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1 <br />' Appendix A <br /> Preliminary Site Assessment Report <br />' Interim Soil Remediation Report <br /> FIRE STATION #2 - South UST Area <br />' On 08 and 15 July 2002, a total of five soil borings were advanced at the site The soil borings were <br /> advanced using a Geoprobe 5400, equipped with 2 25-inch diameter hollow-stem rods and <br />' associated sampling tools <br /> Soil pilot borings Pl, P2, P3, P4 and P5 were advanced to depths of 50 feet below surface grade <br />' (bsg) for ground water sample collection and soil sample collection and soil pilot boring P2 was <br /> advanced to a depth of 30 feet bsg Soil samples were collected from 5 feet to 30 feet bsg in soil <br /> probe borings P1, P2, P5 and from 5 feet to 50 feet bsg in boring P3, while no soil samples were <br />' collection from soil probe boring P4 Soil samples were collected from the probe boring using a <br /> Geoprobe soil sampling device A grab ground water sample was collected from each probe boring <br /> location A Geoprobe water sampling assembly was advanced to a depth of 30 feet in boring P2,and <br />' 50 feet bsg in the remaining borings <br /> The selected soil samples and each water sample were subsequently transported in a chilled container <br />' under chain-of-custody to a California Department of Health Services (DHS)-certified analytical <br /> laboratory, selected samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as diesel and selectively TPH-oil (TPH-d and <br /> TPH-o) by EPA Method 8015 Modified, <br />' a Benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA Method 8021 and <br /> o Total or Dissolved lead in accordance with EPA methods 6010 Modified <br /> I <br /> STRATIGRAPHY AND DEPTH TO GROUND WATER <br /> ISilt and clay with a tan or gray color,apparently depending on hydrocarbon impact,was encountered <br /> from a depth of approximately 5 feet to 28 feet bsg Gray to tan sand with gravel was present <br />' between 28 feet and 30 feet bsg Silt and clay was encountered again from 30 feet to 50 feet bsg <br /> Ground water was encountered at a depth of 30 feet bsg during drilling <br /> { <br /> ANALYTICAL RESULTS OF SOIL SAMPLES <br /> ITPH-d was detected in soil samples collected from boring P1 at depths from 5 feet to 20 feet bsg, <br /> the maximum concentrations of TPH-d as well as TPH-o, were 1,700 milligrams per kilogram <br /> I (mg/kg)and 3,300 mg/kg,respectively in sample P 1-10 Based on the analytical results from the soil <br /> samples,AGE calculated that an estimated 311 kg of diesel and 509 kg of fuel oil remain in the soil <br /> at the site The calculations to determine the hydrocarbon mass in the soil is presented <br /> Advanced GeoEnvironmentail,Inc <br />