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0 <br /> WASTE DISCHARGE REQUIREMENTS -4- <br /> MARLEY COOLING TOWER COMPANY <br /> SAN JOAQUIN COUNTY <br /> Constituent Storm Water (mg/1 )* Ground Water (mq/1 )* <br /> Total Chromium 1.00-8.00 16-22 <br /> Chromium VI 0.75-7.50 14-20 <br /> Copper 0.50-8.00 0.001-0.010 <br /> Arsenic 0.05-0.20 <0.1 <br /> Total Dissolved <br /> Solids (TDS) 500-650 <br /> * For more detailed influent characteristics, see Attachment C, incorporated <br /> herein and made part of this Order. <br /> 15. The Discharger discharges to the Stockton Diverting Canal . From 1 October <br /> to 1 April , all flow in the Calaveras River is diverted at Bellota to Upper <br /> Mormon Slough, tributary to the Stockton Diverting Canal , tributary to the <br /> Calaveras River (see attachment C) . No flows are maintained in the <br /> Calaveras River channel between the fork with Upper Mormon Slough and the <br /> confluence with the Stockton Diverting Canal . <br /> 16. From 1 April to 1 October, flows are maintained in both the Calaveras <br /> River, as well as Upper Mormon Slough and the Stockton Diverting Canal . <br /> Numerous check dams to retain flows for irrigation supply are placed along <br /> Upper Mormon Slough, the Stockton Diverting Canal , and the Calaveras River <br /> from Upper Mormon Slough to the Stockton Diverting Canal . The discharge <br /> will mostly be used for irrigation during this period of the year. <br /> 17. The Discharger submitted a Technical Report, dated 16 December 1988, <br /> required by Provision 6 of Order No. 88-124. The Technical Report, <br /> entitled "Effluent Toxicity Program Report," summarized effluent toxicity <br /> testing results. <br /> 18. The results in the Effluent Toxicity Program Report demonstrates that the <br /> Discharger's effluent does not have a reasonable potential to cause fathead <br /> minnow (Pimephales promelas) instream toxicity. More extensive monthly <br /> acute toxicity testing confirms this finding. However, the proposed <br /> expansion will result in slightly different effluent characteristics. <br /> Quarterly testing of fathead minnows is warranted to demonstrate that the <br /> effluent from the plant expansion continues to show no instream toxicity. <br /> 19. The results in the Effluent Toxicity Program Report also indicated that the <br /> effluent may periodically cause acute invertebrate (Ceriodaphnia dubia) <br /> instream toxicity. More extensive invertebrate follow-up toxicity testing <br /> is needed to confirm this potential acute toxicity. If the follow-up <br /> testing indicates that there is instream toxicity of the effluent, the <br /> Discharger needs to conduct a Toxicity Reduction Evaluation to determine <br /> the cause and develop a corrective action plan. <br /> 20. The Discharger has had repeated violations of Effluent Limitation 1 in <br /> Order No. 88-124 for chromium, copper and TDS. The Discharger was notified <br /> of the violations by letter dated 30 September 1991. Operational changes <br />