HYDRO28507 - Laserfiche WebLink

Home Browse Search

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT. Water Quality Control Di vision Rationale -Page 11, Permit No. CO.0032115 S) Genera! !n(ormarion: The permirree should read the WET testing sections oJParr /.A.2. oJ'rhe permit carefully. The permit outlines the test requirements and the required follow-up actions the oermltree must take ro resolve a toxicity incidem. The permitree should read, along with the documents listed in Parr 1.A.2. (a) of the permit, the Colorado Water Oualirv Control Division Biomanitaring Guidance Document, dated July 1, 1993. This document outlines the criteria used by the Division in such areas as granting reli;~` from WET testing, modifying test methods and changing rest species. The permittee siioulcl be aware that some of the conditions outlined above may be subject to change if the facility experiences v change in discharge, as outlined in Part I/.A. / of the permit. Such changes shell be reported « ~ the Division immediately. 6) Outfalls 003. 006. 008, 010. 012 and 014: these outjalls consist surface runoff Bey cruse these six outjalls consist ojsurface runoff only and discharge during periods of hfgh stream Jlow, they are not believed to contribute toxicity. On this basis, WET resting is not a requirement for these ourJalls. However, the Division reserves the right ro reopen the permit to include WET resting, should facility conditions change w ijnew information becomes available. 4. Stormwater Evaluation: Stormwater from active and inactive coal mining sires that has been contaminated by contact with overburden, raw material, intermediate products, byproducts, finished products or ~susre products located at the site is required ro be covered by a Colorado Discharge Permit System (COPS) permit in order to 6e discharged to Waters of the State. This coverage may be obtained under either a COPS lndustrinl Wastewater Discharge Permit or a COPS Stormwater Discharge Permit. The Division understands that all discharges of stormwater pass through outjalls covered urufer permit CO-0032115. Any discharges that consist only of stormwater that have become contaminated as described above, that do nor discharge through the outjalls for permit number CO-0032115 must be covered by a Stormwater Discharge Permit. Starmwater permitting issues for this facility will be handled separately by the Division's Srormwater Unir, although this permit may be reopened at a later date to incorporate srormwater provisions. if deemed appropriate. S. Economic Reasonableness Evaluation: Section 25-8-503(8) of the revised (lone 1985) Colorado Water Ouality Control Act required the Division ro 'determine whether or not any or al! of the water quality standard based eJjiuent limitations are reasonably related to the economic, environmental, public health and energy impacts to the public and affected persons, and are in furtherance of the policies set jonh in sections 25-8-/92 and 25-8-104.' The Regulations for the Stare Discharge Permit System, 6.I.0, further define this requirement under 6.12.0 and state.• "Where economic, environmental, public health and energy impacts to the public and affected persons have been considered in the classifications and standards setting process, permits written to meet the standards may be presumed to have taken into consideration economic factors unless: a) Anew permit is issued where the discharge was not in existence at the time of the classification and standards rulemaking, or bl !n the case of a contiwing dischargt, additional information or factors have emerged that were not anticipated or considered at the time ojrhe classification and standards rulemaking.' The evaluation for this permit shows that the Water Quality Control Commission, during their proceedings to adap~ the Classification and Numeric Standards for the Arkansas River Basin, considered economic reasonableness. Furthermore, this is rsot a new discharger and no new information has been presented regarding the classifications and standards. therefore, the water quality standard-based efJiuent limitations of this permit are determined to be reasonably related to the economic, environmental, public health and energy impacts ro the public and affected persons and are in furtherance of the policies set forth in Sections 25-8-102 and 104. /j use permirree disagrees w:.' this finding, pursuant to 6./2.0(2)(6) the permittee should submit all pertinent information to the Division during the public notice period. B. Monitoring 1. E(iluent Monitoring: Effluent monitoring will be required as shown in Tables VI-6 through VI-8, Refer to the permit for locations ojmonitoring points. Sample type for pH has changed from "Grab" to "Irs-Situ" to reflect rhr need !o analyze soon after sample collection, er dictated by the approved methodology. .9na1)¢ing several hours ,-- days after sample collection often yields unreliable results.