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14 <br /> t 5 <br /> 04 October 1996 T <br /> i <br /> AGE-NC Project Na" 950121 � � <br /> Page 2 of 431 <br /> wl <br /> to sample collection "Water'samples were collected from wells MW- through <br /> ocol�echte in one- <br /> liter <br /> lit e - Y" <br /> dedicated, disposable polyethylene bailers and new nylon rope Same s <br /> amber bottles and 40-ml EPA vials containing hydrochloric acid as a preservative Care was taken <br /> to ensure that visible air bubbles were not present in the VOAs after filling and capping AGround ' <br /> water sample containers were labeled with the well designation, date, time, and the sampler's initials <br /> i, <br /> •• , 4 r <br /> 12 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES ; <br /> f-custody form, placed in a chilled container and <br /> Each ground water sample was logged on a chain-o <br /> transported to a Castle Analytical Labora#Dries (CAL), a California state-certified laboratory` for <br /> fo `Total Petroleum Hydrocarbons <br /> analysis of hazardous materials Each sample was analyzed r <br /> quantified as gasoline and diesel (TPH-g and TPH-d), volatile aromatics (benzene, toluene,`ethyl <br /> iviTBB in accordance with f <br /> benaene and xylenes BTE&X) amethyl-tertiary <br /> yart(CAL Laboratory No 850) and chain-of-custody ` <br /> appropriate EPA methods The laboratory report <br /> forms are presented in Appendix B <br /> r _ <br /> 3.0. FINDINGS <br /> 3 1 RELATIVE'GROUND WATER ELEVATION AND GRADIENT <br /> wells MW-i through MW-9 ranged between 20 89 and 22 88 feet <br /> The depths to ground water in_ round water elevation dropped , <br /> ' below the top of each well casing Between May and August 199 &, g <br /> It an average of 0 81 feet at the site , <br /> 1 ' <br /> round water was between one and eleven feet above the top of <br /> During the August 1996 sampling, g { ,w <br /> the screened intervals in the each monitoring wells 1 a ' <br /> Ground water flow direction at `the site is generally toward the northeast at a gradient of <br /> s a raximatel 0 002, or approximately 13,feet per mile (Figure 3 - Surface Ground Wafer Elevation <br /> pp y <br /> 1 <br /> 1 <br /> Contour Map) , 1 <br /> Y r , <br /> t I Y <br /> ,3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> , r 'J ' 1 t <br /> �Y <br /> TPH g was detected in water samples from MW-1 through MW'-4 and <br /> at concentrations as <br /> micro rams per liter or parts`per billion `ppb} TPH-d was detected in samples' '"" <br /> high as 41,000 ggd{ g p - <br /> collected from each well at concentrations ranging up to 20,000 ppb �I <br /> as 11 Q00 b benzene, <br /> BTE&X were detected in samples from each well at concentrations as highPp ( <br /> 4 l <br /> ,l <br /> 1 hk 1 <br /> '1 u <br />