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' Lodi Ready Mix Page 3 <br /> Site Closure Report <br /> Project No. 93.1 <br /> May 12, 1995 <br /> • Soil Pile 3 TPH-Diesel-200 ppm <br /> • Soil Pile S Motor Oil-50 ppm <br /> The stockpile characterization work was reported in the November 12, 1991 <br />' GTI report-Characterization of Soil Stockpile. <br />' Additional site characterization work was requested by Ms. Laurie Cotulla of <br /> the PHS/EHD in her December 6, 1991 and April 15, 1993 letters. <br /> The procedures, protocol and methods of the subsurface investigation were <br /> proposed in the May 25, 1993 Work Plan- Soil Boring Installation prepared <br /> by Geological Technics Inc. The scope of work included drilling a soil boring <br /> as near possible to a former tank excavation soil sample collection point <br /> labeled RE-BS-25 feet. which tested positive for petroleum hydrocarbons Soil <br /> samples were proposed to be collected and tested at five foot intervals starting <br />' at 25 feet below ground surface to define the vertical extent of soil <br /> contarnination. Analyses of these samples would help determine if a <br /> groundwater investigation is warranted. <br /> MOn June 1, 1993 Mr. Tim McDonald of Geological Technics Inc. met with Mr. <br /> Mike Collins of the PHS/EHD to discuss the location for the confirmation <br /> ' boring. After consulting excavation maps and interviewing employees, both <br /> Mr. Collins and Mr. McDonald agreed that the location marked as SB-1 would <br /> be in a position to collect a soil sample as near as possible to where soil <br /> ' sample RE-BS-25 ft was collected. On June 7, 1993 Geological Technics Inc. <br /> submitted an Addendum to the May 25, 1993 Work Plan which detailed the <br /> position of SB-1. <br /> The work plan and addendum was approved by Ms. Cotulla of the PHS/EHD <br /> on June 18, 1993. <br /> 2.0 SUBSURFACE INVESTIGATION <br /> ' The May 25 1993 Work Plan <br /> and subsequent addendum proposed a <br /> ' subsurface investigation which was designed to collect evidence of the soil <br /> condition below 25 feet beneath the former UST excavation and remedial re- <br /> excavation. Information collected during this investigation is to be <br /> considered by the PHS/EHD to determine if a groundwater investigation is <br /> warranted. <br /> 1 <br /> 1 <br />