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Section D: PLANT OPBxATIONS <br />Page 31 <br />EFFLUENT FECAL COLIFORM PRETREATMENT STRUCTURE <br />CONCENTRATIONS MODIFICATIONS <br />Three problems in the pretreatment process war- <br />rant investigation and action over the next few <br />years. The failure of the protective coatings in the <br />process basins will require a recoating of the con- <br />crete surfaces with a more reliable. and durable <br />material. The accumulation of excessive rocks and <br />grit in the bottoms of the screw pumps and the raw <br />sewage wet well may require installing rock traps <br />and additional grit removal equipment. Finally, <br />the unsatisfactoryperformance of the comminutors <br />in reducing the size of plastics and rags will require <br />further investigation of viable alternatives, such as <br />mechanical bar screens or better shredders. <br />ODOR CONTROL PROGRAM <br />Installing additional odor control equipment and <br />improving the existing equipment and practices <br />will continue to be a top priority for Operations <br />staff: The odor systems on two of the primary <br />clarifiers have proven effective, and systems may <br />be installed on the remaining two clarifiers. Simi- <br />lar systems are planned for all points throughout <br />the plant where turbulent conditions are likely to <br />produce odors. <br />The maximum allowable monthly average of <br />effluent fecal coliform (FC) concentrations in the <br />waste discharge limitation permit is 200 colonies <br />per 100 milliliters. The maximum weekly average <br />allowed is 400 colonies/100 milliliters. <br />