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NORTHERN CALIFORNIA POWER AGENCY <br /> STIG PROJECT <br /> EVALUATION FOR INJECTION <br /> TABLE 2: MINERAL DEPOSITION POTENTIAL <br /> Mineral Name Composition DEPOSITION Levelof Concern <br /> (mg/kg*) <br /> 5_ 6 <br /> Amorphous Silica Si02.2H2O -6 11 Important <br /> Chalcedony Si02 94 110 negligible** <br /> FCO,Apatite Ca9 SNa0.36Mg0.14(Pod 4.8(CO3)1.2F2.5 39 48 Uncertain <br /> Fluorapatite Cas(PO4)3F 0 0 negligible <br /> Hydroxyapatite Ca.(PO4)30H 0 0 negligible <br /> Fe chlorohydroxide Fe(OH)2.1C11.1 =0 =0 negligible <br /> Goethite Fe00H =0 =0 negligible <br /> Barite BaSO4 =0 =0 negligible <br /> * Based on the liquid reaching zero supersaturation <br /> [Deposition of 1 mg/kg represents about <br /> one pound per day from 100 gpm.] <br /> **Natural protection via unfavorable reaction kinetics <br /> Nominal average injectate <br /> Seasonal high concentration (winter) <br /> DON MICHELS ASSOCIATES-Missoula,Montana USA <br /> 11 <br />