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i � p M 24 January 2006 '`=? AGE-NC Project No. 97-0360 ' Page 2 of 4 containing 0.5 ml 18% hydrochloric acid solution as a sample preservative, and into one 1-liter �. a amber bottle without preservative. After collection, the samples were properly labeled,placed in a chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories - (CTEL), a California Department of Health Services (DHS)-certifted analytical laboratory. The samples were analyzed for. • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015M; and ,.. Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fuel additives methyl tertiary- butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), tertiary- amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB), and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B. E; 3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 01 September 2005. The hydrocarbon-impact to groundwater was quantified from laboratory analysis of the ground water samples. V! {{ j 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION FJ At the time of the September 2005 sampling event,depths to ground water in wells MW-1 through ,l MW-5 and EW-1 ranged from 7.10 feet(EW-1)to 9.45 feet(MW-2)belowthe well heads.Average F; ground water elevation at the site(excluding MW-2)was approximately 3.99 feet above mean sea level(MSL;Table 1). Ground water elevations at the site increased an average of 1.90 feet since the June 2005 monitoring event. The ground water flow direction was inferred using ground water elevation data from the monitoring wells on-site. Well MW-2 was not used to determine ground water flow direction or gradient ' because it is screened at a deeper interval than the other wells. Ground water flow was inferred to be flowing toward the southwest at a gradient of approximately 0.005 foot/foot (ft/ft). Figure 3 illustrates the contoured ground water elevations as measured on 01 September 2005. 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES No analytes were detected at or above Iaboratory reporting limits in any of the ground water samples Advanced GeoEnvironmento],Inc. I :i