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TABLE 1 <br /> DERICKSON TRUCKING <br /> PRELIMINARY SITE ASSESSMENT ANALYTICAL RESULTS in ppm <br /> OCTOBER 1, 1992 <br /> ETHYL TPH TPH TOTAL <br /> SAMPLE LOCATION B9�NE TOLUENE BB�VE1X_YLENES diesel as EDB LEAD <br /> 12000 GALLON DIESEL TANK <br /> T1 A North End ND ND 0.9 5.616.5 <br /> T113 Center ND ND ND ND 12.8 <br /> TIC South End ND ND ND _ ND ND <br /> 2000 GALLON GASOLINE TANK <br /> T2A I North End ND ND ND ND ND ND ND <br /> T2B South End ND ND ND ND ND ND ND <br /> 2000 GALLON WASTE OIL TANK <br /> T3 A East End ND ND ND ND Np ND <br /> T3$ West End ND ND ND ND ND ND <br /> Analytical Method: BTEX, TPH (gasoline) - EPA 8020; TPH(diesel) - EPA 8015M <br /> Minimum Detection Limit: BTEX- 0.005 mg/kg; TPH(gasoline), TPH(diesel) - 1.0 mgkg <br /> ND -None Detected <br /> Following a review of these analytical results, the San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) required a full assessment to i <br /> determine the extent of the soil and/or groundwater problem related to the diesel tank i <br /> (Letter dated November 2,1992). <br /> 4.0 Site Characterization Procedures <br /> The Site Characterization phase-of the project was conducted on March 15 and 16, <br /> 1993. Four soil borings were drilled adjacent to the former diesel tank to investigate <br /> the impacted area indicated by the preliminary sampling. One 10 foot boring was <br /> drilled at the site of the former waste oil tank to .retrieve an additional sample below the <br /> tank at the request of the San Joaquin 'County DHS/EHD. The borings were drilled <br /> using a hollow stem auger drilling rig owned by Soils Engineering Inc. (SEI) under <br /> contract to AGI. <br /> 4.1 Boring Methods <br /> Five soil borings (Borings D-1 to D-5) were advanced using a CME-75 rig with an eight <br /> (8)-inch outer diameter hollow stem continuous flight'auger in accordance with ASTM <br /> Method D1452-80 for soil investigations and sampling by auger borings. The <br /> maximum depth reached was 40 feet. All borings were drilled vertically with the <br /> exception of Boring D-1 , which was advanced at a 30 degree angle under the former <br /> 4 <br /> = i <br />