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Logan Wash Mine Annual Report
<br />Permit No.: M-1977-424
<br />USA under COGCC regulations. OOSI and OXY-USA will provide DRMS with required
<br />documentation of this change in land use and permit jurisdiction as agreements and other permits
<br />are finalized.
<br />OOSI anticipates requesting release of warranty for Areas 1 (12.36 acres), 2 (0.74 acres), 4 (4.26
<br />acres), and 10 (0.24 acres), the revegetated portions of Area 13 (1.26 acres), the "Lower Dump
<br />Toe" (estimated to be 1.64 acres), and the Soil Barrow Area (0.65 acres) by Fall of 2009. These
<br />areas total approximately 21.1 acres.
<br />On August 29`", 2005, DMG conducted a site inspection of lands meeting reclamation
<br />requirements. The visit was originally requested by OOSI in January of 2005 and was revised in
<br />a letter of January 4`", 2006. On January 12`", 2006, DMG released OOSI from further
<br />reclamation responsibility for Areas 6, 8, 9, 12, 14, 15, 16, 17, 19, 20 and a portion of Area 13
<br />(roads).
<br />3.0 Monitoring Activities in 2007
<br />Monitoring activities at the Logan Wash Mine during the reporting period consisted of periodic
<br />monitoring of mine water discharge and related sampling activities when necessary. These
<br />activities included (1) required flow monitoring and sampling of two National Pollution
<br />Discharge Elimination System (NPDES) outfalls on weekly, monthly, and quarterly schedules,
<br />(2) measurement of flow rates of the mine-water discharge and retort-water discharge on a
<br />quarterly basis, and (3) periodic measurement of climatic parameters (temperature and
<br />precipitation) on the Lower Bench. The latter two monitoring activities are voluntary. In
<br />addition, when the Research Mine drainage pipe was shut-in, OOSI monitored head inside the
<br />Research Mine through the use of a manometer installed in the Research Mine Vault. Monitoring
<br />data are shown in Table 4.
<br />3.1 NPDES Outfall Sampling
<br />Two NPDES outfalls, administered by the Colorado Department of Public Health and
<br />Environment (CDPHE), were monitored in accordance with permit-established schedules.
<br />Outfa11001 (Logan Wash Mine, main lower portal [L-1 Portal) discharge) and Outfa11002
<br />(Research Mine discharge) are to be monitored weekly for pH, flow rates, total dissolved solids
<br />(TDS), and total suspended solids (TSS); monthly for TDS, TSS, pH, nitrate, sulfate, fluoride,
<br />ammonia, COD, boron, oil and grease, and phenols; and quarterly for TDS, TSS, pH, nitrate,
<br />sulfate, fluoride, ammonia, COD, boron, arsenic, copper, lead, oil and grease, and phenols.
<br />Monitoring is required at Outfall 001 when mine-water drainage from Logan Wash mine reaches
<br />a flume in "Dry Gulch" at the OOSI and BLM property boundary. Prior to 2005, monitoring was
<br />required at Outfa11002 when flow was present in a pipe discharging mine water from the
<br />Research Mine near the portal entrance. In the summer of 2005, OOSI constructed a mine
<br />drainage pipeline from the Research Mine to the top of the stormwater channel on the northern
<br />portion of the Lower Bench (see Technical Revision No. 6). This work was done to locate both
<br />outfalls in the upper part of Dry Gulch, so that the monitoring requirement at the downstream
<br />flume would apply to both outfalls.
<br />Sampling was not conducted at Outfalls 001 and 002 during the reporting period because of no-
<br />flow conditions at the designated outfall point (flume). Quarterly NPDES Discharge Monitoring
<br />Reports were submitted to the CDPHE for Outfalls 001 and 002 during the reporting period.
<br />Western Water & Land, Inc. 4
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