2009-02-09_REVISION - M2001077 - Laserfiche WebLink

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8) Please see attached seed mix substitutions for the revegetation. These substitutions were acquired from the NRCS. 9) Refer to item 4 above for mining phases. The reclamation phases will coincide with the mining phases. Also, see Exhibit E for slope and reclamation plan. Reclamation will begin after Phase II of the mining plan is complete (Phases shown on Exhibit Q. As stated above, all mining and reclamation will occur in an Easterly direction. 10) Prior to any mining operations, the sediment control system will be installed, which consists of a 30 foot high berm made of overburden on the South side of the property. This berm will isolate runoff water on and off the site. A 7 foot high overburden berm will be placed on the east side of the permit area for the same purpose. The berms will also contain the runoff from the 100 year/24 hour event within the permit area. If a 100 year flood occurs, the berms should isolate the permit area from the rest of the flood plain. All of the sheet flow will be directed to a central location (which from this point will be known as the discharge point). According to Colorado Department of Public Health and Environment Process water monitoring requirement will be complied with. The following is CDPHE general requirements, however, based on the location there will be site specific requirement which will be complied with. Prior to discharge all sheet flow will enter a setting/storage pond (Shown on Exhibit C). The above categories are subject to 40 CFR Part 436 Subparts B (Crushed Stone), and C (Construction Sand and Gravel). These limitations also apply to all other industrial facilities covered under SIC Code 14 (that are not covered below). The following limitations apply as outlined in these subparts. Parameter Limitations Rationale Monitoring Sample Type Frequencyi 30-Day Avg. 7-Day Avg. Daily Max. General Permit Requirement Flow, MGD Report NA Report Discharge Continuous / Recorder / In- Evaluation Instantaneousz situ z PH, s.u. N/A NA 6.5-9.0 Water Quality Weekly Grab Standards Oil and Grease, mg/l N/A NA 10 State Effluent Weekly Visual 3 Regulations Total Suspended Solids, 30 45 NA State Effluent Weekly Grab 11 19/1 Regulations Site Specific Limitation Total Dissolved Solids, Report NA Report Salinity Quarterly a Grab mg/i . Regulations Total Phosphorus (as Report NA Various Control Monthly Grab P), mg/1 ** Regulations Other Pollutants of Various NA Various Water Quality Weekly Grab Concern Standards Whole Effluent Stat Diff and IC25 > IWC State Permit Quarterly 3 Grab/Test Toxicity (WET) LC50 > 100% Limitations Quarterly Grab Chronic Acute