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Rpr 28 98 06:09p • • p,3 E I ENVIRON117~NTAL INVESTIGATIONS, INC. 11781 Ranch Elsie Rd. Golden, CO 80403 (303)642-3957 April 27, 1998 Ms. Maxine Stewart ITEC Environmental Colorndu Inc. 707 17th Strttt. Suite 3120 Denver, CO 80202-3404 Deaz Ms. StcwarC Enclosed is a table showing the field parameters measured as required by the Colorado Division of Minerals and Gcolog}• for the required quancrly sampling of the monitoring wells at the Gold Hill Mill. These samples were taken by Environmental Investigations, inc. as an objective third party. Also, per your request, a description of the sampling event follows. Description of Sampling F.vent: On Moch 28, 1998 wells one (1) through four (41 were measured for depth to groundwater. On March 31, 1998 all wells were capped and locked upon our arrival. We attznrpted to purge the wells of three casing volumes to collect samples represeitfativc of the groundwater in these wells Tltese sis t67 inch caging wells would require purging of w substantial quantities in order to properly take the samples Attempts [o purge the wells through a siphon system were unsuccessful, in part due to inclement conditions at the site. As a result, samples were taken of the water standing in the iron casings. A decontaminate) l'zllun hand bailer wish a v-uMCh [op was plunged into [hc water surface and dropped as rapidly as possible through the water column in an attempt to allow depth imegration of the sample in hopes of collecting a sample more representative of nvcrell well conditions The edit sample was a grab sample collected approximatzly 50 feet into the adit behind the bulkhead, which was full az the time of sample collection. Also, a duplicate sample was taken at this rime. The collection pond sample was a greb sample taken by the inflow pipe, wh~clt was Flowing at the time of collection, as the rzmainder of the pond was covered in ice. The grab samples et Lefl Hand Creek were taken just ahovt the bridge at Lick Skillet Road. Samples at all sites were collected in Iwo (2) bottles prepared by Hazen Research Inc. laboratory. The sample bottles were picked up at the lab the morning of the sampling event. All samples were immedis[ely placed in a cooler packed with snow as collected and returned to thz lab the following day as pzr lab direction. Also enclosed is the Chain of Custody Record (via marled copy of this lance only). If you have any yuestinns or rcquim (urthcr information or guidance please Ceel Crec to call. Our offices will be close) Gom Thursds• April 30 through Tuesday, May 12. Sincerely, ~' Bruce J. Bevtrt enc BJB/mkb