Laserfiche WebLink
i <br /> 01 October 2004 <br /> . AGE-NC Project No 00-0764 <br /> 1 Page 2 of 4 <br /> ' 2 2 GROUND WATER SAMPLE COLLECTION <br /> Water samples were collected from the monitoring wells using dedicated,disposable plastic bailers <br /> after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume <br /> Immediately upon retrieval, samples were transferred into chilled 40-m1 EPA-approved volatile <br /> organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample preservative <br /> ' and 1-liter amber bottles without sample preservative <br /> The samples were properly labeled, placed in a chilled container and transported under chain of <br /> ' custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health <br /> Services-certified analytical laboratory located in Paramount,California Each sample was analyzed <br /> in accordance with <br /> ' • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and diesel (TPH-d), <br /> I ' • EPA Method 8260B for volatile organic compounds (VOCs), including benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX), the fuel additives dl-isopropyl ether(DIPE), ethyl <br /> ' . tertiary butyl ether(ETBE), methyl tertiary butyl ether(MTBE), tertiary amyl methyl ether <br /> (TAME), tertiary butyl alcohol (TBA), methanol and ethanol, and the lead scavengers <br /> 1,2-dichloroethane (1,2-DCA), ethylene dibromlde (EDB), and <br /> • EPA Method 8260B for naphthalene, trichloroethane (TCE) and tetrachloroethene (PCE) <br /> ' 3.0. FINDINGS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected <br /> MW-1 through MW-4 on 07 September 2004, the contaminant impact to ground water was <br /> quantified from the ground water laboratory data <br /> t3 1 GROUND WATER ELEVATION AND GRADIENT <br /> Depths to ground water ranged between 32 05 and 33 49 feet below the top of the casings Ground <br /> ' water was within the screened Intervals of wells MW-1 through MW-4,which should yield samples <br /> fully representative of shallow ground water conditions,well MW-5 was screened at approximately <br /> 32 feet below the water table and should yield water samples representative of deeper ground water <br /> ' conditions <br /> Advanced GeoEnvfronmental,Inc <br />