HYDRO24575 - Laserfiche WebLink

Home Browse Search

COLORADO DEPARTit1ENT OF PUBLlC HEALTH AND ENl7RONit1ENT, Water Quality Control Division Rationale -Page 4, Permit No. CO-0045161 3. Chemicals Used: The permittee indicated that there are products consunte~i on-site that have the potential to 6e in the effluent discharges. These products are summarized in the table below. The table shows whether the Division finds the chemicals acceptable for discharge at concentrations appropriate for the purposes intended. !n addition the permittee is aware that pit pumpage water will likely neea' cdditional treatment before it can be pumped to a pond. Settling with the aid of flocculations/coagulants for,~he outfalls designated with a "b" will occur in the pit. The permittee may also apply flocculanrs/coagulants to otttfalls designated with the letter "a " ro improve the quality of discharged waters. The permittee is testing var:orts flocculants/coagulants ro identify one or more efficient in settling out fine particles, coal fines and is also co: t effective. Whenever new products are identified that have the potential to get into the effluent discharges, rl:e permittee will submit the Material Safety Data Sheet (b1SDS) for the product to the Division for review and approval prior to use. Table IV I -Chemicals Chemical Name. ' ...:::... ;... ......:...:... use :.: : . :: . : .. : : . ,..:. . .. .. ;; . :: . Po .. is of :::: .:. ... ,. ,. .:.:>:: Contests...::'::::.::: :.. ccep . :: Unacceptdble:.. :: Dustcon Haulage dust control organics acceptable* United 228 Flaccularu settling aid not specified acceptable* United 556 Flaccufant settling aid not specified acceptable* Diversey IRS-3C Surfactant vehicle cleaning phosphoric acid acceptable* Magnesium Chloride deicing chloride acceptable* Calcium Chloride deicing chloride acceptable* BetzDearborn Klaraid coagulant not specified acceptable** PC1195 BettDearborn CEI i54 flocculanr petroleum distillate accepta6le* * acceptable for purpose requested and at or below cortcentrarions recommended by manufacturer -for discharge where dilution and/or detention will occur ** This chemical is very toxic to aquatic life. However, it is a cationic coagufant'with a chemical composition such that it binds up completely with solids, thereby remaining in the sludge and not in the water. On this basis, with proper application it will not add toxicity to a discharge. 77te chemical is acceptable for use up to a maximum application rate of 100 ppm (mg/P). B. Wastewater Treatment Description All wastewater ultimately discharged will, at a minimum, be treated through sedimentation ponds. Ibis primarily includes surface runoff, but also includes the potential for discharge of other sources as described below. All discharges may be intermittent. Thet non-Surface runoff sources also include good quafiry groundwater of unhtawn origin that flows to the Streeter Pond (ourfal( 001). In addition, outfall 008 may contain water from two natural springs and underdrain water with flows of less than 7 gpm from a ssstem installed as part of the West Pit Fi11 construction. Outfal[ 010 may also contain underdrain water and possibly at a future time, spoils spring water. Then permittee has stated that pit pumpage will likely occur in the future in signiftcant volumes far infrequent periods of :;hurt duration and would 6e discharged from one or more of outfalis 004, 007, 008. 009 and 010. There is no way to predict when this might occur as it is dependent on precipitation volumes. Internal discharge points are being estdblished in the permit to monitor the quality of the water pumped from the pits to the ponds. lhese internal points are designated with a "b"after the autfa[I number and correlate to the pond to which the pit water would be pumped. For example, outfal! 007b is pit water pumped to the Prospect Pond. whose ourfall to Good Spring Creek is designated as outfa[l 007a. See section VI. for elaboration on applicable effluent limitations and other conditions. Water that gravity flows across upper portions of pins and then flotivs out, eventually entering the surface runoff ditch system -without being pumped -is considered by rhz Division as surface runof,F Water that is pumped from a pit is "pit pumpage" or "pit water" subject to the requirements described for outfall.s c?esignatzd with a "b "'.