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4 Y Ground Water Indicator Parameters: The following chemical constituents will be used as ground water indicator parameters and will be measured when sampling ground water: Parameter/Constituent Report in Units of Sampling Frequency Specific Conductance Ermhos/cm Quarterly pH Chlorides pH Units mg/l Quarterly Carbonate mg/l Quarterly Quarterly Bicarbonatemg/1 Quarterly Nitrate (as N) mg/l Quarterly Sulfate mg/1 Quarterly Sodium mg/1 Quarterly Calcium mg/l Quarterly Magnesium mg/l Quarterly Potassium mg/l Quarterly Dissolved Iron mg/1 Quarterly COD mg/l Quarterly Total Kjeldahl Nitrogen (as N) mg/1 Quarterly Volatile Organics mg/1 or Ng/l Semiannually Hydrogen Sulfide (gas) presence or Quarterly absence ICAP for the following: Copper mg/l or Ng/l Annually Cadmium mg/l or Ng/l Annually Lead mg/l or pg/l Annually Zinc mg/l or Ng/l Annually Barium mg/l or Ng/l Annually Cadmium mg/l or Ng/l Annually Chromium (Total) mg/l or Ng/l Annually Magnesium mg/l or pg/l Annually Manganese mg/l or Ng/l Annually Nickel mg/l or Ng/l Annually Silicon mg/l or Ng/l Annually Silver mg/l or Ng/l Annually AA for the following: Mercury mg/1 or Ng/1 Annually Arsenic mg/l or ug/1 Annually Chromium (Hexavalent) mg/l or Ng/l Annually Selenium mg/l or jig/1 Annually EPA Methods 502.1 and 503.1, or 502.2, or Method 524.2 will be used to characterize volatile organics. All peaks will be reported. Unidentified peaks shall be confirmed with Method 524.2. Metals shall be analyzed and reported as totals (except for chromium). The Discharger shall determine at each sampling whether there is a statistically significant increase over water quality protection standards for each parameter and constituent analyzed.