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1 April 1993 <br /> (GeoAudit 661-5) <br /> Page 2 of 3 <br />' Table 1 <br /> Groundwater Elevations <br /> Depth to Groundwater <br />' casing Groundwater Elevation <br /> Well No. Elevation <br /> 2-24-93 3-5-93 2-24-93 3-5-93 <br /> 1 49.71 9 . 94 9. 85 39 . 77 39 .86 <br /> 2 48.40 8. 55 8.48 39. 85 39 .92 <br /> 3 48.74 8 .74 8. 66 40. 00 40. 08 <br /> The samples were collected in 40 ml EPA vials and 1-liter amber <br /> bottles, and stored on ice pending transportation to a state <br /> certified laboratory. The samples were analyzed for total petroleum <br /> hydrocarbons (TPH) as gasoline and diesel and purgeable aromatic <br /> hydrocarbon compounds (BTE&X) in accordance with EPA methods 8015m <br /> and 602 (see Appendix A) . <br /> FINDINGS <br />' The groundwater gradient was determined to be 0. 0050 ft/ft oriented <br /> N 160 W on 24 February 1993 and 0. 0022 ft/ft oriented N 80 W on 5 <br /> March 1993 . This is consistent with previous groundwater <br /> Ideterminations and regional trends. <br /> TPH as gasoline was detected in MW #1 at 4 , 000 gg/L (ppb) . TPH as <br /> diesel was detected at 1, 800 ppb. BTE&X were detected at levels of <br /> 6. 1 ppb, 4 . 1 ppb, 29 ppb and 450 ppb, respectively. No hydrocarbon <br /> contamination was detected in MW #2 and only toluene (0. 32 ppb) was <br /> detected in MW #3 (see Table 3) . <br /> CONCLUSIONS <br /> No contamination was encountered in MW #2 , and only a small amount <br /> of toluene was found in MW #3 . MW #1 contained significant <br /> quantities of hydrocarbons. Groundwater flow is in a north to <br /> northwesterly direction, making MW #1 the down gradient monitoring <br /> well. <br /> Geological Audit recommends that an additional monitoring well be <br /> installed north of MW #1 (down gradient) to determine the down <br /> gradient extent of the groundwater contamination. <br />