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4 0 FINDINGS <br /> 4.1 Groundwater Elevation and Gradient Direction <br />' The relative elevation of groundwater in each well was calculated by subtracting the <br /> groundwater depth from the surveyed casing elevations, casing elevations N%ere surveyed <br /> relative to MW-1, which was assigned an arbitrary elevation of 100 00 feet (Table 1) On <br />' October 13, 1994, groundwater depth at the site ranged from 8 to 9 feet below ground <br /> surface (bgs) A 002 foot increase in groundwater depth (decrease of groundwater <br /> elevation) was detected between the October and No%ember samplings <br />' Figure 3 illustrates the relative ground-%N ate r elevations at the site, based upon data collected <br /> dunng the October 1994 sampling Groun&,ater flow in the area is north-northwest, "'Ith <br />' a small flexure to the west evident bet,.-%een MW-7 and MW-6 The overall north-northwest <br /> trend is consistent with regional groundwater flow in the area <br /> 4.2 Laboratory Analysis of Groundwater Samples <br /> Duuing the October 1994 sampling no total petroleum hydrocarbons (TPH as gasoline) -,N ere <br /> detected in any of the sampled � ells Benzene, ethylbenzene and xylenes were detected only <br /> in the sample from MW-1 at concentrations of 2 1 ppb, 15 ppb and 1 4 ppb, respectively <br /> Low concentrations of toluene were detected in samples from MW-1 (0 52 ppb), MW-6 <br /> (0 87 ppb), MW-7 (1 1 ppb), 1.1W-9 (0 63 ppb) and MW-10 (0 89 Ppb) <br /> During the No%ember sampling, TPH as gasoline, benzene and xylenes v eie detected in <br /> MW-2 at concentrations of 150 ppb, 1 9 ppb and 3 7 ppb, respectively Low concentrations <br /> of toluene were detected in MW-2, I1IW-3, i1IW-4 and MW-S at concentrations of 0 95 ppb, <br /> 0 93 ppb, 0 78 ppb and 0 54 ppb, i espectr.ely <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 5.1 Hydrocarbon Impacted Ground.+ater <br /> Prior to the October and November 1994 samplings, the last time that wells at the site were <br /> sampled was on January 29, 1992 DUI ing the Januaiy 1992 sampling, TPH as gasoline was <br /> detected only in samples from MW-2 and MW-6 at concentrations of 2,400 ppb and 14,000 <br /> ppb, respectively (well MW-1 was not sampled) Benzene, ethylbenzene and xylenes were <br /> detected only in the sample fiom MW-6 at concentrations of 1,200 ppb, 480 ppb and 740 <br /> ppb, respectively Toluene was detected in samples from MW-6 (160 ppb) and MW-7 (0 51 <br /> Ppb) <br /> Geologwl Anda Sc ma Inc 6 <br /> SC-94 07 1001 WAAMMERS"UX QR1/r2 94 <br />