2017-04-11_REPORT - M1977424 ‎(2)‎

• Permit No: M1977424
• IBM Index Class Name: Report
• Doc Date: 4/11/2017
• Doc Name: Annual Fee/Report/Map
• From: Occidental Oil Shale, Inc.
• To: DRMS
• Annual Report Year: 2017
• Email Name: THM
• Media Type: D
• Archive: No

Logan Wash Mine Annual Report
Permit No. M-1977-424
Vault (LW -002); 4) precipitation; 5) monitoring of the Evaporation Pond leak detection system;
and 6) Daylight Bench stability monitoring. Monitoring data for the reporting period are shown in
Table 4.
3.1 CDPS (NPDES) Permit Termination
The former CDPS permit for Logan Wash Mine (permit no. CO0048816) that permitted two
outfalls, Outfall 001 (Logan Wash Mine, main lower portal [L1 Portal] discharge) and Outfall
002 (Research Mine discharge), was terminated on July 1, 2014. Any mine discharge from the
former outfalls is being infiltrated into the Lower Mine Bench. For more information regarding
the Research Mine portal closure and management of the Research Mine drainage see TR No. 4
and TR No. 6, which present significant revisions to Exhibit E, the Reclamation Plan for Logan
Wash Mine.
3.2 Mine -Water and Retort -Water Discharge
Discharge measurements of mine water discharge (former Outfall 001) and retort water discharge
were conducted on a quarterly or more frequent basis when access allowed. Continuous flow
(meter) monitoring of Outfall 001 water came on line in August, 2011 as part of a requirement of
the former CDPS permit. These data were collected by OOSI to assess and evaluate mine closure
effectiveness, to support operation and maintenance of the Evaporation Pond and future water
management options, and meet state requirements. The flow meter is still operating and data are
periodically recorded and data logger downloaded per the schedule described above. Table 4
shows the results of monitoring data collected at the mine in 2016, and Figure 5 shows the results
for the Outfall 001 flow meter (LW -001 mine water discharge).
3.3 Water Quality Monitoring
Water quality monitoring continued at the mine site on a semi-annual schedule. Sampling was
conducted of mine discharge waters, the mine water and the retort water, groundwater at two well
locations, and surface water at one spring site in May and October, 2016. Sampling of retort mine
drainage water and mine water (former Outfall 001) is conducted to evaluate mine discharge
water quality with time in support of final mine closure. The samples were collected from the
retort water and mine water drainage pipelines inside the Lower Bench Vault.
Historical and 2016 analytical results for mine water (LW -001), retort water (LW -Retort), and
Well LWCW-IA are shown in Tables 5, 6, and 7, respectively. The analytical results for samples
collected during the reporting period do not indicate a significant improvement of retort water
quality compared to past sampling events.
One of the locations, "Big Seep", is considered to be a potential source water of mine water
discharge. "Big Seep" emanates from the rock wall above the Daylight Portal and was sampled in
May and October of 2016. In addition, samples were collected from Well LW -22A, an alluvial
well located in Logan Wash located approximately 2.25 miles down Logan Wash from the mine.
Samples of the retort water flowing through the Lower Manhole (LW -LM) were also collected.
Locations sampled during the 2016 semi-annual sampling events are shown in Figure 6.
Analytical data from all of these samples are shown in Table 8.
Western Water & Land, Inc. 7