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STIG PROJECT -- EVALUATION OF WATER FOR INJECTION -- 28 March 1994 13 significant and because they could form as crusts, if uncontrolled, the associated level of concern (Table 2) is given as "moderate". So long as dispersants have their intended effects and the liquid is filtered prior to injection, phosphate mineral formation in the plant would present no threat to operation of the injection well. Residual polyphosphates and phosphonates may be expected to continue their slow decomposition to orthophosphate after injection to the geologic medium. In principle, this would result in deposition of apatite minerals along the fluid flow pathways. In a practical sense, the low rate of decomposition, compared to the fluid flow rate and associated distance from the injection well, may be expected to yield a negligible impact on the rock permeability near the wellbore. D. Sulfate Minerals Elements barium and strontium are indicated to be present at low concentrations in the WSWPCF water,but,like heavy metals,the actual concentrations are poorly resolved.In particular, barium sulfate is highly insoluble and would be expected to form barite at the measured concentrations of barium and sulfate. One could expect particulate barite to be removed early in the filtration sequence. Celestite, strontium sulfate, is more soluble than barite, and is marginally susceptible to precipitate.Strontium concentrations of about 1 ppm were observed in some of the early chemical analyses(not shown in Table 1)but analyses were reported irregularly.If celestite formed,it would behave similarly to barite. For both minerals, only small amounts would form, if any. Their presence could add, in a minor way, to the bulk of sludge, etc., but would not present any new issues substantially different from the sludges which contain phosphate minerals and dusts scavenged from air at the cooling tower. IV. DOMENGINE FORMATION Rocks A generalized stratigraphic column (NCPA 7/10/91) describes the Domengine as two sandstone members separated by a sandy shale member. sandy shale member: sandy to clayey shale with interbedded very fine to medium grained quartzose sandstone. Marine origin. sandstone member: massive, fine to coarse grained, predominantly quartz with orthoclase, plagioclase, glauconite, and lithic fragments. Kaolinite and lignite in lower member. Crossbedded and commonly fining upward. Marine origin. The high proportion of quartz and tectosilicate minerals suggests a negligible reactivity with injectate waters at relevant temperatures. Formation of alumino-silicate minerals utilizing silica from the injectate and aluminum from kaolin, etc., may be expected negligible due to the near neutral pH and low temperatures. Formation Water A partial chemical analysis for a sample of formation water taken from the injection well DON MICHELS ASSOCIATES -Missoula,Montana USA