REP02924

• Permit No: C1981014
• IBM Index Class Name: Report
• Doc Date: 7/10/1990
• Doc Name: 1988 AHR
• Annual Report Year: 1988
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

of record was 178 of the previous annual discharge quantity, due
in part to the low rainfall received in the Southfield Mine area.
Discharge water quality was monitored by sampling procedures in
compliance with Southfield's Colorado Wastewater Discharge Per-
mit. For all permit outfall locations, quality limitations are
as follows:
Total Suspended Solids (TSS):
35 mg/1 (daily); 70 mg/1 (30 day ave.)
Total Iron:
3.5 mg/1 (daily); 7.0 mg/1 (30 day ave.)
pH (field):
6.5 to 9.0
For the period of record, the combined average quality of dis-
charges was 15 mg/1 TSS, 0.65 mg/1 total iron, and pH values from
7.2 to 8.2 (refer to Table 4). No permit parameter limitations
were exceeded for the period of record.
WATER BALANCE AND CONSUMPTIVE USE
The total annual consumptive use at the Southfield Mine is esti-
mated at 36.2 AC~FT for the period of record of this report.
Table 7 depicts consumptive use locations at the Mine and summar-
izes monthly and annual usage. The methodology of determining
each consumptive use is fully described below,
Present water use and water handling systems are shown in schema-
tic form on Figure 2. The diagram details sources of water,
water uses, discharges from the Mine and consumptive uses. Water
meter records are maintained on a monthly basis at the Mine and
are documented on Table 1 and Table 3.
Coal Preparation Plant
Consumptive water use at the coal Preparation Plant is derived
from cleaning the raw run-of-mine coal utilizing heavy media and
riffle table separation. The annual consumptive use is estimated
at 20.4 AC-FT for the period of record (refer to Table 5). Con-
sumptive use occurs as water added to the output products: clean
coal and refuse; evaporation from the "Black Water" storage pond;
and outside equipment washing.
Water balance calculations are utilized to determine the amount
of consumptive use. For the period of record, the amount of
water entering the Plant contained in 565,700 tons of raw coal
was 43.7 AC-FT. The amount of water leaving the Plant in the
clean and refuse products, including pond evaporation and washing
water, was 64.1 AC-FT. Consumptive use is considered to be the
difference between the total output water and water entering the
Preparation Plant, shown on Table S. Values used for product
moistures are derived from individual product laboratory
analysis.