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,CV(ATC <br /> A S Sino C I A T E S I N C <br /> 3.0 BACKGROUND <br /> 1 BJJ Company, Inc operates a truck ternunal facility at the subject site Three underground fuel storage <br /> tanks are maintained at the facility Two of the tanks are newly installed double walled tanks used to <br /> contain diesel for company trucks These tanks are located near the facility entrance The other tank is <br /> 1 a 3,500 gallon underground tank located partially beneath one of the maintenance buildings Due to <br /> the location of the tank, BJJ Company, Inc requested and received conditional approval for in-place <br /> 1 abandonment from the Montezuma Fire Protection District Figure 2 depicts the tank and piping <br /> locations relative to other facility features <br /> 1 On June 15, 1990, Waterwork Corporation personnel advanced two angled soil borings (ASB-1 and <br /> ASB-2)beneath the existing tank The location and orientation of the borings are depicted on Figure <br /> 2 These borings were advanced at 45°from vertical and ternunated beneath the longitudinal centerline <br /> 1 of the tank approximately 5 feet beneath the tank bottom Soil samples were collected and analyzed <br /> for total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015, benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) by EPA Method 8020, ethyl dibromide (EDB) by EPA <br /> Method 8010, and total lead by LUFT Method <br /> Analytical results of soil samples collected from boring ASB-1 showed elevated concentrations of <br /> petroleum hydrocarbons at the fill end of the tank Laboratory analysis of soil samples collected from <br /> ASB-2 at the opposite end of the tank recorded very low levels of contamination The absence of <br /> significant contamination at this end of the tank indicated that soil contamination was localized at the <br /> ' fill end of the tank Soil analytical results are summarized in Table 1 The results of the investigation <br /> were presented in Waterwork's Underground Fuel Tank Abandonment Contaminant Assessment <br /> Report, dated July 30, 1990 <br /> 1 On January 15, and 16, 1991 to further define the vertical extent of contamination, Waterwork <br /> personnel supervised the advancement of two additional angle soil borings (BJJS-ASB 1 and BJJS- <br /> 1 ASB2) beneath the existing tank Borings BJJS-ASB1 and BJJS-ASB2 were advanced at 45° from <br /> vertical and terminated beneath the longitudinal center-line of the tank approximately 22 5 feet, 37 feet <br /> ' respectively, beneath the tank bottom One vertical soil boring (BJJS-SB3) was also advanced to <br /> investigate the extent of the contamination Boring BJJS-MWI was completed as monitoring well <br /> MW 1 and was installed east of the tank to provide information on water quality at the site The <br /> location and orientations of the soil bonngs and monitoring well are depicted on Figure 2 <br /> Petroleum hydrocarbon analytes were not present at or above method detection limits in the soil <br /> ' samples collected from well MW 1 The soil samples collected from BJJS-ASB 1 and BJJS-ASB2 <br /> contained detectable concentrations of petroleum hydrocarbons The soil samples collected from <br /> BJJS-SB3 contained very low concentrations of petroleum hydrocarbons Soil analytical results are <br /> 1 summarized in Table 1 <br /> w 194304WpodA\ciog=doc 2 <br /> 1 <br />