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III IIIIIIIIIIIIIIII <br />ROCKY MOUNTAIN CONSULTANTS, INC. <br />~~~~ <br />t <br />Inc <br />November 2, 1999 <br />Mr. Michael J. Hart <br />2255 Meadow Avenue <br />P.O. Box 1303 <br />Boulder, Colorado 80306 <br />Premiere Builtling <br />825 Delaware Ave.. Suite 500 <br />Longmont, CO 80501 <br />(303) 772-5282 <br />Metro (303) 665-6283 <br />FAX (303) 665-6959 <br />(first initial, last Home)@long.rmcco.com <br />Re: Description of Groundwater Sampling, Water Level Measurements, Maintenance and Data <br />Management for the Hydrogeologic Monitoring System at the Western Mobile Lyons Pit, <br />Boulder County, Colorado; RMC Job No. 19-1448.033.00 <br />Dear Mike, <br />This letter is a summary of our current monitoring program for the hydrogeologic monitoring system at <br />the Lyons Pit in Boulder County, Colorado, as shown on Figure 1. The system consists of wells <br />installed in the alluvium and staff gauges in ponds, irrigation ditches and St. Vrain Creek. These <br />monitoring points have been installed periodically since 1994. Monthly water level measurements are <br />obtained from all wells, and groundwater sampling is performed in select wells semi-annually. This <br />work is performed by Rocky Mountain Consultants, Inc. (RMC) personnel. The data obtained is <br />reviewed and entered into our database for the site. <br />RMC furnishs all labor and equipment to perform the following: <br />1. Measure monthly groundwater levels in wells PZ-1 through PZ-38 and the domestic <br />well at the Zapf residence. <br />2. Measure monthly water levels at the staff gauges located near the wells. <br />3. Semi-annua4 collection of groundwater samples for laboratory analyses from wells PZ- <br />7, PZ-11, PZ-12, PZ-16, PZ-23, PZ-26, PZ-27, and PZ-37. <br />4. Maintenance of the well locations on a monthly basis. During the previous year of <br />monitoring the water levels, several incidents occurred where the well installations <br />were damaged by farm machinery due to their poor visibility. Routine maintenance of <br />each installation could mitigate damage to the wells. This work would include <br />painting, simple repairs, surveying, and clearing debris and vegetation from the <br />proximity of each installation. <br />S. Input monthly water elevations and semi-annual analytical results into a Quattro Pro <br />spreadsheet. <br />6. Deliver samples to the laboratory under chain of custody for analyses. <br />CIVIL AND ENVIRONMENTAL ENGINEERING PLANNING <br />