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1 <br /> 31 January 1997 <br /> AGE-NC Project No 95-0125 <br /> Page 5 of 7 <br /> 3 2 GROUND WATER SAMPLE COLLECTION <br /> On 05 November 1996, ground water samples were collected from monitoring wells MW-1, MW-2, <br /> MW-5, MW-6 , MW-7, MW-8, MW-9 and MW-10 These monitoring wells were sampled in <br /> accordance with the request of the PHS-EHD <br /> Samples were retrieved from the wells using new disposable plastic bailers Each sample was <br /> collected in 40-m1 EPA-approved VOA vials and transported in a chilled container, under a chain-of- <br /> custody, to Alpha Analytical Laboratories, Inc (AAL) in Ukaih, California <br /> Each sample collected was analyzed for total petroleum hydrocarbons quantified as gasoline (TPH- <br /> g), volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) with methyl tert-butyl <br /> ether (MTBE) in accordance with EPA methods 5030/8015m and 602, respectively <br /> 3 3 SOIL AERATION AND SAMPLING <br /> Approximately 250 cubic yards of excavated soil was transferred into an aeration cell on the western <br /> portion of the school property An authorization for the uncontrolled soil aeration was granted by <br /> the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) <br /> Five soil samples were collected from the stockpiled soil excavated from the former USTs area to <br /> verify the effectiveness of the soil aeration treatment Soil samples were collected from two feet <br /> below the surface of the stockpiled soil Soil samples were collected with a metric soil sampling <br /> hammer, loaded with two 2 by 3-inch clean brass sampling sleeves Soil in the lead sample sleeve <br /> was preserved for laboratory analysis both ends of the lead sleeve were covered with Teflon sheets, <br /> capped and sealed with tape <br /> The samples were stored in a chilled container and transported under chain-of-custody to AAL <br /> Each sample collected was analyzed for TPH-g ,and BTE&X with MTBE in accordance with EPA <br /> methods 5030/8015m and 602, respectively <br /> 4.4. FINDINGS <br /> 41 GROUND WATER ELEVATION AND GRADIENT DIRECTION <br /> When measured on 05 November 1996, the depth to ground water at the site ranged from 7 75 to <br /> 8 42 feet bsg The relative ground water elevation at the site decreased approximately 0 16 feet <br /> between June and November 1996 The relative elevation of ground water in each well was <br /> E <br /> E <br />