Laserfiche WebLink
17 September 1999 <br /> • AGE-NC Project No 97-0326 <br /> Page 2 of 4 <br /> placed in a chilled container and transported under chain-of-custody to AIpha Analytical <br /> Laboratories, Inc (AAL), a State of California Department of Health Services (DHS)-certified <br /> analytical laboratory Each sample was analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> method GCFID 5030, <br /> • Volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and total xylenes, BTEX) <br /> with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020, and <br /> • Oxygenated compounds, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE, tertiary-amyl methyl ether (TAME) and tertiary butanol ( fBA) in accordance with <br /> IEPA Method 8260B <br /> 2 3 WELL CASING ELEVATION SURVEY <br /> lie Due to the unanticipated ground water flow direction calculated for the site, the casing elevations <br /> of the three wells were resurveyed relative to a City of Stockton bench mark Resurvyeing confirmed <br /> the previous casing elevation data Surveying was performed by Baumbach &.. Piazza, Inc <br /> 3.0. FINDINGS <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Ground water was measured at a depth of approximately 30 feet below the tops of the well casings <br /> during the June 1999 monitoring event, within the screened interval of MW2 and MW3, but <br />' approximately five feet above the screened interval in MW1 The elevation of ground water in each <br /> well was calculated by subtracting the depth to ground water from the surveyed casing elevations <br /> Ground water elevations ranged from 15 62 to 15 70 feet below mean sea level (MSL) Ground water <br />' data is summarized on Table 1 <br /> Ground water elevation contours based upon the data for the June 1999 monitoring event are <br />' illustrated on Figure 3 The ground water flow direction was calculated to be S I' E with a gradient <br /> of 0 0037 ft/ft <br /> I <br /> I <br /> Adianced GeoEmironmeniak,Inc <br /> I <br />