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BMRI San Luis Project CDMG Annual Report March 2002 Page 3 analytical reports were transmitted to the Division upon receipt from the laboratory. Weekly and bi-weekly sampling, in accordance with NOV abatement requirement No. 3 was conducted during the year until final TR-31 Division approval was received. With this approval and requested monitoring modifications, the monitoring schedule and reporting was adjusted in accordance to the permit conditions and requirements approved in TR-31. Piezometer water level measurements were conducted throughout the year in accordance with the permit frequency schedule. Laboratory analytical reports were submitted to the Division upon receipt from the laboratory. Lysimeters were inspected quarterly and reported to the Division. The lysimeters remained dry throughout the year. Groundwater sampling and analysis of the San Luis town wells and Shalom Ranch well was conducted throughout the year on a more frequent basis than required by the CMLRB 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 2001 mean annual underdrain flow was 37 gpm. Stream staff gauges (RS-1, RS-2, RS-3, RS-4, RS-5, RS-6) were inspected daily from Apri] through June with weekly inspections conducted during the other months. RS-4 and RS-6 remain to be dry. The staff gauges received routine maintenance during the year. Staff gauge measurements were reported to the Division in the monthly reports. The tailings embankment piezometers were inspected monthly. Each of these installations either remained dry or with less than 12 inches of water accumulated within the piezometer casing. Results of these inspections were reported to the Division on a quarterly basis in the monthly reports. The collection pond leak detection system was pumped, sampled and analyzed monthly until approval of TR-31, at which time the sampling and analysis frequency was adjusted to quarterly in accordance with the TR-31 conditions and requirements. Laboratory analytical reports were submitted to the Division upon receipt from the laboratory. The collection pond leak detection system return flow rate averaged 38.9 GPAD for 2001.