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During each monthly sampling, in-situ water quality measurements of temperature, <br /> conductivity and pH were made using a Hydro Lab Model 4000 field sampling kit. An <br /> expanded list of water quality parameters was collected during the quarterly and annual <br /> samplings which were sent to Core Laboratories, Inc., of Denver for laboratory analysis. <br /> Filtration of certain water quality parameters was accomplished in the field with a <br /> Geotech 2.4 liter barrel filter. <br /> Quality control of water analyses was performed by two methods. Prior to any field <br /> sampling, the Hydro Lab Sampling Kit was calibrated to known standards produced in the <br /> laboratory. A record of each calibration was kept as to the date, person performing the <br /> calibration, and adjustments made. Core Laboratories, Inc. maintains internal quality <br /> control of sample handling and instrumentation calibration. During the November <br /> sampling, one of the samples was split in the field and half was submitted to the lab as a <br /> blank. Analyses were compared and all were found to be within five percent. <br /> Water quantity or flow measurements were conducted by a number of methods. At <br /> the beginning of the program, a straight, flat, stable reach of each stream station was <br /> selected as a sampling location. Near the downstream end of the reach, a cross-section <br /> was surveyed perpendicular to the stream flow and permanently marked with stakes and <br /> flagging. Flow was measured with a Teledyne-Gurley Model 625 Pygmy type current <br /> meter using the USGS six-tenths-depth method. During 1985 at the Purgatoire River <br /> stations, staff gages were established on bridges above, between and below the two mines <br /> providing data to calculate a stage-discharge curve for future discharge measurements. <br /> These curves will be developed following the spring 1986 high flow events. At the mine <br /> discharge stations, discharge was measured by the pump ratings or by a direct volumetric <br /> measurement with a calibrated container. In Apache and Santistevan Canyons, calibrated <br /> flume stations were constructed and Stevens Type F continuous recorders were installed. <br /> During each visit to these two stations, the recorders were visually inspected and <br /> maintained. This included: <br /> 1. Checking to see that the clock mechanism was functioning properly and marking the <br /> recorder charts with data points; <br /> 2. Comparing the staff gage reading and recorder stage height to verify proper <br /> functioning of the stage recorder; <br /> -7- <br />