Laserfiche WebLink
ter Liuaury t.ontro[ Utvsston nos performed art assessment o <br />potential water quality standards based permit limitations and made a preliminary determination of applicabl. <br />limitations. This assessment was for this faciliry can be found in Appendix A. which shows the assimilaliv <br />capacities jar metals and other parameters determined to 6e of concern to this permit. These assimilative capaci`'- <br />are potential effluent limitations. Table Y-1 in this rationale display effluent Iimitctions 6osedon this water qti. <br />assessment that the Division have determined need to be imposed. <br />• pH: This pm•ameter is directly limited equal to the Water Quality Standards. <br />Matalc: Previous monitoring data for outfall 00! (Table IY-I) show that the permittee can meet the limitations jo <br />total recoverable arsenic and mercury, potentially dissolved cadmium, trivafent chromium, hexaralent chromiun <br />copper, lead, nickel, selenium, silver and zinc immediately. <br />d. Antidagtt~an -Pursuant to section 31.8(3)(c) of Thv Rncir Ctnndards and N/arFndnlnoivc for Sr rfnrv Water a <br />antidegrgdation review is required for this permitt(ng action. !n accordance with section 31.8(3}(c) in cases whet <br />the ratio of the stream flow to the effluent flow is 100: / or greater, the discharge is not etpected to cause significm <br />degradntion and no conditions related to antidegrndation will be included in the permit. <br />e. Cnlini avrdatinnc' In compliance with section 61.8(2)(1)) ojthe C'nlnrndn DtcrFr~v Parmit ~r tam Rvm latinn <br />(5 CCR 1002-61), the permittee shn[i monitor for total dissolved solids on a quarterly boars. Samples shall be taker <br />at all effluent drscharge points. Salinity requirements are included in Part I.B. I. e. ojthe permit. <br />f. Whale F uvrLTn[irity (WF.T1 Tectinv For this faciliry, acute FYET tesdng is required for outfali QOl. (See Pa, <br />LA.4. of the permit.) <br />1) Pernnw WFT Tacting: The Water Quality Control Division has established the use of WET testing as <br />method for identifying and canhalling toxic discharges from wastewater treatment facilities. WET testing <br />being utilized as a means to ensure that there are no dscharges ojpollutancs "in amounts, concentrations t <br />combiaalions which are harmful to the beneficial uses or toxic to humans, animals, plants, or aquatic life" c <br />, required by Section 31.11 (1) of the Bnsir Clnndnrr(s and MethndnlnplP~Ior Sr nrv Wnte, , <br />• 2) I rr Wn r ('nn antrntian /!WC'): Gf?tere monitoring or limitations for WET are deemed appropriate f <br />the Qivision, chronic instream dilution as represented by the chronic IWC is critical in determining whetha <br />acute or chronic conditions shall apply. For those discharges where the chronic IWC is greater than (>) 9.1: <br />chronic conditions apply; where the IWC is less than or equal to 9.1% acute conditions apply. The chron <br />IWC is determined using the following equation: <br />IWC = (Facility Flow (FF)/(Stream Low Flow (anneral) + FF)J X ! 00°/ <br />Theflosvs and correspandinglWCforthe apprapriatedischarge point are: <br />Discharge Point Chronic Low Flow,30E3,(ejs) FaciliryDesignFlow,(cfs) IWC,(%) <br />00! 1138 I.54i 0.l36 <br />The IWC for this permit is 0.13b%, which represents a wastewater concentration of 0.136 °o effluent <br />99.864% receiving stream. <br />3} Arista WFT f imit trt inn<: Given the history of the land use and the areas of contamination, the Division belieti' <br />there is reasonable potential for the discharge to interfere with attainment of applicable water quah <br />classifications or standards. Because ojthis condition, the acute roxiciry limit has been incorporated into r. <br />permit and becomes effective immediately. The permittee is required to conduct routine monitoring, the rezu <br />ojwhich are to be reported as an LC;n If the LC;o > /00% effluent, the permittee is required to conduct t. <br />automatic compliance schedule as identifed in Pmt (.B. of the permit. <br />• 4) ('onvrnL_[pjnrmnAnn: The permittee should read the WET testing sections under Parts (.k.4. of the p_. ;. <br />cm~efirtty. The permit outlines the test requirements and the required follow-up actions the pennittee mtat to <br />to resolve a toxicity incident The permittee should read, along with the documenu Ivted in Parer LA.4.a. of t <br />pel'Aal, ~lt.° rnlnrnlla Wntar n!rn!iN (Tntrnl tti~~ifinn Rimm~nilnrino r:u idn nra r)nnrrnan~ <br />dared July 1, 19i <br />