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21 December 2001 <br /> AGE-NC Project No. 95-0106 <br /> Page,2 of 5 <br /> Temperature, pH and- conductivity were measured at 0.5-gallon -to 1.5-gallon intervals, as <br /> appropriate, using an Oakton water analyzer to monitor stabilization of these ground water <br /> ;. parameters..Field data logs are included in Appendix A.'-Purged water was temporarily stored on-site <br />' in 55-gallon DOT-approved H-17 storage drums pending proper disposal. <br /> 3.2. COLLECTION AND ANALYSIS OF GROUND WATER`SAMPLES <br /> Water samples were collected from each monitoring well using new disposable bailers. The samples, <br /> -were- transferred into. 40-m1 EPA-approved•vials containing 0.5 nal 1.8% hydrochloric acid as a <br /> .. preservative. The sample vials were then labeled with the monitoring.well designation, date, time - <br /> of sampling and the.sampler's initials. The samples were transported in a chilled container under <br />' char of custody to McCampbell Analytical, Inc. (MAI), a California Department of Health Services <br /> (DHS)-certified analytical laboratory for.'analysis. The samples were analyzed for: <br />'. •, Total petroleum hydrocarbons quantified as. gasoline (TPH-g) in accordance with <br /> EPA Method 8015 Modified, and <br /> • Volatile aromatic compounds, specifically benzene, toluene, ethylbenzene, and totalxylenes <br /> (BTEX) with methyt tertiary.butyl ether (MTBE) in accordance with EPA Method 8020. <br /> 4.0. FINDINGS <br /> Ground water elevation and,flow direction were inferred from field data- hydrocarbon-impact to <br /> 'ground waterwas was quantified by-lahoratory analysis;of the groundwater sample's: <br /> ` <br /> 4.1. - GROUND WATER.ELEVATION AND FLOW DIRECTION <br /> The,,relative:ground water elevation increased,.an ave_rage:of 0.76 feet since. the August 2001; <br /> monitoring event and the average' flow'direction was northward; varying from"northeastward to <br /> I northwestward. The average ground water,flow direction in.the area enclosed by monitoring wells <br /> MW3, MW4;'and MW6 was toward the northeast at a gradient of approximately 0.01 ft/ft, and the <br /> flow direction.was;toward the north-northwest in the area bounded by MWi 3, MW5, and.MW4`at <br /> ' a gradient of approximately 0.004 ft/ft. Ground water:clevation data-is presented in Table 1; the <br /> -contoured.ground water.elevation data is shown on Figur6 3'. <br /> ;, „ 6 Advanced GeoEnvironmental,Inc. <br />