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Water quality data is incomplete without simultaneous flow data. Platural salinity levels, in particular, are flow dependent and the Division needs to have this data. P & M needs to revise their FIMP to specify instantaneous flow monitoring at all surface water sites. While continuous recorders can simplify flow evaluations, the manual preparation of stage discharge curves with a flow meter also provides acceptahle data. 3) The operator needs to improve the collection of field electrical conductivity (EC) measurements. EC measurements typically equal or are greater than TDS concentrations, whereas P & M values average 77% of the TDS concentrations. A phone conversation with the P & 11 sampler, Mr. Dave Beverlin, indicated that the conductivity equipment was not being calibrated with standards. In addition to regular calibration, P & M should determine whether their Horiba reports electrical conductivity at 25°~ or whether the operator must perform the conversion himself. 4l In early January, I notified P & M that many of the August, 1987 full suite analyses appeared to have analytical duality control difficulties. After discussions with the operator and Ralph Poulson of ACZ, it hecame apparent that ny criteria for Duality assurance (a mass balance evaluation showing less than F g discrepancy between major cations and anions) was untenable in light of no potassium and chloride analyses. See Table 1. It appears that the operator will have to make some adjustments for the HMP for sites where the total dissolved solids levels are less than 550 mg/1. Additional Recommendations for HMP Modification It would seem timely to modify the Edna HF'P at this time, since P & M has prepared a detailed cumulative AHR. Several toxics occur at levels far below standards and could he removed from the monitoring plan. The lists being run for some parameters are incompatible with existing standards or current environmental perspective on the appropriate form for analysis. Given the establishment of a spoils aquifer at Edna it is prudent to establish a spoils monitoring program. Lastly, it is unclear to me why there is no hedrock aquifer monitoring program at P & M. 1) Arsenic, selenium, zinc, mercury and dissolved oxygen may be dropped from the long parameters lists. Arsenic levels are ten times lower than the aquatic life and domestic standards of 0.05 mg/1. Selenium levels are four-to-ten times lower than the domestic standard of 0.01 mg/1. Zinc levels are five times lower than the aquatic life standards (which vary from 0.05 mg/1 - 0.60 mg/1 depending on hardnessl, Mercury levels are observed at the analytical detection limit, and until that improves to the level of the standard (0.00005 mg/1) there is no current utility in monitoring this parameter. Dissolved oxygen levels have heen acceptable historically, and thus pose no problem unless conditions should change dramatically.