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Rationale, Page 6. This document outlines the criteria used 6y the Division in such areas as granting relief from WET testing modifying test methods and changing rest species. The permittee should 6e aware that some of the condition outlined above may be subject to change if [he facility experiences a change in discharge, as outlined in Pm O.A.1. ojthe permit. Such chnnges shall be reported to the Division immediately. 3. Ctnrrnwnter Fvnluntinn Stornnvater from sand and gravel facilities is required to be covered by a Colorado Dischnrge Permit System (CDPS) permit in order to be discharged to Waters of the State. However, it is the Division's understanding that all stormwater runoff from Fruity bfarketing and Management's facility is discharged to the sedimentation pond, ~t~here it will commingle with the process water. !J there is no discharge of stormtivaler to Waters ojthe State, then a stormwater discharge permit is not necessary. Ij conditions at the site change such that a stormwater discharge Wray occur, then stormwater discharge coverage must be applied for. Ifneeded, the Division's stormwater Program will handle stormwater-permitting issues for this facility separately, although this permit may bereopened later to incorporate stormwater provisions, if deemed appropriate. 4. Frnnnmir Rvacnnnhlanacs FvrtTrrnrinn: Section 25-8-503t8J of the revised (June /985J Cnlnrndn Girnror rnli (-nnrr dct required the Division to "determine whether or not any or all ojthe water quality standard based effluent limitatim are reasonably related to the econoric, environmental, public health and energy impacts to the public and affere persons, and are in fw-therance ojthe policies set forth in sections ZS-8-f9Z and 15-8-104." The Colorado Discharge Permit System Regulations, Regulation No. 61, further define this requirement under 61.11 ar state: "Where economic, environmental, public health and energy impacts to the public and affected persons have beF considered in the classifications and standards setting process, permits written to meet the standards may be presume to have taken into consideration economic factors unless: aJ Anew permit is issued where the discharge was not in ecisrence at the time of the classifccation and startdar rulemaking, or ~ bJ /n the case oja continuing discharge, additional information ar factors have emerged that were not anticipated considered at [he time of the classification and standards ru[emaking." The evaluation for this permtt shows that this is a new facility not in ecistence at the h'me of water quality stnndar rulemaking. However, based on available data, the resulting water quality standard-based effluent limitations c determined to be reasonably related to the economic, environmental, public health, and energy impacts to the public c affected persons. Ij the permiaee disagrees with this finding, pursuant to 6l.I l(bJ the permittee should submu pertinent information to the Division during the public notice period. B. Monitoring Fffluvnr Mnnirnrinv -Effluent monimring will be required as shown in Table V-1. Refer to the permit for location. monitoring points. Table V-2 - ManitorinR Requirements Parameter Monitorin~Frequenry SamDleType Flow, MGD Weekly Instantaneous Tota[ Suspended Solids, mg/L Weekly Grab Oil and Grease, mg/L Weekly Yisttal' pH, s.u. Weekly In-Situ Total Recoverable Arsenic, mg/L Monthly Grab Potentially Dtssolved Cadmium, mg/L Monthly Grab Potentially Dissolved Trivalent Chromium, mg/L Monthly Grab Potentially DissolvedHesrvalentChrnmium,mg/L Monthly Grab • Potentially Dissolved Capper, mglL Monthly Grab Potentially Dissolved Lend, ntg/L Monthly Grnb Total Recoverable Mercury, mg/L Monthly Grab