Laserfiche WebLink
3.2 Storage Drum Sampling <br /> On January 25,water samples were also collected from each of the nine water storage drums <br />' located on-site. One 40-m1 EPA vial was collected from each drum using a disposable plastic <br /> bailer. These nine samples were composited and analyzed for TPH as gasoline and BTE&X <br /> Iin accordance with EPA methods 8015m and 602, respectively. <br /> 4.0 FINDINGS <br /> 4.1 Groundwater EIevation and Gradient <br /> The elevation of the water table was approximately 25 feet below sea level in January The <br /> calculated gradient on January 25, 1994, was 0 00099 ft/ft, directed S 80° E (Figure 3). This <br /> is steeper than the previously calculated gradient of 0 00057 ft/ft measured in October 1993, <br /> but still shallower than the gradient of 0 004 ft/ft measured in November 1992 Groundwater <br /> flow direction has been consistently east to northeast <br />' 4.2 Laboratory Evidence of Contamination <br /> TPH as gasoline was detected in the water sample from MW-4 at 1,400 ppb, a decrease of <br /> over 5,000 ppb since October 1993. Benzene, toluene, ethylbenzene and xylene were <br /> detected at much lower levels (Table 3) No contamination was detected in the composite <br /> Iwater sample collected from the plastic storage drums The laboratory report and chain-of- <br /> custody for the water samples are included in Appendix A <br /> t <br /> TABLE 3 <br />' ANALYTICAL RESULTS OF WATER SAMPLES <br /> µlm <br />' Sample TPH as Ethyl- <br /> ID Gasoline Benzene Toluene benzene Xylene <br />' MW-4/10-19-93 6,800 1,400 560 240 450 <br /> MW-4/1-25-94 1,400 460 25 75 22 <br />' Drum 1-9 ND ND ND ND ND <br /> Ag/L = parts per billion (ppb) <br />' ND = None Detected <br />' 6 <br /> I <br />