988. E On December 20, 1988,four steel underground storage tanks were excavated and removed from the site, ij kA tank closure report detailing tank removal activities was submitted to San Joaquin County(County) in April 1989. Three new 10,000-gallon double-walled Fiberglass underground storage tanks were installed on 3 ` December 22, 1988. Existin and former tank sizes,,type of product stored,age,and tank construction data i + are presented in Table 1. Tank Information Tank Size Product Approximate Construction . 1+, in�ailons Stored Ae in Years Tyyre Status ` - F 10,000 Super unleaded 2 Fiberglass Active10,000 t 10000 : Regular leaded 2 Fiberglass Active i Regular unleaded 2 Fiberglass Active 8,000 Super unleaded Unknown Steel Removed 8,000 Regular leaded Unknown Steel Removed 5,000 Regular unleaded Unknown. Steel Removed } 5,000 Regular unleaded Unknown Steel Removed f w jam. f AFroblentAssessmenrReporr was prepared by Delta and submitted to the County on October 5,1990. That ' report suggested that ground water monitoring be continued at the site for a period of one year to fully ; evaluate the potential for migration of the petroleum constituents from the soils in the area of the tank ! backfill to ground water underlying the site i \„tet .14