2010-04-20_REVISION - M1977300 (9)

Home Browse Search

Cotter Corporation PROCEDURE Number: 3-4 Schwartzwalder Mine Page: 5 of 7 Golden, Colorado WATER MONITORING Revision: 7 Date: 04/15/2010 Schwartzwalder Water Sampling Program Surface water sampling at the Schwartzwalder Mine is carried out on a monthly schedule. Groundwater sampling is conducted on a quarterly basis. Quarterly samples are also collected from mine refill water, when weather and access conditions allow (snow/freezing conditions in winter can prevent mine pool sampling). Three different analytical strategies are required for the samples, each strategy is detailed below. SURFACE WATER • Six sampling locations (excluding the VhVTP discharge point as this is no longer operational). • Four locations have a limited analytical suite. Two locations have an extended suite. The locations for which the extended suite is requested changes each month. • The limited analytical suite calls for dissolved and suspended U and Ra 226. Sample size is 3 liters that is filtered and acidified. • The extended analytical suite calls for 29 parameters, listed below. Minimum sample size is 1 gallon filtered and acidified, 1 liter raw and acidified, and 1 liter raw. Samples collected during the last month of each quarter are analyzed for both dissolved and suspended U and Ra 226. • MAJOR IONS LDL Alkalinity, Total as CaCO3 1.0 mg/L Calcium Bicarbonate as HCO3 1.0 mg/L Magnesium Chloride 3.0 mg/L Potassium Sulfate 5.0 mg/L Sodium PHYSICAL PROPERTIES LDL Total Dissolved Solids 10 mg/L METALS TOTAL LDL Aluminum 0.20 mg/L Antimony 0.001 mg/L Arsenic 0.10 mg/L Copper 0.005 mg/L Lead 0.005 mg/L Manganese 0.01 mg/L Mercury 0.0001 mg/L Silver 0.001 mg/L Iron 0.03 mg/L Thallium 0.001 mg/L Zinc 0.005 mg/L RADIONUCLIDES DISSOLVED LDL Radium 226 0.2 pCi/L METALS DISSOLVED Aluminum Antimony Copper Iron Manganese Molybdenum Thallium Uranium 0.10 mg/L 0.10 mg/L 0.10 mg/L 0.10 mg/L LDL 0.20 mg/L 0.001 mg/L 0.005 mg/L 0.03 mg/L 0.01 mg/L 0.005 mg/L 0.001 mg/L 0.0002 mg/L 0