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4 n 1 •.Y ' Mr. Gregory Basso -4- For each of the indicator parameters specified in paragraph (b) (3) of this section, at least four replicate measurements must be obtained for each sample and the initial background arithmetic mean and variance must be determined by pooling the replicate measurements for the respective parameter concentrations or values in samples obtained from upgrading wells during first year. The facility does not collect four replicate measurements for each of the indicator parameters for each of the wells sampled. Violation #6 Section 265.91 (c) Code of Federal Regulations Title 40. All monitoring wells must be cased in a manner that maintains the integrity of the monitoring well bore hole. This casing must be screened or perforated, and packed with gravel or sand where necessary, to enable sample collection at depths where appropriate aquifer flow zones exist. The annular space (i.e. , the space between the bore hole and well casing) above the sampling depth must be sealed with a suitable material (e.g. , cement grout or bentonite slurry) to prevent .contamination of samples and the groundwater. Geophysical logs were not available for review. A determination as to whether or not the annular space was properly sealed can not be made without this information. Violation #7 Section 265.90 (a) Code of Federal Regulation Title 40. Within one year after the effective .date of these regulations, the owner or operator of a surface impoundment, landfill, or land treatment facility which is used to manage hazardous waste must implement a ground-water monitoring program capable of determining the facility' s impact on the quality of ground water in the uppermost aquifer underlying the facility, except as 265.1 and paragraph (c) of this section provide otherwise.