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SITE INVESTIGATION WORKPLAN <br /> the stockpiled soil. The four other oxygenates: Diisopropyl Ether (RIPE), Ethyl-t-butyl Ether <br /> ' (ETBE), tert-Amyl Methyl Ether(TAME), and tert-Butanol were not detected in the soil samples. <br /> For this reason MTBE is considered the constituent of concern for the proposed assessment. The <br /> soil sampling analytical results are presented below in Tables 1 and 2. <br /> TABLE 1 <br /> ' (SHERWOOD LABS) <br /> RESULTS OF SOIL SAMPLES COLLECTED ON APRIL 7,2000 (PARTS PER BILLION) <br /> SAMPLE SITE TPHG BENZENE TOLUENE ETHYL- XYLENE MTBE <br /> BENZENE <br /> DTU-Ti N-13' <1.0 <3.0 <3.0 <3.0 25 16000 <br /> DTU-T1 S-13' <1.0 <3.0 <3.0 <3.0 <3.0 15300 <br /> DTU-SP-A1/A2 <1.0 <3,0 <3.0 <3.0 <3.0 133 <br /> (composite) <br /> DTU-SPB <1.0 <3.0 <3.0 <3.0 4 89 <br /> DTU-SPG <1.0 <3.0 <3.0 <3.0 7 12200 <br /> TPHg= Total petroleum hydrocarbons as gasoline <br /> MTBE=Methyl tertiary-butyl ether <br /> <1.0=concentration less than indicated laboratory reporting limit <br /> ' TABLE 2 <br /> (ENTECH ANALYTICAL LABS, INC.) <br /> CONFIRMATION ANALYTICAL RESULTS(PARTS PER BILLION) <br /> SAMPLE SITE MTBE D1PE ETBE TAME TERT- <br /> BUTANOL <br /> DTU-T1 N-13' 6600 <250 <250 <250 <1000 <br /> DTU-T1 S-13' 11000 <500 <500 <500 <2000 <br /> DTU-SP-A11A2 <5 <5 <5 <5 <20 <br /> (composite) <br /> DTU-SPB 45 <10 <10 <10 480 <br /> DTU-SPC 2600 <500 <500 <500 <2000 <br /> MTBE=Methyl tertiary-butyl ether <br /> ' DIPE=Diisopropyl Ether <br /> ETBE=Ethyl-t-butyl Ether <br /> TAME=tert-Amyl Methyl Ether <br /> <5=concentration less than indicated laboratory reporting limit or"non-detect' <br /> ' HYDROGEOLOGY <br /> Site hydrologic characteristics were obtained from the Ground Zero Analysis, Inc. Underground <br /> Storage Tank Closure Report dated April 26, 2000. The site is located in the San Joaquin Valley, <br /> within the Great Valley Geomorphic Province. Based on the soil materials encountered during <br /> the UST removal, shallow soil layers underlying the site consist primarily of brown silt. <br /> Groundwater was not encountered in the excavation at the maximum depth explored of <br /> Environmental Science Associates 3 Universir}of the Parifrr Site fnvesrigation Work Plan <br /> June 2000 200252 <br />