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A Appendix A - Historical Background River City Petroleum and Connell Motor Lift Truck Page 3 of 14 and 9) The location of the UST was documented to be at the south and north ends of the truck lube bay No soil sample data was available from the UST removal and AGE is not aware whether or not an authorized release had been observed or documented • The service area included two fuel islands, each with three fuel dispensers (two diesel and one gasoline) The USTs were north of the fuel islands • On 10 September 1997,Stockton Fire Prevention filed documentation for a hazardous waste discharge from an accidental drive off that resulted in the release of approximately 15 gallons of diesel fuel from pump#1 (pump island#2) Action was taken to apply absorbent material and sweep up, and the pump nozzle was locked down Note was made that the concrete near the pump was settling and broken and that further site assessment would be required In addition,an EHD investigation of the spill also noted diesel fuel puddled under the cracking concrete near the west dispenser,this resulted in an abatement notice requiring that the diesel fuel should be removed and properly disposed of and that further site assessment was required to investigate the source of the diesel fuel release and the extent of contamination • On 24 September 1997, Amherst Inc completed a preliminary site assessment (18 . September 1997 visual inspection) for diesel contamination of soil under one of the pump islands Amherst proposed to develop a work plan to determine the extent of the contamination Work was later performed to assess soil for contaminates released from the dispenser • On 28 October 1997,an EHD UST Unauthorized Release(Leak)/Contaminated Site report changed the case type from a soil-only release to undetermined and the EHD issued a letter to Connell Motor Trucking requiring further assessment of soil and groundwater contamination • In February 1998, an EHD site inspection discovered that the vapor recovery system was inoperable and shut down the gasoline dispensing system pending repair of the system • On 9 March 1998, Connell Motor Truck terminated their lease with River City Petroleum citing economic hardship with regard to the required repairs The UST system did not operate after that time • On 20 March 1998,a routine EHD inspection found that the dispensers had been removed, the concrete islands had been broken,and tanks 5,6 and 7 had been improperly abandoned, in addition,the site was in violation of the 10/1 l September abatement order A hearing was scheduled for after 30 April 1998 • On 7 April 1998,Amherst Inc issued a site status memo on the spill assessment, this memo referenced an 11 November 1997 work plan for a site assessment that was not in the files reviewed and an 05 December 1997 verbal approval of the work plan According to the . memo,severe weather had postponed assessment until 13 March 1998,on that date Amherst Advanced GeoEnviron mental,Inc