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detected in several of the samples including a low concentration to the <br /> on-site drinking water well The groundwater flow direction in the first <br /> zone (shallower than 19-feet bgs) was to the north and northeast at a <br /> gradient of approximately 0 002-feet/foot <br /> 2-2 Bi-Weekly Free-Floating Hydrocarbon Measurement and Removal <br /> Since the discovery of the free-floating hydrocarbons in monitoring well <br /> MW-5, ASE has measured the thickness of the free-floating hydrocarbons <br /> in monitoring wells MW-5 and MW-6 and then removed all accumulated <br /> free-floating hydrocarbons in the well with a bailer every two weeks prior <br /> to January 2000 and monthly after January 2000 <br /> 2. 10 December 1229 Area Well SuEy-!ay <br /> In December 1999, ASE conducted a more detailed area well survey for <br /> the site than the one previously conducted This survey identified 57 <br /> wells within a 2,000-foot radius of the site Of these 57 wells, 39 are <br /> domestic, 3 are irrigation only, and 15 are of unknown usage The closest <br /> properties to the site with wells are directly to the east, directly to the <br /> southeast and across Airport Way to the west (at least 120-feet from the <br /> site) These wells are located in upgradient or crossgradient directions <br /> from the site (based on groundwater flow in the shallow zone) The <br /> closest wells potentially downgradient of the site are approximately 120- <br /> feet northwest the site One of these wells is a domestic well The closest <br /> well directly downgradient of the site's USTs is an irrigation well located <br /> approximately 240-feet north of the site The closest domestic well <br /> directly downgradient of the site's USTs is located approximately 300-feet <br /> north of the site <br /> 2-11 March 2000 Monitoring Well Installation <br /> In March 2000, ASE installed groundwater monitoring wells MW-11 <br /> through MW-15 and piezometers P-1 through P-5 Monitoring wells <br /> MW-13 through MW-15 and piezometers P-1 through P-5 are screened <br /> between 9-feet bgs and 19-feet bgs Monitoring wells MW-11 and MW-12 <br /> are screened between 55-feet bgs and 70-feet bgs <br /> Free-floating hydrocarbons were present in monitoring well MW-5, no <br /> free-floating hydrocarbons were present in any of the surrounding <br /> monitoring wells or piezometers High hydrocarbon concentrations were <br /> detected in groundwater samples collected from monitoring well MW-6, <br /> with toluene, ethyl benzene and total xylene concentrations in this well <br /> Frank's One Stop Workplan — December 2000 <br /> -5- <br />