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• 1 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, 3/4" ID casing 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 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 groundwater 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-SpargeTM Remediation Operation Summary C-SpargeTM remediation system operating statistics for the period of April 1, 2004 through June 30, 2005 are summarized on Table 5 Attachment 1 contains the field detail in support of Table 5 The infection rates were assumed to be mid-range approximately, 2 5 SCFM Respectively, during April, May, and June 2005 the C-SpargeTM system operated 337 15, 528 88, and 470 10 actual hours Respectively, 2 97, 4 66, and 4 15 pounds of 03 were injected during April, May, and June 2005 For the entire second quarter 2005 the system was operated 1336 13 hours (i e , actual hours) and 1178 pounds of 03 were injected The system was non- operational, which includes scheduled non-operation, scheduled maintenance and down time, for 847 87 hours during this quarter Actual operation from system start-up on June17, 2004 to June 22, 2005 was 4487 49 hours From start-up through June 22, 2005, 35 25 pounds of 03 were injected The system was non- operational, which includes scheduled non-operation, scheduled maintenance and down time for . 4596 51 hours S 1268231QM reports12005 2ndQR doe 7