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' 09 June 2000 •': AGE-NC Project Na. 98-0468 ° ' Page 2 of 4 ' 2:2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each monitoring well using new disposable bailers after allowing % the wells to achieve a minimum 80recovery of the pre-purge water volume. The samples were transferred into 40-m1 EPA-approved vials containing 0.5 ml 18% hydrochloric acid as a- ', preservative and i-liter amber bottles without a sample preservative. The sample vials were then labeled with the monitoring well designation, date, time of sampling and the sampler's initials. The samples were transported in a chilled 'coniainer under chain of custody to -Alpha Analytical ' . Laboratories Inc. (AAL), a California Department of Health-Services (DHS)-certified analytical laboratory for analysis. The samples were analyzed for: '' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015-Modified, • Total petroleum hydrocarbons quantified as diesel (TPH-d) in accordance with EPA Method 8015 Modified, Volatile aromatic compounds; specifically benzene, toluene, e.thylbenzene, and total xylenes • (BTEX)with methyl tertiary butyl ether(MTBE)in accordance with EPA Method 8020, and Oxygenated fuel additives: MTBE,tertiary butyl alcohol (TBA); di-isopropyl ether(DIPS), ethyl tertiary butyl ether(ETBE) and tertiary amyl methyl ether(TAME) in accordance with EPA Method 8260-Modified. ' -of- .wfield to the . Chain custody protocols were used to document sample custody transfers from the f analytical laboratory. Sample chain-of custody forms and .laboratory reports are provided in ' Appendix B. ' 3.0. FINDINGS Groundwater elevation and flow direction were calculated from field data; hydrocarbon-impact to ; i ' ground water was inferred from laboratory analysis of the ground water samples., 3.1. GROUND WATER ELEVATION AND FLOW DIRECTION i ' 'The During.the April 2000 monitoring'event, the depth to ground water at the site ranged from 7.04 to 7.53 feet below top of well casings (btoc) (Table'.1). Ground water elevation at the site.rariged' from•0.15 to 0.45 feet below mean sea level (MSL). Ground water elevation in the monitoring wells Advanced GeoEnvironmental,Inc.