Laserfiche WebLink
WASTE DISCHARGE REQUIREMENTS -3- <br /> MARLEY COOLING TOWER COMPANY <br /> SAN JOAQUIN COUNTY <br /> Ground Water (mg/1 ) <br /> Constituent Storm Water (mg/1 ) Existing Plant Interim Plant <br /> Total Chromium 1.00-8.00 0.75-1.50 16-22 <br /> Chromium VI 0.75-7.50 0.70-1.50 14-20 <br /> Copper 0.50-8.00 0.008 0.001-0.010 <br /> Arsenic 0.05-0.20 <0.01 <0.1 <br /> Total Dissolved <br /> Solids (TDS) 450-550 500-650 <br /> Electrical <br /> Conductivity (EC) <br /> (umhos/cm) 450-650 550-800 <br /> 11. Bench tests have indicated that the electrochemical process is effective in <br /> reducing high concentrations of chromium to concentrations below those <br /> necessary to discharge to the Stockton Diverting Canal , provided there is <br /> filtration of the effluent. This process produced a finished water that <br /> was below 50 ug/l of total chromium in all but one test while the <br /> hexavalent chromium was never substantially above 11 ug/l . The bench tests <br /> also indicated that the TDS concentrations of the electrochemically treated <br /> waters should be the same as the influent or lower. <br /> 12. This new plant is an interim expansion. Additional treatment capacity may <br /> be required at a future date. <br /> 13. 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 /> 14. 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 interim <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 /> 15. 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 />