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" - 20 July:1998 1; AGE-NC Project No. 95-0109 r I ; : Page 2 of 4 ; 2 3 COLLECTION OF,GROUND WATER'SAMPLES, " Water'samples were collected'from each purged...'well,u_sing disposable.plastic bailers. Immediately upon retrieval,the samples were transferred into 40-m1 EPA-approved VOA vials confamning'0:5'ml 18%hydrochloric:acid as.asample preservative. The samples were labeled, stored;and-transported. in'a,chilled.container under chain-of custody to WCampbell Analytical,-Inc. (MAI).in Pacheco, California. All samples were analyzed for: • Total petroleum hydrocarbons lquaritified as, gasoline (TPH-g) ,in accordance with EPA ; Method-5030'/8015m; •::•Volatile .organic..compounds'(benzene,'.toluene, ,ethylbenzene•'and xylenes; BTE&X) iri accord,. e with EPA'Method 602; and •' Volatile•organic compounds with oxygenated compounds in accordance with EPA Method _ ' '8260: Samples were also collected from'MW-9 and MW44 and placed in 40=m1 VOA vials with no added preservative: These two samples were.placed'in"a•chilled container and transported under chain-�f- custody to.A. Keith. Kaufman, M.S.,".iri Culver City, California:'These samples were analyzed for physicochemical properties and microbiological enumeration. , 1 ; 3.0. : ,FINDINGS 3.1. GROUND WATER:GRADIENT AND DIRECTION ' The depth'to'ground water,ranged from 5'1.3.feet below surface grade (bsg) north of the site.to 53.1 feet'bsg south of the site.The,data indicates an average-2.16 feet increase,of grouhdwater elevation' since 1vlarch 1998. Ground water elevations are summarized on-Table 2. S Ground waterelevation:contours, based upon data collected on 09June.1998' 'are depicted in Figure _ 3. Ground water e18vationSrfbr'K1W-1'thr6ugh N1ViW-5-were..]ovver than the surrounding Wells. The ; ared`to deeper wells':`" ' „ small amount of water.In these wells, themr poor.recharge charactenstics comp p 1 , �on the site,.and;their-aberrant�ground_water elevations strongly suggest that these wells do not_'have ' ' good hydrologic communication,with the monitored aquifer; therefore data.from. these five wellsµ , were not used=to determilae the ground water flow direction.-The inferred ground'water flow, direction is coward'the south and,'as,ih,pr"evious monitoring.'events, the gradient steepens°south of ' h- • y' .the.Srte• • '; " 1 1 ., _ , . - ' • . - ` Y 1' Aihanced GcoEnvironmental,Inc.