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' 4.2 Groundwater Depth and Flow Direction <br /> Groundwater at the site has risen appro)dmately 3jeet since November of 1993. However, <br /> the flow direction has remained consistently norteast. Figures 3 and 4 show the elevation <br /> of piezometric surface on March 30 and April 13, 1994. <br />' 4.3 Groundwater Sample Analysis <br />' The analytical results of groundwater samples collected on January 31 and April 13, 1994 <br /> are shown in Table 3, along with results from the September 1993 monitoring. Petroleum <br /> hydrocarbons in the diesel range were detected in the sample from MW-1 (90 ppb) on <br />' January 31, 1994. However, no petroleum hydrocarbons were detected in MW-1 during the <br /> April 13, 1994 sampling. No hydrocarbons had been previously detected in MW-1, and <br /> therefore, the detection of diesel in sample MW-111-31-94 is viewed as questionable by <br />' GeoAudit. <br /> TABLE 3 <br /> ANALYTICAL RESULTS of WATER SAMPLES <br />' Yellow Submarine <br /> ( Lg/L) <br /> Sample 1D Date TPH as. TPH as Benzene Toluene Ethyl- Xylene <br /> + Gasoline Diesel benzene <br />' MW-1 9-13-93 ND ND ND ND ND ND <br /> 1-31-94 ND 0 ND ND ND ND <br /> 4-13-94 ND ND ND ND ND ND <br />' MW-2 9-13-93 ND ND ND ND ND ND <br /> 1-31-94 ND ND ND ND ND ND <br /> 4-13-94 ND ND ND ND ND ND <br />' MW-4 9-13-93 40 Q> ND 1.5 ND ND <br /> 1-31-94 ND ND ND ND ND ND <br /> 4-13-94 ND Q ND ND ND ND <br />' MW-5 9-13-93 ND 50 ND ND ND ND <br /> 1-31-94 ND ND ND ND ND ND <br /> 4-13-94 ND ND ND ND ND ND <br />' MW-6 4-13-94 ND ND ND ND ND ND <br /> MW-7 4-13-94 ND ND ND ND ND ND <br />' MW-8 4-13-94 ND ND ND ND ND ND <br /> uSR- P—per billion(Ppb) <br /> C—Ibj ]Anda S—Al .lee <br /> 673-WR-4-94/Ye0m.Sub rine <br /> i <br /> NZI <br /> 1 <br />