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1 v ATC A S S O C I A T E S I N C From approximately one foot below the bottom of lower diffuser to approximately two feet above the top of the lower diffuser, each hole was filled with #3 sand. Above the lower diffuser, ' a blank, 3/4" ID casing was coupled to the diffuser and then installed to surface. Between the top of the sand (i.e., above the lower ozone diffuser) and one foot below the bottom of the upper ozone diffuser, each hole was bentonite-sealed in the annular space to prevent short-circuiting. ' Above the upper ozone diffuser, a blank 314" ID casing g was also coupled to the diffuser and then ' installed to surface. Number 3 sand was placed around the upper diffuser to two feet above its top, a three-foot bentonite plug was placed from above the # 3 sand, and then the annular space in the hole was sealed to the surface with a cement grout. A 12" diameter well box was placed at surface. The predominant soil type adjacent to the lower diffuser was fine or fine to medium sands. The ' predominant soil type adjacent to the upper diffuser was silt or silty clays. 4.2.3 Groundwater Monitoring Well Network for the Remediation System Seven on site ground water monitoring wells (MW1, MW2, MW3, MW4, MWS, MW8 and EW- 1) make up the remediation system monitoring well network at the Jamar site. Nine off site wells - MW6a, MW6b, MW6c, MW7a, MW7b, MW7c, MW9a, MW9b and MW9c are used for additional groundwater monitoring information but are not part of the active remediation system. These wells may be considered as part of the area cleaned-up by the active system at a later date where there is supporting evidence. Table 4 also includes a summary of the groundwater monitoring well completion data for the Jamar site. 4.3 C-Sparge M Remediation Operation Summary C-SpargeTM remediation system operating statistics for the period of June 17, 2004 through March 31, 2005 are summarized on Table 5. Attachment 1 contains the January 1, 2005 through March 31, 2005 data and field detail in support of Table 5. The injection rates were assumed to be mid-range approximately, 2.5 SCFM. Respectively, during January, February and March 2005 the C-SpargeTM system operated 403.75, ' 486.17 and 331.20 actual hours. Respectively, 3.56, 4.29 and 2.92 pounds of 03 were injected during January, February and March 2005. For the entire First Quarter 2005 the system was operated 1221.12 hours (i.e., actual hours) and 10.77 pounds of 03 were injected. The system was non-operational, which includes scheduled non-operation, scheduled maintenance and down ..time, for 938.88 hours.during this quarter. ' Actual operation from system start-up on 17 June to March 31, 2005 was 3151.36 hours. From start-up to through March 31, 2005, 23.49 pounds of 03 were injected. The system was non- operational, which includes scheduled non-operation, scheduled maintenance and down time for 3748.64 hours. 5:1268231QM repom\2005 1stQA,doc 7