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I r L <br /> 29 May 2000 <br /> AGE-NC Project No 99-0624 <br /> Page 2 of 4 <br />' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> A total of four water samples were collected from monitoring wells MW-1, MW-2, MW-3, and <br />' MW-4 using new disposable bailers, after allowing the wells to achieve a minimum 80%recovery <br /> of the pre-purge water volume The samples were transferred into 40-m1 EPA-approved VOA vials <br /> containing 0 5 ml 18% hydrochloric acid as a sample preservative The sample vials were then <br />' labeled with the monitoring well designation,date, time of sampling and the sampler's initials The <br /> samples were transported in a chilled container under chain of custody to McCampbell Analytical, <br /> Inc (MAI), a California Department of Health Services (DHS)-certified analytical laboratory for <br /> analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Method 5030/8015 Modified, <br /> • Volatile aromatic compounds, including benzene, toluene, ethylbenzene, and total xylenes <br />' (BTEX)with methyl tertiary butyl ether(MTBE)in accordance with EPA Method 8020, and <br /> • Fuel oxygenates,including tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tert-butyl <br /> ether(ETBE), tert-amyl methyl ether(TAME),and MTBE in accordance with EPA Method <br /> 8260M <br /> 23 SURVEYING <br />' On 04 January 2000,the casing elevations ofwells MW-1,MW-2,MW-3 and MW-4 were surveyed <br /> to the nearest 0 01-foot relative to City of Lodi Bench Mark #BM563 by representatives of <br /> Baumbach and Piazza, Inc of Lodi, California, licensed surveyors (Appendix B) <br /> r <br />' 30 FINDINGS <br /> Ground water elevations were determined by subtracting the measured depths-to-water from the <br />' surveyed casing elevations and are presented in Table 1 Ground water flow direction was <br /> determined by contouring the ground water elevations on a scaled site plan(Figure 3) Hydrocarbon- <br /> impact and MTBE-impact to ground water was inferred from laboratory analysis <br /> 1 _ <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> Monitoring data from MW-1, MW-2, MW-3, and MW-4 was combined to infer the site-specific <br /> ground water flow direction Ground water flow direction was inferred to be southerly at <br />' Advanced GeoEnvironmental,Inc <br /> I r <br />