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r'4 ~'{M •+•. V' ~'~~` ~~ G McCulley Fnck Sc Gilman, ~~~ provldin• vlronmentdl consulting and engineering services ITEC Envirortmental Colorado, Inc. 9605 West 49th Avenue Suite 102 Wheatridge, CO 80033 Attention: Ms. Maxine Stewart III IIIIIIIII IIII III 999 DECEIVED r- '1~~ `hnt plviston of iviiCetals 8 Geology RE: GOLD HILL MILL -Gold Hill, CO FOURTH-QUARTER 1998 COMPLIANCE SURFACE Dear Ms. Stewart: & GROUND WATER MONITORING 4900 Pearl East Grcle Suite 300W Boulder, Colorado 80301 303/447-1823 Fox: 4d7-1836 January 8, 1995 MFG Project 5461 This letter report documents the field activities conducted by McCulley, Frick & Gilman, Inc. (MFG) in connection with the fourth-quarter groundwater monitoring at the Gold Hill Mill project site (Site) near Gold Hill, Colorado. These monitoring activities are in fulfillment of requirements for quarterly compliance monitoring of groundwater and surface water near the Gold Hill Mill, as required by the Colorado Division of Minerals and Geology. Monitoring activities were performed in accordance with MFG Standard Operating Procedures (SOPs), adapted as necessary to accommodate as-encountered field conditions. FOURTH-QUARTER GROUNDWATER SAMPLING Groundwater sampling activities were conducted at the Site by MFG personnel on December 16. 1998. Groundwater samples were collected from four monitoring wells (Well lJl. Well MZ, Well J13, and Well N4). Additional groundwater samples were taken from the Hazel A adit and the fresh water holding tank located inside the mill building. The fresh water holding tank is fed by groundwater pumped from [he Wynona mine and therefore represents the Wynona groundwater sample. Respective sampling locations are shown on Figure 1. Initial water levels for each well were measured to the nearest 0.01 foot from the top of the well casing (TOC) using a Solinst electronic water level meter prior to commencing [he sampling procedures. The water level probe was decontaminated at the beginning of the sampling event and prior to sampling each subsequent monitoring well. Decontamination was accomplished by washing the probe with anon- phosphate detergent and distilled water solution, and rinsing twice with distilled water. Water level data obtained during the fourth-quarter is presented in Table 1, attached. After measuring the water level in each well, the respective wells were sampled by lowering a dedicated polyethylene bailer, suspended by nylon rope, into the well. Due [o the large casing diameters (typically 6 inches), the depth of water in the wells (typically in excess of 30 feet), and the slow recharge a~ r6 w Albuquerque. NM Austin. TX • Boston. MA • Boultler, CO • Missoula. MT • port Lavaca. TX • San Francisco. CA • Segrne. WA • Wallace, ID ~t.