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,'- M~~3. <br />..'- <br />F <br />G <br />consulting <br />scientists and <br />engineers <br />ITEC Environmental Colorado, Inc. <br />3182-A Mesa Avenue <br />Grand Junction, CO 81504 <br />Attention: Ms. Maxine Stewart <br />RECEIVED <br />MFG, Inc. <br />4900 PeOrl Eost Circle <br />Suite 300W <br />Boulder, CO 80307-61 7 8 <br />303/447-1823 <br />Fox: 303/447-1836 <br />JAN 0 2 2001 <br />Division of Minerals and Geo1o9Y <br />August 7, 2000 <br />MFG Project 5461/010048 <br />RE: GOLD HILL MILL -Gold Hill, CO <br />ANNUAL WATER SAMPLING - 2000 <br />Dear Ms. Stewart: <br />This letter report documents the field activities conductedby MFG, Inc. in connection with the 2000 <br />annual water monitoring at the Gold Hill Mill project site (Site) near Gold Hill, Colorado. This monitoring <br />event is in fulfillment of a requirement for annual, compliance water monitoring near the Gold Hill Mill, as <br />requiredbytheColoradoDivisionofMineralsandGeology. Water samplingactivitieswereconductedatthe <br />Site by MFG personnel on July 25, 2000. One groundwater sample was collected from monitoring well, Well <br />#1, and a water sample was taken from inside the Hazel A adi[. Monitoring activities were performed in <br />accordance with MFG Standard Operating Procedures (SOPS), adapted as necessary to accommodate as- <br />encounteredfieldconditions. Detailsofthesamplingproceduresandthetabulatedfielddataarepresented <br />below. <br />Prior to sampling Well #1, an initial water level was measured to the nearest0.01 foot from the top <br />of the well casing (TOC) using a Solinst electronic water level meter. The water level probe was <br />decontaminated prior to use, using anon-phosphate detergent and distilled water solution, and rinsing twice <br />with distilled water. After measuring the water level, the well was sampled by lowering a dedicated <br />polyethylene bailer, suspended by nylon rope, into the well. Due to the large casing diameter (6 inches), the <br />depth of water in the well (in excess of 15 feet), and the slow recharge rate to the well, the standard practice <br />of purging three casing volumes of waterprior to sampling was omitted. Three bailer volumes (approximately <br />3 liters) were removed from the well to ensure adequate sample volume. The sample from the Hazel A adit <br />was collected directly from a ponded area of water, approximately 15 feet inside the adit portal. At the time <br />of sampling, water in the adit was flowing over the bulkhead and collectingbehind asand-bag dam. Water <br />was not flowing outside the adit portal. Water samples were collected in a temporary container that had been <br />cleaned with a dilute nitric acid solution and rinsed with water from the sample collection location. Sample <br />aliquots were pumped from the temporary collection container into appropriate laboratory-supplied containers <br />using a peristaltic pump and silicon tubing. All of the samples were field filtered for dissolved analyses by <br />pumping the sample aliquots through a O.45µ in-line disposable filter. The filter was purged with <br />1:5461 W NN2000.LTR.wpd <br />~~ <br />m,rea ~, <br />California Colorado Idaho Massachusetts • Montana New Jersey • New Mexico Pennsylvania • Texas • Washington Po,,, <br />