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t 13 February 1998 AGE-NC Project No 95-0121 Page 2 of S from each well to fill ane-Inter amber bottles and three 10 5 ml 18%hydrochloric acid a 40-ml EPA-approved V air bubbles were not resent in the for the nam p OA vials containing p pies Care was taken to ensure that v,s,ble 1 were labeled with the well designation, date, Barn g and capping Ground water sample containers _ pier's initials 23 LABORA TORY AN4,LYSIS OF GROUND WATER SAMPLES AMPLES Each ground �atei sa,riple ,�as Logged on achain-of-custody form transported to a California state-certified laboratoi for an 8015M for total pets oleuni Ia}dt ocarbons quantified placed "'a chilled container and analysis ,n accordance with EPA method respectively), in accordance «,tI1 EPA method 8020 orvola elgasoline and di sel (TPH- benzene and xylene BTE&X) „jne,$ and TPH-d, nth methyl-tertiary butyl ether(MTBE),and in ccordano e with EPA Method 8260 for tertiary butanol (TBA), di-isop,opyl ether DIPS tert amyl methyl ether (TA, and to co,ifirm and { A 8020 The laboratory report {McCain bell A )� ethyl tent butyl ether(ETRE)and F Analytical IncnL b I D 83402 to 93410) EPA Method custody forms are Presented in Appendix B, the results of the analysis }and able 2chain-of- Y are contained in Table 2 3.0. FINDINGS 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT The depths to ground Ovate, font «ells MW_ through MW-9 E 20 88 feet below the tops oft ` were the, Well casing measured between I9 02 and water elevation 111creased an a erage 1 $5 feet at the site The groundwater cs Between August 1997 and November I997, ground _ though MW_9 during November's ground t{ater monitoring eve elevation data for MW-I During the No�e,nbei 1997,�ion�tortn� nt is depicted �n Figure 3 the a event, screened ,ntei vals til mo,t,toring LveI]s BMW water was between 2 98 and 12 50 feet above "drowned", and play not be fully representative - ground through MW-9 saturated zone 1t here fuel ht Presentative w Therefore, the wells are ould be expected to have the greatestditions near n tate top of the I P In November 1997, the gradient was calculated to be 0 006 (Fide 3) Ground water inon,tor,ng data collected in the areaof' or approximately,32 feet per mile MW-7 Suggests that rile ground water flow MW-1, MW-? monitoring data collected In the area e MW-5,direction was toward the nbrtheast, ground and flow direction, A,as toward the east, ground Water n on monitoring suggestse ground water MW-z, MW-4 that the ground waren MW-5 and MW_$ suggests that the ground gwater flow de echo e area of MW-',, ' north ,est Due to` the relatively flat gradient at the site was toward the any slight variations ground water J Adr'QrrcerlGeoErt�manrrtec�ta! !nc