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S4 <br /> initial water level, the sample was collected Purge water was stored on-site in drums The well <br /> sampling information sheets containing data on temperature, conductivity, pH, depth to water, and well <br /> volumes purged are attached <br /> The groundwater sample was collected with a new disposable bailer The groundwater sample was then <br /> poured with minimum cavitation into the appropriate, laboratory prepared sample containers leaving no <br /> headspace The sample container was then immediately capped, labeled and placed in a chilled ice chest <br /> for shipment to Chromalab, Inc in Pleasanton, California (a State Certified Testing Lab) under chain-of- <br /> custody documentation= <br /> Groundwater Contour Map and Flow Gradient <br /> A groundwater contour map to a known datum was prepared for the data listed in Table 1 above (see <br /> Figure 1) The groundwater flow direction was to the north-northwesterly under a calculated gradient of <br /> 0 0032 The flow direction is consistent with historic observed trends, and remains relatively flat Overall <br /> groundwater levels appear to have dropped slightly from the previous quarter A relatively large <br /> groundwater "mound" is centered at well MW-2, groundwater mounds have formed in this vicinity in the <br /> past <br /> Chemical Analytical Methods and Results <br /> Nine groundwater samples were analyzed using EPA Methods 5030/8015, 602 and 8260 for Total <br /> Petroleum Hydrocarbons as Gasoline (TPHG), Benzene, Toluene, Ethylbenzene and Xylene (BTEX) and <br /> fuel oxygenates including Methyl-tert-butyl-ether (MTBE) The analytical results of the groundwater <br />. samples are attached and listed with historic data below (see Table 2), <br /> Table 2. Groundwater Chemical Data <br /> Well Date TPHG Benzene Toluene Ethylbenzene Xylene Fuel Ox <br /> NoSampled -------------------------ug/l ------------------------------ <br /> MW-1 3128196 ND ND ND ND ND NA <br /> MW-1 6127196 280 0 7 0 6 24 91 NA <br /> MW-1 12/19/96 ND ND ND ND ND ND <br /> MW-1 3110197 ND ND ND ND ND ND <br /> MW-1 6130197 ND ND ND ND ND ND <br /> MW-1 8120197 ND ND ND ND ND ND <br /> MW-1 12/12/97 ND ND ND ND ND ND <br /> MW-1 3131198 150 16 9 5 53 36 ND <br /> MW-1 6130198 ND ND ND ND ND ND <br /> MW-1 9129198 ND ND ND ND ND ND <br /> MW-1 1114199 ND ND ND ND ND ND <br /> MW-1 4129199 ND ND 11 ND 16 ND <br /> MW-1 1015199 ND ND 15 ND 21 ND <br /> Page 4 <br />