ISFAPPC04246 - Laserfiche WebLink

Home Browse Search

~, , 1.2 Description of Study Area Fourmile Creek originates in the mountains north of the town of Cripple Creek in Teller County. In 1994 three sites downstream of the Cripple Creek and Fourmile Creek confluence were sampled (Table 1 and Figure 1), In 1995 due to the DOWs need for additional fisheries information, Fourmile Creek was sampled from the headwaters to a point approximately eight river miles upstream of the confluence with the Arkansas River in Canon City, Data from this additional 1995 . . .. -.. " ~,.,' -~ r" ..--.'::::5' .'C' sampling were Included In this report. ". From 1996 on, the Fourmile Creek aquatic community will be monitored at four sites in a downstream gradient. The upstream control site will be Fourmile Creek upstream of Cripple Creek on the Chapman Ranch. Fourmile Creek downstream of Cripple Creek will be used to evaluate the effects of Cripple Creekwater on Fourmile Creek, Fourmile Creek downstream of the Carlton Tunnel will be sampled to evaluate effects of the tunnel. Fourmile Creek at the Lion's Club stream restoration project (8 miles north of Canon City) will be used as a downstream control site. '-) ':-. , ~""""'! Cripple Creek and Ariqua Gulch will also be sampled each year at the four 1995 DOW sites described in Table 1 and Figure 1., 2.0 Methodology 2.1 Water-Quality Water-quality samples were collected prior to macroinvertebrate and fish collection. Alkalinity, hardness, conductivity, temperature and pH measurements were performed in the field using titration methodology (Standard Methods 1985), a Yellow Springs Instruments conductivity meter and a Beckman Phi 10 pH meter. Meters were calibrated each time before use, Samples were collected for the analyses of both dissolved and total cadmium, copper, iron, manganese, lead and zinc, A two-ounce aliquot of water from each site was field filtered through a 0.45 micron disposable Nucleopore filter, using a reusable plastic syringe device and analyzed Jor determination of the dissolved metal. Each sample was preserved with 0.5 ml Ultrex nitric acid and placed in ice for transportation to the DOW Fort Collins laboratory for analyses by atomic absorption spectroscopy. ,- l';' ~."', ....:~...;.. A second, two-ounce aliquot was preserved using Ultrex without filtration, iced and transported to the DOW Fort Collins laboratory to be analyzed for total metals. Since this second sample was not digested in a further manner, a better term may be acid leachable fraction. Dissolved metals represent the fraction of each contaminant that is biologically available to aquatic life. The total fraction represents what could realistically become available under anoxic (oxygen-depleted) conditions in nature. A duplicate sample and 2 I I I I I I I I I I I I I I I I I I ,