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<br /> PRELiMOIAR'Y SITE INVESTIGATION REPORT
<br /> ry GREYHO U?v'D'TERMINAL
<br /> STOCKTON,CALIFnRNIA
<br /> 11WRODUCTION
<br /> This report describes the site assessment implemented at the Greyhound Lines,
<br /> Inc. (GLI' 1 erminal, 121 South Center Street, Stockton, California (Figures 1 and
<br /> 2). The SCODe of work described was submitted to GLI in a letter proposal dated
<br /> August 16, !°91.
<br /> On September 16, 1991, a preliminary site assessment was initiated in
<br /> accordance with the approved Work Plan submitted to San Joaquin County Publt'c
<br /> Health Services, Environmental Health Division (SJCPHS/EHD). A total of five
<br /> soil borings were advanced. Soil samples from each boring were collected and
<br /> - analyzed for total petroleum hydrocarbon (TPHD and TPHG) and benzene,
<br /> toluene, ethylbenzene, and xylene (BTEX) to define both the lateral and vertiad
<br /> extent of soil contamination. Three of the soil borings were converted to
<br /> monitoring wells to characterize hydrogeologic conditions and groundwater quality,
<br /> The wells were monitored for the presence of free product accumulation and depth
<br /> to groundwater,and groundwater samples were collected from each well for TPHD,
<br /> TPHG and BTEX analyses.
<br /> PROJECT BACKGROIJND
<br /> Greyhound Lines, Inc. (GLI) operates a passenger bus terminal at 121 South
<br /> - Center Street, Stockton, California(Figures 1 and 2). As part of passenger terminal
<br /> operation, Greyhound utilized and maintained one 12,000-gallon underground
<br /> diesel fuel storage tank for the purpose of refueling buses. In May, 1991, GLI
<br /> initiated removal of this undergrour_r!. fael storage tank (UFST) and associated
<br /> piping. Soil samples were collected to assess the potential for environmental
<br /> contamination associated with the normal operation of the UFST. Samples
<br /> collected at the base of the excavation contained TPHD concentration; as high as
<br /> 4,200 mg/kg (TP-1, 14 feet below ground surface). In addition, soil samples
<br /> ^ collected from beneath the piping contained TPHD at concentrations which ranged
<br /> between non-detect and 11,000 mg/kg(P-S,2 feet below ground surface). Based on
<br /> these analytical results and the recommendations outlined in the State of California,
<br /> } Leaking Underground Fuel Tank (LUFT) Manual 1989, San Joaquin County
<br /> PHS/EP-D) requested additional investigations at the site to assess the extent and
<br /> magnitude of soil and/or groundwater contamination.
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