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Lnrririta Q:n ~'rr. ll;nt SuRCrr '•C,prr rtri; r., i,:( R,roart Water Quality Water quality a[ the site was determined by monitoring of stations designed to determine if any impacts result from the proposed tnining activities. Stations were sited according to the proposed mine layou[ and subsequently monitored monthly for field parameters and quatterly for anahtical parameters. At each station a crest gauge, sediment sampler, and alluvial monitor well were installed (see [he Groundwa[er Technical Report). In addition, each si[e was surveyed for cross- sections as described above. Specific methodologies related to water quality standards determination, field parameters collection, and water quality sampling are described below. Applicable water quality standards were determined from a review of the Colorado Depattment of Heal[h- Water Quality Control Commission Classification and Numeric Standards for the Arkansas River Basin. The particular drainages in the project area tall within the lower Arkansas River Basin, stream segment Sa. Comparison of analytical results from the site sampling da[a is made to these standards. The water quality monitoring program was designed ro determine baseline conditions above and below projec[ed disturbance areas. Sampling and Analytical Methodology • During each monthly event, readings were obtained from crest gauges and flows determined at each station. Sediment samplers were examined for water collection. At each site field parameters were obtained at stations with water. Field parameters were determined either via a Hydac pH/conductivity/temperature meter, or an Orion pH/temperature meter and an Orion conductivity/temperature meter immediately at each monitoring station in accordance with 40CFR 136. Dissolved oxygen measurements were obtained utilizing a YSI model SOB dissolved oxygen meter. Each of the sampled parameters were detetmined by obtaining a sample of the water with a decontaminated beaker, and placing the probes in this sample for measurement. Samples were obtained from flowing water where possible. Decontamination of all equipment was performed by tirst rinsing the equipment with tap water, then washing with aphosphate-tree detergent, then rinsing the equipmen[ with deionized water. Samples were obtained using the laboratory provided sampling containers. where possible. Each container was lowered in[o the water and filled gently, wi[hout rinsing out the preservative. For samples requiring field filtration, filtration vas accomplished by use of a barrel filter with a 0.45 micron filter. Preservation and filtrations were performed according to Table S~V-1. • ,~; ,-: o,,..,,,,.h«,. ,~,,,,, 4 i revised 6/30/97)