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<br />17 Jan zooz <br />n4 r. Chris cater <br />Colorado DepatYment of Health - <br />Pu(r~mitsand Enforcement Section <br />Western Fuels-Colorado ~~/Q(-D PH-62 <br />F.lJ. box 628 4300 Cherry Creek Drive South <br />Nuda, Colorado Bw24 Dcnvcr, CO 50222-IS30 <br />Telephone 970/864~2I69 <br />faz 97o/86d-2168 <br />• <br />• <br />Water Quality Control Division <br />Rf_: Permit Modification Request to NPDGS Permit No: CO-000021; <br />Dear Mr. Gates: <br />Based on conversations with people knowledgeable in the field of Whole Gffluent Toxicity (WET) testing, <br />Western Fuels Colorado (W FC) requests a permit modification on our WGT test requirements due to the <br />persistent high TDS values in our outfall waters. WFC would like to use Dauphnia ma,na instead ofthe <br />curren0y mandated Ceriodauphnia dubia for relevant portion of our WET test. This modification would <br />apply to all of our owfalls, current and future. Table I below shows our monthly TDS values for the <br />NPDES 007 outfall for [he past Lvo years and the NPDES OOS outfall for the past hvo months (from the <br />start ofsteady discharge). The report sheets from the analytical lab are attached at Appendix A. Our only <br />other active outfall, NPDES 001 is awaiting release from [he NPDES regulations as per my letter of 14 <br />Nov 01 to you (attached for reference). <br />fable I: "I'DS Values Ibr NPDES 007 and NPDES 008 for Selected Intervals <br />NPDES 007 NPDES OOS <br />Date TDS (mg/L) Dale TDS (mg/L) Date TDS (n,g/L) <br />.Ian 00 2820 Jan O I No Discharge Jan O I No Discharge <br />Feb 00 2900 Feb Ol No Discharge Feb Ol No Discharge <br />Mar 00 No Discharge Mar OI No Discharge Mar OI No Discharge <br />Apr 00 No Discharge Apr OI No Discharge Apr OI No Discharge <br />May 00 1770 May OI 370 May 01 No Discl,argc <br />.lun 00 2360 Jun OI 1910 Jun OI No Discharge <br />Iu100 2690 1ul OI 2650 Jul 01 No Discharge <br />Aug, 00 2600 Aug OI 2590 Aug OI No Discharge <br />i tirp (10 ~2R(1 Sep 01 2C> 10 Sep 01 No Discharge <br />Od (10 2540 Oct OI 4490 Oct O I No Discharge <br />Nnv (1(1 2820 Nov OI 4460 Nov O I 4370 <br />Ucc O(9 2990 Dec O I 4230 Dec 01 4030 <br />Please Ict me if you have any questions. <br />Sincerely, <br />~Q~n_ <br />Tony ~dki s <br />Mine n sneer <br />f.\Itn,_IUlia\Word\watcrlNPDGS_nuid_W8T Icst_dauphnia.doc <br />