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' 29 December 1999 <br /> • AGE-NC Project No 97-0326 <br /> Page 2 of 3 <br />' (MAI), a State of California Department of Health Services (DHS)-certified analytical laboratory <br /> 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 (TBA) in accordance with <br /> EPA Method 8260B <br />' 3 0. FINDINGS <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> • Ground water was measured at a depth of approximately 32 feet below the tops of the well casings <br /> during the September 1999 monitoring event, within the screened Interval of MW2 and MW3, but <br /> approximately three feet above the screened interval in MWI 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 17 27 to 17 38 feet below mean sea level (MSL) Free product <br />' was not encountered at the site Ground water data is summarized on Table I <br /> Ground water elevation contours based upon the data for the September 1999 monitoring event are <br />' illustrated on Figure 3 The ground water flow direction was calculated to be S 8° W with a gradient <br /> of 0 0044 ft/ft <br />' <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br />' TPH-g was detected in samples collected from MWI, MW2 and MW3 at concentrations of 51,000 <br /> parts per billion (ppb, reported as micrograms per liter), 58,000 ppb and 170,000 ppb, respectively <br />' Benzene was detected in samples from MWI, MW2 and MW3 at concentrations of 1,800 ppb, <br /> 11,000 ppb and 22,000 ppb, respectively Toluene, ethylbenzene and xylenes were detected at <br /> concentrations as high as 26,000 ppb, 4,700 ppb and 24,000 ppb, respectively (MW3) <br />' MTBE was detected in MWI and MW3 at concentrations of 850 ppb and 320 ppb, respectively <br /> • D1PE, ETBE, TAME and TBA were not detected at the site Analytical results of water samples are <br />' summarized on Table 2 The laboratory report (MAI Sample Nos 22437-22439), chain-of-custody <br /> Advmrcrd CroEntiiron mental,Inc <br /> 1 <br />