Item A - PH on MWMC/Metro Plan - Laserfiche WebLink

Home Browse Search

File N~mber:. 55999 Page 10 of 26 Pages NOTES: ' - . 1. E: .ocli monitoring must be conducted accord!nE tO any 9fthe'following te~ procedures as specified in Standard'Methods for the Examination of Water and Wastewater, 19th Edition, or according to any test procedure that has been authorized and approved in writing by the Director or his authorized representative: mTEC agar, MF ' Standard Methods, 19th Edition 9-28 9213 D NA-MUG, MF Standard Methods, 19th Edition 9-63 9222 G Chromogenic Substrate, MPN Standard Methods, 19th Edition 9-65 9223 B Colilert QT Idexx Laboratories, Inc. ' 2. Beginning no later than July 1 2002, the permittee shall conduct bioassay testing for a period of one (1) year. in accord.~ce with the frequency specified above. If the bioassay tests show that the effluent, sarriples are not acutely toxic at the. dilution determined to occur at the Zone of Immediate Dilution and chronically toxic .:. at.the Mix'rog Zone, no further bioassay testing w~ll be.required during this permit cycle..Bioassay results required w. iththe next NPDES permit renewal application are as follows: At a minimum, quarterly testing for a..12-m..onth period within the past one: Year, .or the results fi-om four tests performed at:least annually in the four and one half years prior to the application, using the spedes.listed in Schedule D, · . 3. For influent and effluent cyanide sampleS, at least six (6)discrete gra. b samples shall be collected over the ..- 0perating. day. Each.aliquot shall be not. less than 100 ml and shall be collected and. composited into a larger container.wfiich has been preserved with sodium hyck. oxide fo.r cyanide samples to protect sample .integrity. 4. The pe..rmittee shall perform chemical .analysis. of its influerit, effluent and biosolids to be beneficially used for the. to .m;' c organic pollutants listed in Tables II ofAppendix D of 40 CFR Part'122 in accordance ~ith the · . sampling, frequeney in Schedule B. The influent and effluent samples shall be 24-hour dally composites, except where sampling volatile comlJounds. In this ease, six (6) discrete samples (not less than 100 nfl) coll.ect.ed, over the operating day are acceptable. The permittee shall take special precautions in compositing the. '.m,d~v~d. ual..grab samples for the volatile organics to insure sample integrity (i.e.n.o exposure to the outsme air), .A!temately, the discrete samples collected for volatiles'may be analyzed separately and averaged. :For biosolids analyses, a grab s~nple fi-om the sludge holding tank overflow shall be used. The results o.fthe Priority Pollutant Scan analysis s.hall be submitted with'the annual pretreatment report.. 5. Daily 24-hour composite samples'shall be analyzed and reported separately. Toxic monitoring results and' toxics removal efficiency calculations shall be tabulated and submitted with the Pretreatment Program Annual Keport as required in Schedule E. Submittal of toxic.monitoring results with the monthly Discharge Monitoring Keport is not required. .. 6. Composite samples fi;om the sludge lagoons shall consist of blending equal volumes of grab Samples taken fi.om the center of 9 or more like-size units resulting fi-om an imaginary grid placed over each lagoon. The grab samples shall include the entire depth of sludge in the area sampled. Composite samples from the air drying beds shall consist of blending equal volumes of grab samples taken 'from each air drying bed in use. Samples shall be representative of the sludge being land applied. Inorganic poll .utant monitoring must be conducted according to Test Methods for Evaiuatine Solid Waste. Physical/Chemical Methods, Second Edition (1982) with Updates I and II and third Edition (1986) with Revision I. Fecal Coliform monitoring must be conducted according to Fecal Col~orm, Part 9221 E. or part 9222D., "standard Methods for the Examination of Water and Wastewater", 18~ Edition, 1992, American public Health Association, 1015 15~ Street, NW., Washington, DC 20005. 7. Calculation of the % volatile solids reduction for the anaerobic digesters is to be based on comparison cfa representative grab sample of total and volatile solids entering the digestion process and a representative composite sample of sludge solids exiting the sludge holding tanks. 8. The days of digestion shall be calculated by dividing the digester liquid volume by the average daily volume of sludge production. 4-34