Laserfiche WebLink
' W <br /> { <br /> r <br /> ' 29 October 2002 <br /> AGE-NC Project No 98-0521 <br /> ' Page 2 of 4 <br /> ' collected from each well using a new disposable plastic bailer and were transferred Into three 40-m1 <br /> volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample <br /> 'preservative The samples were then labeled and placed In a chilled container for transportation <br /> ' under chain-of-custody to McCampbell Analytical Inc (MAI), a California Department of Health <br /> Services-certified laboratory Ground water samples were analyzed for the following <br /> ' Total petroleum hydrocarbons quantified as gasoline (TPH-g ) in accordance with EPA <br /> Method 8015 Modified, <br /> ' Benzene,toluene,ethyl benzene and total xylene(BTEX)and the fuel additives di-Isopropyl <br /> ether(DIPS),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- <br /> amyl methyl ether(TAME), tertiary butanol (TBA), methanol, ethanol, 1,2-dibromoethane <br /> ' (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> ' 3.0. FINDINGS <br /> The ground water flow direction and gradient were inferred from the field data Dissolved petroleum <br /> hydrocarbon Impact to groundwater was quantified by laboratory analysis of the samples collected <br /> 1i <br /> 3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> ' On 23 August 2002, the depth to ground water at the site ranged from 8 41 to 8 70 feet below the <br /> i tops of the well casings The ground water elevations at the site ranged from 8 09 feet (MW-1) to <br /> 8 37 feet (MW-2) below mean sea level (MSL) The ground water flow was directed toward the <br /> ' northeast with a hydraulic gradient calculated to be 0 013 foot/foot Depth to water and ground water <br /> elevation are summarized in Table 1 Figure 3 illustrates the contoured ground water elevations <br /> I <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> I <br /> The results of the August 2002 monitoring event are as follows <br /> 1 , <br /> • TPH-g was not detected in the samples collected from monitoring wells MW-1,MW-2,and <br /> MW-3 TPH-g was detected in the sample collected from monitoring well MW-4 at a <br /> concentration of 290 micrograms per'liter(µg/l) . <br /> I <br /> ' I <br /> I F <br /> Advanced GeoEnvironmental,Inc <br /> i I <br /> I <br /> I I I 1 i <br />