ARCHIVED REPORTS_MONITORING WELL INSTALLATION REPORT - SITE ASSESSMENT WORK PLAN

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' Historical Background: River City Petroleum and Connell Motor Lift Truck Page 3 of 13 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 apreliminary 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 10/11 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 collected two shallow soil samples under the concrete apron, one at the surface and one at ' a depth of 1.5 feet. Laboratory analysis detected elevated levels of diesel and what appeared • to be weathered gasoline;these levels were substantially reduced(90%)within the first foot of depth.Amherst concluded that limited subsurface contamination posed little threat to the 1 Advanced GeoEnvironmental,Inc.