REP48681

• Permit No: M1988112
• IBM Index Class Name: Report
• Doc Date: 3/27/2003
• Doc Name: Annual Report
• Permit Index Doc Type: Annual Fee / Report
• Media Type: D
• Archive: No

BMRI San Luis Project
CDMG Annual Report
March 20, 2003
Page 4
permit or water decree (i.e., twice per year). This increased monitoring and analysis was
conducted in cooperation with the San Luis Water and Sanitation District. Laboratory
analytical reports were distributed to the applicable parties.
Tailing facility underdrain flows were monitored monthly at the base of the embankment to
determine the rate of underdrain return flow to the collection pond. The 2002 mean annual
underdrain flow was 44.34 gpm.
Stream staff gauges (RS-1, RS-2, RS-3, RS-4, RS-5, RS-6) were inspected daily from April
through June with weekly inspections conducted during the other months. RS-4 and RS-6
remains to be dry. The staff gauges received routine maintenance during the year. Staff
gauge measurements were reported to the Division in the monthly reports.
As specified in the TR-031, monthly pond analysis was reported to the Division.
The tailings embankment piezometers were inspected monthly. Each of these installations
either remained dry or contained less than 12 inches of water accumulated within the
piezometer casing. Results of these inspections were reported to the Division on a monthly
basis in the monthly reports.
The collection pond leak detection system was evacuated monthly and sampled and
analyzed quarterly in accordance with TR-31. Laboratory analytical reports were submitted
to the Division upon receipt from the laboratory. The collection pond leak detection system
return flow rate averaged 31.76 GPAD for 2002.
Water treatment plant sludge management was conducted twice during calendar year 2002.
Approximately 1,200 tons of sludge material was transported from the water treatment
plant to the tailing facility. This material was transported on March 20~' and September 21"
and 22°`~, 2002. These sludge management activities were included in the monthly reporting
to the Division.
Technical Revisions
BMRI continued implementation of TR-26 as approved on May 23, 2000. BMRI has been
actively managing the West Pit hydrologic system since July 1999, and the water
management plan developed in TR-26 has been fully implemented according to schedule.
The water management techniques employed since the submission of TR-26 to CDMG has
reversed and maintained the West Pit hydrologic gradient at a ground water elevation (8582
ft amsl) below the Rito Seco streambed channel since February 8, 2000 eliminating