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Ci' <br /> v o . } <br /> z <br /> A S S O C I A T E S 1 N C <br />' Soil boring AS I was completed with one 4-inch diameter air sparge well to be used in the air <br /> sparge pilot test The screened interval of the air sparge well was positioned so that 15 feet of <br /> 0 020-inch screen was present from 55 feet to 70 feet bgs In addition, the air sparge well <br /> contained 10 feet of 0 010-inch screen from 75 to 85 feet bgs The construction details of the air <br /> sparge well are depicted on the figure contained in Appendix A <br /> Soil borings ASI, P ZIa, and PZlb were each completed with a piezometer pair to be used in <br /> monitoring water elevation, dissolved oxygen, and the distribution rhodamme WT dye added to <br /> the groundwater during the air sparge pilot test The screened interval of the shallow piezometer <br /> in wells PZ1 a and ASI were positioned so that one foot of 0 010-inch screen was present from <br /> 64 to 65 feet bgs and the screened interval of the shallow piezometer in well PZ 1 b was <br /> positioned so that one foot of 0 010-inch screen was present from 61 to 62 feet bgs The <br /> screened interval of the deep piezometer in wells PZ 1 a, PZ 1 b, and AS 1 were positioned so that <br /> one foot of 0 010-inch screen was present from 78 to 79 feet bgs The construction details of the <br /> piezometers are depicted on the figures contained in Appendix A <br /> Soil borings VW1, VW2, and VW3 were completed as 2-inch diameter vapor extraction wells to <br /> be used in the vapor extraction pilot test The screened interval of each vapor extraction well is <br /> from approximately 51 to 65 feet bgs The construction details of the vapor extraction wells are <br /> depicted on the figures contained in Appendix A <br /> Soil borings MW9 and MW10 were completed as 2-inch diameter groundwater monitoring <br /> wells The screen interval of the monitoring wells was positioned from approximately 60 feet to <br /> 80 feet bgs The construction details of the groundwater monitoring wells are depicted on the <br />' logs contained in Appendix A <br /> 2.4 Monitoring Well Development <br />' Air sparge well ASI, piezometers AS 1(s), AS 1(d), PZ 1 a(s), PZ 1 a(d), and PZ 1 b(d), and the <br /> groundwater monitoring wells MW9 and MW 10, were developed on September 25 and 26, 2001 <br /> Piezometer PZ 1 b(s) was not developed because it was dry Each well was purged until the <br /> extracted water was relatively sediment free Development logs are included in Appendix D <br /> Purgewater was temporarily stored on site in 55-gallon drums <br />' 2.5 Groundwater Sampling and Analysis <br /> 2.5.1 Third Quarter 2001 Monitoring Activities <br /> Fluid levels were taken on September 25, 2001, utilizing an electronic water probe capable of <br /> measuring with an accuracy of 11100 of a foot On September 25 through 26, 2001, groundwater <br /> samples were collected from monitoring wells MW1 through MW10, air sparge well ASI, and <br /> piezometers AS 1(s), AS 1(d), PZ 1 a(s), PZ 1 a(d), and PZ 1 b(d), and the on-site drinking water well <br /> (DW) <br /> w 1163931reportslnfs doe 5 <br /> 1 <br />