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CV�V'y A � A S S O C I A T E S I N C Groundwater samples were placed on ice and delivered under chain-of-custody documentation to Argon for chemical analysis Groundwater samples were analyzed by Argon for TPHg by EPA method 8015, BTEX by EPA method 8020, and MTBE, TAME, ETBE, DIPS, and TBA by EPA method 8260 The analytical results for groundwater samples are summarized in Table 2 1 Laboratory data sheets and chain-of-custody documentation are included in Appendix C 1 Groundwater samples collected from air sparge well ASI and piezometers AS 1(s), AS 1(d), PZ 1 a(s), PZ 1 a(d), and PZ 1 b(d) were also submitted to Western Analysis, Inc in Salt Lake City, Utah The samples were analyzed for rhodamine WT dye to establish baseline concentrations of ' rhodamine WT dye in the groundwater prior to beginning the air sparge pilot test 2.5.2 Fourth Quarter 2001 Monitoring Activities Fluid levels were taken on December 17, 2001, utilizing an electronic water probe capable of measuring with an accuracy of 11100 of a foot On December 17 and 18, 2001, groundwater ' samples were collected from monitoring wells MW1 through MW10 and DW Groundwater samples were placed on ice and delivered under chain-of-custody documentation to Argon for chemical analysis Groundwater samples were analyzed by Argon for TPHg by EPA method 8015, BTEX by EPA method 8020, and MTBE, TAME, ETBE, DIVE, TBA, 1,2-DCA, EDB by EPA method 8260 The analytical results for groundwater samples are summarized in Table 2 Laboratory data sheets and chain-of-custody documentation are included in Appendix C All on-site wells were surveyed on April 11, 2002 by a registered land surveyor at Condor Earth Technologies (#7698) The wells were surveyed to NAD83 horizontal datum and NAVD88 vertical datum The equipment used to survey the wells to the horizontal datum was a Leica GPS 500 sub-centimeter level GPS system in RTK mode The equipment used to survey the wells to the vertical datum was a Topcon Auto-Level optical level Survey data are presented in Table 4 3.0 SUBSURFACE CONDITIONS to �� �(k ,r ' 3.1 Geology 5 �S"1t Due to time constraints during drilling activities, soil from boring S134 was not logged from the ' surface to 45 feet bgs Soil from borings SBI through S133 generally consisted of silty sand and poorly graded sand from the surface to depths between 12 to 20 feet bgs, although soil in boring S133 contained inorganic silt Soil from borings SBI through SB3 consisted of poorly graded ' sand, organic silty clay, and sandy silt from 12 to 20 feet bgs and 32 to 40 feet bgs Soil from .� borings SB 1 through S133 consisted of silty sand and poorly graded sand from 32 to 40 feet bgs ' and 42 to 50 feet bgs, although soil in boring SB3 contained sandy silt Soil in borings SB2 through SB4 consisted of inorganic silt from 42 to 50 feet bgs and 52 to 60 feet bgs Soil from W 1163931reponsVifs doc 6