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1 <br /> No petroleum hydrocarbons were detected in any of the samples <br /> 3.4.2 Groundwater Sampling, October 1993 <br /> On October 14, 1993, personnel from GeoAudit attempted to purge standing water from the <br /> monitoring wells using a submersible pump However, because of heavy equipment <br />' operation at the site during excavation and soil disposal, the wells contained too much silt <br /> and could not be purged Personnel returned to the site on October 18, 1993 to redevelop <br /> the wells and perform the monitoring <br />' In October 1993, the <br /> hydraulic gradient was calculated to be 0 0050 ft/ft directed S 720 E <br /> Y <br /> This gradient was steeper than the previous gradient of 0 0025 ft/ft, but the direction was <br />' nearly identical to the June 1993 direction of S 700 E No petroleum hydrocarbons were <br /> detected in any of the samples <br />' 3.4.3 Groundwater Sampling, January 1994 <br />' On January 14, 1994 each well was monitored and sampled for the fourth time Between <br /> October 1993 and January 1994, groundwater rose approximately 2 5 feet in all wells The <br /> gradient was calculated to be 0 00032 ft/ft, oriented due east <br />' Initially, benzene, toluene and xylenes were detected in MW-3 These results were <br /> determined to be questionable by GeoAudit and the sample (MW-3/1-14-94)was reanalyzed <br /> Upon reanalysis, no petroleum hydrocarbons were detected in the sample However, the <br /> sample was reanalyzed after the holding time had expired <br />' 3.4.4 Groundwater Sampling, April 1994 <br /> On April 15, 1994,personnel from GeoAudit performed the quarterly monitoring at the site <br /> Groundwater was highest in MW-2 and the flow direction was to the northwest The <br /> calculated gradient is 0 00042 ft/ft oriented N 57° W The flow direction has shown <br /> considerable past variations, shifting from south-southwest to northwest No petroleum <br /> hydrocarbons were detected in any of the wells <br /> 3.4.5 Groundwater Sampling, September 1994 <br />' At the request of the PHS/EHD, groundwater depth measurements were collected from the <br /> site on a weekly basis between August 17 and September 7, 1994 Groundwater samples <br /> rwere collected from each well on September 7, 1994, <br /> Figures 4, 5, 6 and 7 illustrate the relative elevation of the piezometnc surface at the site <br /> on August 17, 24, 31 and September 7, 1994, respectively Between August 17 and <br /> Gcobpa[w.d,l srv,n..lsa <br /> 1"GI Re vd CERn 4SLSO.% 6 <br />