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representative of the monitored activity. The method IN- <br /> used <br /> used to obtain a representative sample of the fluid to be <br /> analyzed and the procedure for analysis of the sample are <br /> as follows: <br /> (a) Wellhead Injection Water <br /> (i) Grab samples shall be collected at the sampling <br /> valve at the wellhead and used for laboratory <br /> analysis for physical and chemical <br /> -_ characteristics. <br /> 3 . Injection Fluid Analysis Injection fluids shall be <br /> analyzed no less frequently than indicated for the <br /> following parameters: <br /> Monitorincf <br /> Parameter - Frequency Sample Type <br /> specific gravity, unitless Quarterly grab <br /> conductivity, mhos Quarterly grab <br /> hardness, mg/l as CaCO3 Quarterly grab <br /> total dissolved solids, mg/l Quarterly grab <br /> pH, standard units Quarterly grab <br /> Arsenic Quarterly grab. <br /> Barium Quarterly grab <br /> Boron- Quarterly grab <br /> Cadmium Quarterly grab <br /> Calcium Quarterly grab <br /> Chloride Quarterly grab <br /> Chromium Quarterly grab <br /> Copper Quarterly grab <br /> Fluoride Quarterly grab <br /> Lead Quarterly grab <br /> Magnesium Quarterly grab <br /> M-Alkalinity Quarterly grab <br /> Mercury Quarterly grab <br /> Nitrate Quarterly grab <br /> Potassium Quarterly grab <br /> Selenium Quarterly grab <br /> Silver Quarterly grab <br /> Silica Quarterly grab <br /> Sodium Quarterly grab <br /> Sulfate Quarterly grab <br /> Vanadium Quarterly grab <br /> Zinc Quarterly grab <br /> Benzene Quarterly grab <br /> Toluene Quarterly grab <br /> Trichloroethylene Quarterly grab <br /> Phenol Quarterly grab <br /> Page 11 of 29 <br /> UIC Permit #CA194000002 <br />