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Geological Technics Inc. Page 2 <br /> C&B Equipment <br /> Monitoring Well Installation Report <br /> <> r Project No. 336.2 <br /> November 13,1995 <br /> `f <br /> 1.0 SITE HISTORY <br /> The C & B Equipment site at 7474 West 11th Street in Tracy was purchased from <br /> Holt Brothers in 1966. C & B Equipment operates the site as a repair facility, and <br /> conducts equipment and parts sales. <br /> On June 2, 1988, Jim Thorpe Oil, Inc. removed two UST's; one 550 gallon capacity <br /> diesel tank and one 1,000 gallon unleaded gasoline tank. The San Joaquin County <br /> Public Health Services Environmental Health Division (SJCPHS/EHD) inspector Mr. <br /> `I Jaime Favila reported that the diesel tank appeared intact but the soil around it was <br /> - � discolored and exhibited an odor. The gasoline tank was observed to have two one- <br /> half inch holes in it at the west end. Odors and discoloration were evident <br /> throughout the tank excavation. Groundwater was encountered at 8.5 feet and two <br /> soil and one groundwater samples were recovered from beneath the former tank <br /> locations. <br /> i <br /> Elevated concentrations of gasoline range and low concentrations of diesel range <br /> -_ petroleum hydrocarbons were detected in the soil sample collected from the west <br /> =, end of the gasoline tank excavation. Approximately 16 cubic yards of soil were <br /> removed from the excavation. <br /> `:-_� On March 15, 1995 the SJCPHSEHD directed that C & B Equipment submit a work <br /> plan to further investigate the extent of contamination at this site. On June 12, 1995 <br /> Geological Technics Inc. was contracted to prepare a work plan. <br /> On June 21, 1995 the Work Plan was approved by the SJCPHSEHD. <br /> On July 25, 1995 Geological Technics Inc. personnel directed a preliminary <br /> subsurface investigation which is documented in the following sections of this <br /> report. <br /> 1.1 Project Chronology <br /> _. 1988 <br /> 6/88 UST's removed and soil samples collected <br /> -- 1995 <br /> 3/95 SJCPHSEHD directed that a work plan be submitted <br /> I 6/96 Work plan submitted and approved <br /> 7/95 Three monitoring wells MW-1, MW-2, & MW-3) installed <br /> 7/95 Collect a round of groundwater samples <br /> i <br />