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• <br />~~~ <br />LUKE J. RUSSELL <br />CORPORATE MANAGER -ENVIRONMENTAL AFFAIRS <br />November 15, 1993 <br />Mr Allen Sorenson <br />State of Colorado <br />Division of Minerals and Geology <br />1313 Sherman St. Room 215 <br />Denver, CO 80203 <br />Re: Bulldog inspection Report <br />Dear Allen, <br />• iii iuiiiiiiiiiiiii~ <br />999 <br />~J <br />~~~ 18 1983 <br />~';:;~. <br />~•. ~, . <br />Further to our discussions this letter responds to the <br />observations made in the recent inspection at the Bulldog Mine in <br />Mineral County, Colorado (inspection report received September 30, <br />1993). <br />Vent Raise <br />The vent shaft was closed per our description in the field <br />during the site inspection. Unfortunately, we had completed the <br />vent closure prior to receiving your inspection report and no <br />pictures were taken during closure activities. <br />Lower Tailincxs <br />The lower tailings breach slopes were permitted to be 1.5:1 as <br />constructed during your site inspection. The area had been seeded <br />and germination and plant emergence was occurring shortly after <br />your inspection. However, to address your concern, the slopes have <br />been further reduced to 2:1 and reseeded. Homestake is very <br />confident that successful revegetation will occur on these slopes. <br />The diversion structure around the lower tailings impoundment <br />was designed, permitted and constructed to pass the 100 year, 24 <br />hour event (2.8 inches). As requested, a hydrologic evaluation was <br />conducted for all the diversion systems at the Bulldog Mine. As <br />presented in Attachment A the diversions around the lower tailings <br />impoundment, as constructed, will safely pass the designed and <br />permitted 100 year, 24 hour storm event. As discussed further in <br />this letter Homestake does not believe that the PMP event is <br />appropriate for this project. As the 100 year event was the <br />permitted event and that the existing structures are functioning <br />without erosion, re-construction to meet the PMP event should not <br />be required. The PMP event would require placement of 14 inch mean <br />1 <br />HOMESTAKE MINING COMPANY <br />650 CALIFORNIA STREET • SAN FRANCISCO • CA 9L10B Z]BB f<15) 98~-Bi50 <br />