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Ms. Christine E. Johnston 1992 AHR Response August 25, 1994 Page 5 MCC would like [o clarify to the Division the relationship between conductivity and TDS. Total dissolved solids are typically less than specific conductance, with a relationship of TDS = K (EC), with K ranging between 0.65 and L00 depending on the water. When this relationship can not be established, there may be a problem with the field acquisition of conductivity, which can be attributed to the status of the instrumentation, calibration, or temperature Fluctuations. MCC is not aware that this relationship has anything to do with good well completion. However, pHs higher than IO can suggest that [here is a well completion problem. FREQUENCY MCC acknowledges the omission of several parameters, although specific oversights have been inappropriately characterized. The June 4, 1992 GP-1 sample appears to be missing the lab conductivity, lab pH and TSS. In addition, examination of the field notes documents that some field parameters were acquired for SOM C-72-H on September 7, 1992, and not recorded. They include a field pH of 8.6, and field conductivity of 1.7, a temperature of 18.8°C, and a turbidity of 015 ppm. 2. MCC occasionally performs water monitoring in excess of the minimum required by the permit. This data is provided to the Division as supplemental information. In 1992, MCC was still in the process of collecting baseline data for SOM 128H. MCC tries to acquire at least one year of monthly field parameters. Under some circumstances, MCC has independently chosen to acquire additional monitoring above and beyond monitoring requirements. MISCELLANEOUS 1. MCC estimates that the 1992 hydraulic oil release into MB-4 amounted to approximately 250 gallons. This value is estimated from the amount of hydraulic fluid and oils that could be found in hydraulic lines within the loadout. There was no exact quantification of the amount of Fluid lost at the time, and the clean out removed water as well as Fluid. 2. MCC measures conductivity in the field as conductance with a Horiba Model U-7. AHRs prior to the 1993 AHR reported field conductivities as conductance. The 1993 AHR has the temperature correction applied. The reporting of non-temperature corrected data has contributed to the discrepancy between the field and laboratory results. In some cases, there appears to have been some field sampling error also, which may be associated with inadeyuate field equilibration of the equipment to the tempuature. MCC will attempt to minimize these problems in the future, through a sensitivity to the problem. 3. Table 16 was modified in an earlier revision to add SOM-129-H and to delete SOM-127-H (sae curcent Table 16.) SOM-38-H2 and SOM-38-H3 are deleted and the monitoring frequency for SOM-128H corrected in the attached revision. 4. MCC is unable to acquire climate data from NOAA's Somerset IE station until at least six months following collection of the data. The site is simply a rain gauge and dons no[ provide other meteorological data. It is not feasible to include this information in the AHR. MCC will utilize information from CSU's Colorado Climate Bulletin in future AHRs.