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1 <br /> -t'Y� <br /> CLEARWATER <br /> G R O U P, I N C <br /> 1 <br /> ' measurements were made relative to the top of casing on MW-1 <br /> Quarterly groundwater monitoring and sampling (Hurd quarter 1995) was conducted <br /> t on MW-1 through MW-6 on September 27, 1995 after MW-6 had been developed. <br /> Depth to groundwater was measured in each well to the nearest 0 01 foot using an <br /> electric water sounder. <br /> The wells were purged of at least three well volumes while monitoring <br /> temperature, conductivity, and pH to ensure collection of a representative <br /> groundwater sample. After groundwater in the wells recovered to 80% of the pre- <br /> purged volume, a polyethylene bailer (one dedicated to each well) was used to <br /> collect groundwater samples Field data sheets which include gauging, purging, and <br /> ' development data are included in Appendix C <br /> Water samples were transferred to laboratory-supplied sample bottles and labeled <br /> ' with appropriate well designations Samples were documented on a chain of <br /> custody form and placed in a cooler for shipment to AEN All groundwater samples <br /> were analyzrd for TPHg and BTEX, and the sample from MW-2 was also analyzed <br /> for MTBE. <br /> i2.5 Pilot Test: of SVE and Air Sparge Wells <br /> On November 7 and 8, 1995, Clearwater conducted a pilot test in accordance with the <br /> ' Workplan dated April 29, 1995. Two vapor extraction wells (VW-1 and VW-2) and <br /> two air sparge wells (SW-1 and SW-2) were tested while vacuums, pressure, and <br /> ' other parameters were monitored in MW-4, MW-5, and MW-b, <br /> 1 ' <br /> Monitoring wells MW-1, MW-2, and MW-3 were not monitored_during the tests <br /> because the screens were occluded by groundwater (water levels have (risen <br /> approximately six feet since the three monitoring wells were installed in 1993) <br /> Groundwater was within four feet of the top of the screened intervals in MW-4, <br /> ' MW-5, and MW-6 at the time the tests were conducted I <br /> I <br /> Soil VapQr Extraction Pilot„Test <br /> I Prior,to,conducting the SVE pilot test, the following parameters,were"measured I 1! II <br /> II 1 I I I I ,I I I <br /> I •I I <br /> Water'levelsll all wells <br /> ! ! <br /> n I II I If <br /> I <br /> k I <br /> 1I'I I I MY ' <br /> D101 b 11 PAR/3Q/PILOT b1116 <br /> ff I <br />