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( O%TC 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 Number 3 sand. Above the lower diffuser, a blank, 0.75" 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, 0.75" 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 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 onsite groundwater monitoring wells (MW1, MW2, MW3, MW4, MW5, MW8 and EW- 1) make up the remediation system monitoring well network at the Jamar site. Nine offsite wells - MW6a, MW6b, MW6c, MW7a, MW7b, MW7c, MW9a, MW9b and MW9c are used for additional groundwater monitoring information but not necessarily influenced by or considered part of the area cleanup by the active remediation system. These wells may be considered as part of the area cleaned-up by 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 June 17, 2004 through December 31, 2004 are summarized in Table 5. Attachment I contains the October 1, 2004 through December 31, 2004 data and field detail in support of Table 5. The injection rates were assumed to be mid range, approximately 2.5 SCFM. Respectively, during October, November and December 2004, the C-SpargeTM system operated 248.09, 42.40 and 318.09 actual hours. Respectively, 0.437, 0.075 and 0.561 pounds of 03 were injected during October,November and December 2004. For the entire Fourth Quarter 2004, the system was operated 608.58 hours (i.e., actual hours) and 1.073 pounds of 03 were injected. The _system. was non-operational, which includes. scheduled non-operation, scheduled maintenance =. and down time, for 1599.42 hours during this quarter. Actual operation (i.e., cumulative operation) from system start-up on June 17, 2004 through . December 31, 2004 was 1,930.24 hours. From start-up through December 31, 2004, 12.728 pounds of 03 were injected. Actual operation was 1930.24 hours. The system was non- S:1268231QM reports12004 4QA.doc 7