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Key Way Sewer IA DNR NPDES D~~~E ~ck~ MEMORANDUM January 9, 2006 TO: The Honorable Mayor and City Council Members FROM: Michael C" Van Milligen, City Manager SUBJECT: NPDES Permit #3126001 City Engineer Gus Psihoyos has provided the attached letter to Iowa Department of Natural Resources Environmental Specialist Mike Wade about the problems with the Key Way Sanitary Sewer. (il) ~~(}djL-- Mich"ael C. Van Milligen MCVM/jh Attachment cc: Barry Lindahl, Corporation Counsel Cindy Steinhauser, Assistant City Manager Gus Psi hoyos, City Engineer Jonathon Brown, Water Pollution Control Plant Manager Don Vogt, Public Works Director THE CITY OF ~ DUB E ~YN-~ MEMORANDUM January 9, 2006 TO: Michael C. Van Milligen, City Manager Gus Psi hoyos, City Engineer . yQ SUBJECT: City of Dubuque Wastewater Collection System Inspection NPDES Permit #: 3126001 FROM: INTRODUCTION The purpose of this memorandum is to present the City's response to the inspection of the City's wastewater collection system performed by the Iowa Department of Natural Resources (IDNR). DEFINITIONS Bvpass: When domestic wastewater is not collected and transported to a wastewater treatment facility. In Dubuque, it typically occurs when the flow of water (a combination of domestic wastewater and rain) exceeds the capacity of the sanitary sewer. Flow: Quantity of water flowing in a sewer system. 1L!: Short for infiltration and inflow, it is rain and groundwater that gets into the sanitary sewer system. NPDES Permit: A permit issued by the IDNR that allows the discharge of treated wastewater or stormwater into waters of the United States such as the Mississippi River. BACKGROUND NPDES Permit #3126001 allows the City of Dubuque to discharge treated wastewater into the Mississippi River. The permit addresses the sanitary sewer collection and wastewater treatment system. On October 18, 2005, the IDNR performed a routine compliance inspection of the wastewater treatment collection system. The City received the results of the inspection on December 16, 2005 in a letter addressed to the Honorable Mayor and City Council. Problems with the North Fork Catfish Creek sewer system force the City to occasionally pump wastewater into the North Fork Catfish Creek at Keyway during heavy rains. The pumping is done to prevent the wastewater from backing up into homes, a significant health risk. . . For over a decade, the City of Dubuque has been proactively seeking out and eliminating sources of 1&1 throughout the City. The goal has been, and continues to be, the end of wet-weather bypasses. Committed to 1&1 reduction, funds are allocated each year in the Capital Improvement Program Budget its the 1&1 Reduction Program. Efforts include: . Home/building inspections to check for illegal connections to the sewer system; . Permanent and temporary flow monitoring; . Smoke and dye testing to identify defects and cross-connections; . Systematic inspection and replacement of brick manholes; . Routinely televising sewers to identify defects; . Sewer flushing and cleaning as necessary; and . Reconstruction and rehabilitation (lining) of deficient sewers. Even though we recognize that our efforts have not solved the bypass problem, we are encouraged that a bypass has not occurred at Keyway in the past 18 months. DISCUSSION The IDNR inspection report required that the City "submit a report of an evaluation as to whether the problem with the Key Way sanitary sewer system can be corrected by 1/1 reduction alone." And if III reduction alone cannot solve the problem, "then the City must submit a plan of action for increasing the capacity of the sewer system." Fulfilling those requirements, the City's response was prepared and submitted to the IDNR (see attachment). Attachments Prepared by Deron Muehring & Todd Irwin CC: Cindy Steinhauser, Assistant City Manager Ken TeKippe, Finance Director Jonathan Brown, Water Pollution Control Manager Don Vogt, Public Works Director John Klosterman, Street & Sewer Maintenance Manager Deron Muehring, Civil Engineer II Todd Irwin, Engineering Assistant II D~~~E ~~~ City of Dubuque Engineering 50. W. 13th Street Dubuque, IA 52001 (563) 589-4270 January 9, 2006 Mike Wade Environmental Specialist Iowa Department of Natural Resources Field Office #1 909 West Main Suite 4 Manchester, IA 502057 RE: 12-15-05 City of Dubuque Wastewater Collection System Inspection Report (NPDES Permit #:3126001) Dear Mr. Wade: Thank you for recognizing the City's efforts to identify and eliminate sources of 1&1 in the inspection report. For over a decade, the City of Dubuque has been proactively seeking out and eliminating sources of 1&1. Efforts include: . Home/building inspections to check for illegal connections to the sewer system; . Permanent and temporary flow monitoring; . Smoke and dye testing to identify defects and cross-connections; . Systematic inspection and replacement of brick manholes; . Routinely televising sewers to identify defects; . Sewer flushing and cleaning as necessary; and . Reconstruction and rehabilitation (lining) of deficient sewers. The goal has been, and continues to be, the end of wet-weather bypasses. The City of Dubuque remains committed to 1&1 reduction and allocates funds each year for its 1&1 Reduction Program. And even though we recognize that our efforts have not solved the bypass problem, we are encouraged that a bypass has not occurred at Keyway in the past 18 months. This letter is in response to the specific requirement outlined in your inspection report: Within 30 days, the City must submit a report of an evaluation as to whether the problem with the Key Way sanitary sewer system can be corrected by III reduction alone. If it cannot, then the City must submit a plan of action for increasing the capacity of the sanitary sewer system upstream of the Key Way location. . In March of 2004, the City funded an evaluation of the sewer that the inspection report refers to as the "Key Way sanitary sewer system." Enclosed is the Final Report of the North Fork Catfish Creek Sanitary Trunk Sewer Study (April 2005), prepared by Veenstra & Kimm, Inc. The study concluded that "I & I removal alone will not solve the problems (bypass) occurring in the sewer" (Section 4.1). It recommended replacing the existing 12-inch diameter clay sewer with a 24-inch diameter ductile iron sewer from University Avenue to Keyway. It also recommended that 1&1 reduction efforts continue. Based on the recommendations of the study, City staff subsequently recommended a series of improvement projects with an estimated cost of just under $2,000,000 to upsize the Catfish Creek interceptor sewer line from US20 to the NW Arterial. The projects are: 1. Section 1 - University Avenue to Kensington Place (12" to 24"); 2. Section 2 - Kensington Place to North of Pennsylvania Ave. (12" to 24"); 3. Section 3 - North of Pennsylvania Ave. to Keyway (12" to 24"); and 4. Section 4 - Keyway to the NW Arterial (12" to 18"). Sections 1,2, and 3 are now in the adopted Fiscal Year 2006-2010 Five Year Capital Improvement Program Budget (see attachment). Section 4 is in the recommended Fiscal Year 2007-2011 Five Year Capital Improvement Program Budget, which will be considered by the City Council next month. The four improvement projects will: reduce the inflow into the interceptor sewer pipe; result in a sewer that will have the capacity to handle current and future flows (both dry and wet weather); end bypasses at Keyway; and allow the City to expand its 1&1 reduction efforts to other areas. Finally, as recommended in your inspection report, the Reeder Street Sanitary Sewer & Storm Sewer Reconstruction Project has moved into the preliminary design stage. Funds for the project were previously approved and the project should be completed this coming construction season. We believe that this letter, along with the enclosed Final Report of the North Fork Catfish Creek Sanitary Trunk Sewer Study, fulfills the requirements of the City of Dubuque Wastewater Collection System Inspection Report dated December 15, 2005. If you have any questions or need further information please contact our office at 563- 589-4270. SinC~r~IYr~ . 5t~~." . ~~'r~ Gus Psihoyos, P.E. City Engineer Cc: Jonathan Brown, Water Pollution Control Manager Don Vogt, Public Works Director , . STATE OF IOWA THOMAS J. VILSACK, GOVERNOR, SALLY J. PEDERSON, LT. GOVERNOR DEPARTMENT OF NATURAL RESOURCES JEFFREY R VONK, DIRECTOR CERTIFIED MAIL December 15, 2005 City of Dubuque 50W, 13'hSt. Dubuque, IA 52001 ATTN: Honorable Mayor & City Council RE: City of Dubuque Wastewater Collection System Inspection NPDES Permit #: 3126001 Dear Honorable Mayor & City Council: Enclosed is the report of the recent inspection of the above facility conducted by Sue Miller of the Field Office #1 staff. We believe you will find the report self-explanatory and strongly encourage you to take action on all the requirements listed at the end of the report, We are especially concerned about the capacity of the sanitary sewer collection system upstream of the Key Way area. Within 30 days, the City must submit a report of an evaluation as to whether the problem with the Key Way sanitary sewer system can be corrected by III reduction alone, If it cannot, then the City must submit a plan of action for increasing the capacity of the sanitary sewer system upstream of the Key Way location, If you have any questions about the inspection or report, please contact Sue Miller or myself at this office, Sincerely, !Yl~ LJcA Mike Wade Environmental Specialist cc: Courtney Cswercko, IDNR Wastewater See, (wlencl.) Michael Van Milligan, City Manager, City of Dubuque (w/encl.) Jon Brown, City of Dubuque Wastewater Supt. (wlencl.) John Klosterman, City of Dubuque Public Works Supt. (wlencl.) FIELD OFFICE #1 / 909 West Main Suite 4 / Manchester, IA 502057 563-927-2640 I FAX 563-927-2075 IOWA DEPARTMENT OF NATURAL RESOURCES WASTEWATER TREATMENT COLLECTION SYSTEM INSPECTION NPDES Permit #.: 3126001 FACILITY RESPONSIBLE OPERATOR DESIGN CAPACITY NOW TREATING RECEIVING STREAM GENERAL DESCRIPTION: INSPECTION PERSONS INTERVIEWED INSPECTOR: REVIEWER: Pa e 1 of 4 FACILITY INFORMATION PLANT GRADE: IV CITY: Dubu ue GRADE: IV STATE: Iowa ZIP: PHONE: 52001 563/589- CERTIFICATION NUMBER: 1671 AVERAGE MGD: 17.32 AVERAGE MGD: MAXIMUM MGD: 23.24 MAXIMUM MGD POUNDS BOD/DAY: 24400 POUNDS CBOD/DAY: PE (BOD): 146108 PE (BOD): PERIOD REVIEWED: 1/1/02-1010/05 Mississippi River A, B(WW) POPULATION SERVED: 52,895 Activated sludge INspectJONINI'(j)a'l';II~tl(j)N DATE THIS INSPECTION: DATE lAST INSPECTION: 10/18105 OS/20/02 NAME: Jon Brown John Klosterman PURPOSE: Routine Com TITLE: Wastewater Superintendent Public Works Superintendent * Explain in Comments and Recommendations Section DATE: /;J /5 os: DATE: J.) -} ~ -0" Dubuque Wastewater Collection System Inspection NPDES Permit #: 3126001 Inspection Date: 10/18/05 Page 2 FACILITY EVALUATION: COLLECTION SYSTEM Operation & MaintenanCe - All combined sewer overflows have been eliminated except one, which is located on Reeder Street. (See map.) Physical Condition - The City televises the sanitary sewers during all new and reconstruction street projects. Problem areas are identified in a written maintenance plan. Reeder SI. Storm/sanitary sewer - Mr. Klosterman made us aware that there is a potential for a sanitary to crossover to storm water discharge in a sewer located along Reeder Street near Mercy Hospital. The sewer pipe is divided, carrying storm water on one side and sanitary waste on the other. The potential exists for sanitary waste to enter the storm water side in a manhole If this happens it would be considered an illegal discharge. Infiltration/Inflow - 1/1 continues to be a problem in the Key Way area. The City has done flow monitoring and door-to-door inspections for illegal connections in this part of town, but the problem remains. The result is that the line that serves the Key Way area and the west part of town experiences frequent bypasses during rain events. The following is a list of reported bypasses since the last compliance inspection. Date Est. Quantitv Location Cause 8/18/05 50-100 gallons W. Locust 2" rainfall and partially blocked line 4/04/05 unknown auantitv 2325 Coates & 742 Peru Rd vandalism blocked manhole 6/30104 1,000 aallons 4792 Camelot Drive blocked line 5/30/04 30,000-40,000 Key Way Drive 2" rainfall qallons 5/12/04 unknown quantitv 3212 Pennsvlvania Ave. blocked pipe 11/23/04 2,000 qallons Kev Wav Drive 3" rainfall 11/03/03 50,000-70,000 Key Way Drive 3"-4" rainfall qallons 4/30/03 (6" pump ran for 5 Key Way Drive 3"-4" rainfall hours 1/06/03 Quantity not N. Grandview and 3200 plugged line reported, 6/04/02 (6" pump ran for Key Way Drive heavy rainfall in 2 days 23.5 hours) 6/04/02 6" pump ran for 10 Key Way Drive heavy rainfall in 2 days hours Bypasses as the result of a precipitation event with an intensity or duration greater than that of a storm with a return period of two years (see Appendix A) should not occur. Rainfall data from Iowa State University indicates that the rainfall events associated with the Key Way bypasses occurred during rainfall events with intensity and duration that are more frequent than a two-year return period. Rainfall data can be accessed at the following website: http://wepp.mesonet.aaron.iastate.edu/ The City conducted a sanitary sewer study in 1999, the results of which were submitted to this office. Significant III removal was accomplished at that time. An update was submitted in 2001 that outlined more plans for III removal. A 1994 memo, from Michael Koch to Michael Van Milligan, contained in the 1999 study states that the capacity of the sanitary sewer upstream of the Kensington and Key Way area is "only 1.61 million gallons per day." There has been significant growth in the west end of the City of Dubuque since 1994. The City must evaluate whether the problem with this line can be corrected by III reduction alone. If it cannot, then the City must submit a plan of action for increasing the capacity of the sanitary sewer system upstream of the Key Way location. DUbuqtfe5Jvastewater Collection System Inspection NPDES P~rmit #: 3126001 Inspection Date: 10/18/05 Page 3 LIFT STATION(S) Operation and Maintenance- The City of Dubuque maintains the following 11 lift stations: 1. Kerper Boulevard- This lift station is located in a building in the median of Kerper Blvd. The pumps were being replaced in this lift station the day of this inspection. The two pumps are 15 hp turbines. The lift station has no high level alarm and is not connected to the SCADA system at the treatment plant. There is an overflow at this lift station identified on the NPDES permit as Outfall 005. 2. Dog Track- This lift station is located south of the US 151 bridge near the marina. The pumps and controls at this lift station are located below ground. There is an overflow at this lift station that is not listed as an outfall on the facility NPDES permit. We also noted that a water hydrant is located near the lift station. A hose connected to this hydrant was in the wet well. The lift station has no high level alarm and is not connected to the SCADA system at the treatment plant. 3. Cedar Street- This lift station contains 3-350 hp turbine, flow-variable pumps. The speed of the pumps is regulated by a liquid rheostat. Mr. Brown reported that the Cedar St. lift station is scheduled to be refurbished by next fall. The lift station has no high level alarm and is not connected to the SCADA sysb~m at the treatment plant. There is an overflow at this lift station identified on the NPDES permit as Outfall 002. 4. Terminal Street- This lift station contains 3-350 hp turbine, flow-variable pumps. The speed of the pumps is regulated by a liquid rheostat. The lift station has no high level alarm and is not connected to the SCADA system at the treatment plant. There is an overflow at this lift station identified on the NPDES permit as Outfall 003. 5. Granger Creek- This lift station serves the area south of the City including the Technology Park. Wastewater from the Granger Creek lift station. 6. Catfish Creek- This lift station pumps wastewater that is collected from the entire west end of the City from Grandview Avenue to the new industrial park on Seippel Road. Field Office records show that this lift station was rebuilt in 2000. The lift station is equipped with three, 2,500 gpm submersible pumps. There is an overflow at this lift station identified on the NPDES permit as Outfall 004. The following stations were not inspected during this visit: 7. Bradley Street- This lift station is located in a residential yard. It has no alarm, but is checked weekly by City personnel. There is an overflow at this lift station identified on the NPDES permit as Outfall 006. 8. Perry Street- This lift station is located in a residential yard. It has no alarm, but is checked weekly by City personnel. There is an overflow at this lift station identified on the NPDES permit as Outfall 007. 9. Asbury Plaza- This lift station, which is equipped with two, 215 gpm submersible pumps, was constructed in 2002. The lift station has an audio-visual alarm. 10. Arboretum Drive- This lift station, which is equipped with two, 325 gpm submersible pumps, was constructed in 2001. The lift station has an audio-visual alarm. 11. Cedar Cross Road- This lift station is located in a commercial area. The lift station has an audio- visual alarm. The City must notify the Department of ill! outfalls on any applications submitted. If there are other outfalls that exist but are not listed on the facility NPDES, the City must submit a list that includes the locations of each outfall to Courtney Cswercko, DNR Wastewater NPDES Permits Section. Dubuque Wastewater GollectionSystem Inspection NPDES Permit #: 3126001 InspectionDate: 10/18/05 PageA SUMMARY OF REQUIRMENTS 1. Within 30 days, the City must submit a report of an evaluation as to whether the problem with the Key Way sanitary sewer system can be corrected by 1/1 reduction alone. If it cannot, then the City must submit a plan of action for increasing the capacity of the sanitary sewer system upstream of the Key Way location. 2. The City must notify the Department of all outfalls on any applications submitted. If there are other outfalls that exist but are not listed on the facility NPDES, within 30 days the City must submit a list that includes the locations of each outfall to Courtney Cswercko, DNR Wastewater NPDES Permits Section, 502 E. 9th St., Des Moines, IA 50319-0034. SUMMARY OF RECOMMENDATIONS 1. The Department strongly recommends that the Reeder Street dual storm/sanitary sewer piping be eliminated to prevent the potential, for illegal discharges. \ \J ~ \~ (I,R \ " ,.l. "," " ,,' , [\ " ~ . (, ~. , c' \ .( . \-' I \f l:E iff ~. ~- ::E ....'" >Iii P 'lno IS'~ , 'i.I!lVOl "'... ;: -". \ !:!ll '- "-. \ . ~ .J.f ~c><:"'~.:." ~ ., 'v~ 06'"",- LJ\\L:'''''~ .\"...'=.~&- .~ t'i .... ~.-\...>. . '.' ..~ . J.~ 11-. '" ...:t. 11>{.% :;;;\~._'" .t;.'!:~5-;;:(~ 9'...:'}':c. ~ . .~. ""\ i>' ,.. _~. .,'..... W'. <f V' >~>~,\"'.. it! ." ~...~ ~ .. 12.. ~,,'''''''''.' ;llc,.Jv'~ '" ~ ~L' ~"';~~;"&" lS PJ"'1Shady 0... ~ ...... ,/ . v,." .~. ~. ~ ",,,. ... ,-..".' . ..,~. ,..' . 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'I ..,~ iT ./' .l(] ~J'\l "q,j ,f "'~ I!>~ 8:,,:.,,1 1'.., ~ ,';: Fairfax Ave ~ ,11,1 ;ii 1',1 (ifi Ji 'It 'l-- ...#~tf, 6$ t;j %~ '" "," 1 i ~~ f"""st < do ~ \(.~St ~~S\ Vidal It "II I\ouo~) IS p><>JQ eliSlol.[;r >C CO uo ~tj ~c Ul., >C~ ~ o Ul "~~ l) "pt-b~ <1,,.. ii "~ .l(] 'lld OJ"!-\; _\l>1<gl'. SlJl'!ltR~ .s $' ..,,.. '~ ~<j- ,$ & ~ o ~ ~ ~\ ~ ~ '[CI\dJ \'Il\ \ll ~<;fo ~ ,j.~ <fJ l5 ~ c -"l o i z ~ o ~ ~ ~ a ~ .. ~ o ~ I ", . lAC 12/3/86, 11/19/97 Environmental Protection[567] Ch 64, p.25 RAINF....LL INTENSITY - DUR....TlON - FREQUENCY CURVES ....ppendix .... O. , I""'- .... '- t-....... . , '"' . , - "- ..... "- "- , ....... " ,. ~'" .'c, .... ..~ ,. 2 ..... .... -",.. . .... " .... '- .... ..... .... ~ .... . .... " ..... .... "- .... " , .... , , 1 :0 j ~ ..'0 (Minu1es) .11i 4U .';IV 6U 2 .7 4 -j 6 Ii 10 12 (Hours) IH 24 21-' ( I~ 0 'Ou RO 60 . 0 co: ::> 0 :I: co: ... 10 Q. ... ... :I: v Z , 0 Z C8 )0 06 !:: ... z = 04 Z ... ... 0( u.. O.-! Z 0( co: 0' 08 06 .f o DUR....TION STATE OF IOWA THOMAS J. VILSACK, GOVERNOR SALLY J. PEDERSON, LT. GOVERNOR DEPARTMENT OF NATURAL RESOURCES JEFFREY R VONK, DIRECTOR CERTIFIED MAIL December 16, 2005 City of Dubuque 50 W 13'h SI. Dubuque, IA 52001 ATTENTION: Mayor and City COiJncil RE: NOTICE OF VIOLATION of NPDES Permit Limits NPDES Permit No. 5307001 After reviewing the monthly operation reports for your wastewater facility, several effluent violations were noted since January 1, 2002. Please refer to your facility NPDES permit for permit limits. The following permit violations were noted for fecal coliform in 2005: REPORTED VALUE September October 2,200 organisms/1 OOml 410organisms/100ml The following violations were noted for fecal coliform in 2004: REPORTED VALUE October 3000 organisms/1 OOml The following violations were noted for fecal coliform in 2003: REPORTED VALUE June 2400rganisms/100ml Field Office 1, 909 West Main Suite 4, Manchester, IA 52057 563/927-2640 FAX 563/927-2075 Dubuque WWTF NOV December 16. 2005 Page 2 of 4 The following violations were noted for Total Suspended Solids (TSS) in 2005: REPORTED VALUE REPORTED VALUE REPORTED VALUE 7- Day AVQ. 30-Day AVQ. 7- Day AVQ. Concentration Concentration Mass February 134 mg/I 56 mg/I 9925 #/day September 153 mg/I 47 mg/l 11790 #/day October 75 mg/I 37 mg/I NA November 242 mg/l 67 mg/I 14951 #/day The following violations were noted for Total Suspended Solids (TSS) in 2004: REPORTED VALUE REPORTED VALUE REPORTED VALUE 7- Day AVQ. 30-Day AVQ. 7- Day AVQ. Concentration Concentration Mass March 97 mg/I 40 mg/I 9741 #/day December 93 mg/I 36 mg/I NA The following concentration violations were noted for Total Suspended Solids (TSS) in 2003: REPORTED VALUE REPORTED VALUE REPORTED VALUE 7- Day AVQ. 30-Day AVQ. 7- Day AVQ. Concentration Concentration Mass April 77 mg/I 44 mg/I NA May 47 mg/I NA NA September 70 mg/I NA NA November 55 mg/I NA 8220 #/day The following concentration violations were noted for Total Suspended Solids (TSS) in 2002: REPORTED VALUE REPORTED VALUE REPORTED VALUE 7- Day AVQ. 30-Day AVQ. 7- Day AVQ. Concentration Concentration Mass January 132 mg/I 44 mg/I 7320 #/day June 126 mg/I 35 mg/I NA August 88 mg/I NA 9903 #/day Dubuque WWTF NOV December 16, 2005 Page 3 of 4 The following concentration violations were noted for 5-Day Carbonaceous Biological Oxygen Demand (CBODs) for 2005: February September November REPORTED VALUE 7- Day Avq. Concentration 44 mg/I 45 mg/I 82 mg/I REPORTED VALUE 30- Day Avq. Concentration NA NA 26 mg/I The following concentration violations were noted for CBODs for 2003: September REPORTED VALUE 7- Day Avq. Concentration 61 mg/I The following concentration violations were noted for CBODs for 2002: June REPORTED VALUE 7- Day Avq. Concentration 49 mg/I The following concentration violations were noted for Total Residual Chlorine (TRC) for 2005: April REPORTED VALUE Daily Maximum Concentration 0.45 mg/I REPORTED VALUE Daily Maximum Mass 28 #/day The following concentration violations were noted for TRC for 2004: May June REPORTED VALUE Daily Maximum Concentration 0.48 mg/I 0.48 mg/I REPORTED VALUE Daily Maximum Mass 46 #/day 28.01 #/day The following concentration violations were noted for TRC for 2003: July REPORTED VALUE Daily Maximum Concentration 0.39 mg/I REPORTED VALUE Daily Maximum Mass 29 #/day . . Dubuque WWTF NOV December 16, 2005 Page 4 of 4 The following concentration violations were noted for TRC for 2002: June REPORTED VALUE Daily Maximum Mass 32 #/day In addition to the above listed violations, annual effluent toxicity tests results were not conducted for the 12-month period ending December 31,2004. It has also been brougi:lt to our attention that the City has not submitted the total dissolved solids (TDS) and chloride tests required by our permitting section to complete the renewal of the NPDES permit for the Dubuque wastewater plant. Please submit these test results as soon as possible to Courtney Cswercko, DNR Wastewater Section, 502 E. 9th St., Des Moines, IA 50319-0034. Within 90 days, the City must submit a Plan of Action that includes a schedule for facility repair, replacement, or rehabilitation needed in order to meet the facility permit limits for fecal bacteria, total suspended solids, CBODs, and total residual chlorine. In the meantime, the City must begin a program of 5 fecal bacteria samples collected each month sampling during the disinfecting season until consistent compliance with fecal coliform permit limits can be demonstrated. The fecal limit of 200 org/100 ml will be based on a geometric mean of the 5 samples, not a 30-day average. Whenever the facility is out of compliance with the effluent fecal coliform limit, the City must notify this office immediately. This notice does not preclude the DNR from pursuing additional enforcement action regarding these or any other violations. Sincerely, ENVIRONMENTAL SERVICES DIVISION /YJ Jll\_j()-cL~ Mike Wade Environmental Specialist Senior c: Courtney Cswercko, DNR - Wastewater Section - Des Moines Jon Brown, Wastewater Superintendent, City of Dubuque Michael Van Milligan, City Manager, City of Dubuque File: WW/Dubuque eFile: 31 WW Dubuque 101605 nltr sjm L I ~ j1 L'r i I i L ~ l _; . PROGRAM, ~A '' ~ ~~ TOTAh u ;. pF,f?ARTMENr~55 ~"T, ,PROJECT n FRIGR~N©, y~~1 ~1~9~~`'~~kCO$T a- .._, . .. 1~~e r, ~~ Annual Program 2008-09 2009-10 BEYOND 2010 $ 42,425 $ $ 4,173 $ $ 46,598 $ A. EXPENDITURE ITEMS 18,273 Design & Engineering Land and R.O.W. 169,129 Construction Other 187,402 TOTAL $ 5,500 $ 7,500 $ 8,000 $ 9,000 $ 10,000 $ 49,500 $ $ 55,000 $ $ 46,598 $ $ 46,598 $ 8. PROJECT FINANCING 187,402 Sanitary Sewer Const Fund 187,402 TOTAL $ 55,000 $ $ 55,000 $ 55,500 $ 57,000 $ 63,000 $ 65,000 $ 63,000 $ 65,000 $ 63,000 $ 65,000 $ 61,000 $ 65,000 70,000 $ 75,000 $ 70,000 $ 75,000 70,000 $ 75,000 $ PROJECT DESCRIPTION This project provides for continuation of [he infiltration and inflow investigation program initiated in the Keyway Drive area to other parts of the sanitary sewer system. In Fiscal Year 2006, the Cily will seek a consultant to assist in evaluating 181 problems and assist in implementing a solution. In addition, the project provides for continued expansion of the long-term flow monitoring system that has been installed in conjunction with the Catfish interceptor sewer investigation. Initially the program would be directed to the Catfish Creek sanitary sewer line and Rosedale drainage area where major infiltration has been documented. This would include physical inspection, smoke testing, dye and Flood testing, flow isolation readings, sewer cleaning and televising, along with final report and problem modification. This also includes some portion of [he cost to repair or modify problems of the collection system. JUSTIFICATION Reduction of infiltration and inflow of storm water into the sanitary sewer system will reduce the potential for sewer backups as a result of rainfall and will reduce pumping costs at the W ater Pollution Control Plant. RELATIONSHIP TO OTHER PROJECTS This project is designed to correct problems relating to infiltration and inflow of storm water into the sanitary sewer system. This project implements the Comprehensive Plan's Infrastructure Element: Goals 2.1, 3.3, and 3.4; and the Environmental Quality Element: Goal 5.4. 218 EXP PRIOR ESTIMATED PROJECT BUDGET 2005-06 2006-07 2007-08 TO FY 05 FY 05 DEpARTM~NT,~~`~ """~ ~R€.`t]GRgM,, ~_ Putihc Wracks/Et1~l0~~flflQ RtaSlr~ess Typsa ~. ~~.~ EXP PRIOR ESTIMATED PROJECT BUDGET TO FY 05 FY 05 A. EXPENDITURE ITEMS Design & Engineering Land and R.O.W. Construction Other $ - $ - TOTAL 8. PROJECT FINANCING Sanitary Sewer Const. Fund - $ - TOTAL 97,500 30,000 650,000 TOTAL PROJECT COST $ 777 500 BEYOND 2010 - $ - $ - $ 777,500 $ - $ $ 777,500 - $ - $ -. .$ 777,500 $ - $ PROJECT DESCRIPTION Reconstruct the existing 12" clay pipe with 24" ductile iron pipe from Kensington Place to North of Pennsylvania Avenue. This project will include approximately 650 I f. open cut and approximately 700 I.f. of horizontal boring. Most of the alignment will be changed from its current location to avoid disrupting the existing sewer during construction. JUSTIFICATION The entire interceptor sewer from University Avenue to the N.W. Arterial is under sized to meet today's and future needs. Much of this sanitary sewer was constructed during the late 1960's and early 1970's before much of the development on the west end occurred. This sewer serves an area from Pennsylvania Avenue to Asbury Road and from Coder Road to Radford Road. Il also serves the Kennedy Mall area and the businesses along J.F.K. to University Avenue. This Phase is between Phase II and Phase III. This section was chosen as Phase I due to its severely poor condition. A portion of the sewer, in this Phase, is approximately 18 (eet deep and lies beneath a building and is currently in such poor condition that it has flow charasteristics nearing a 6" pipe. The sewer currently runs near capacity under dry conditions and under wet weather conditions is prone to surcharging. The City has been working to eliminate Inflow and Infiltration within this. drainage basin and has recently conducted a flow study on this line to help identify ,base sewage flows, wet weather flows, and any sub basins with higher than projected flows. RELATIONSHIP TO OTHER PROJECTS This project is one of Three Phases that needs to be completed to upgrade this interceptor sewer to meet current and future needs. The Third Phase will tie the upstream end of (his Phase into the sanitary sewer interceptor which will be reconstructed as part of the Keyway to Rosemont channel improvements project. Phase II will tie into the downstream end of this project and extend to a portion of sewer being reconstructed as pad of the University Avenue slope repair. This project also relates to identified issues within the ongoing I/I Study as part of the I/I Reduction Program. This project implements the Comprehensive Plan's Infrastructure Element: Goals 3.1, 3.4 and 1 1.2. 247 2005-06 2006-07 2007-OB 2006-09 2009-10 DEPARTMENT r j ~ ';~x ~~(~GRAM; `~ ~' `~. RROJ~~ ~TI~L.E~ "' ~'~ PRQGRAM'K'a6C ,~ ~~{„ TOTAL., . Public WorkslEngi~~~rlrt~ 8uam~esa Typ Catfish Cee~ )n~~reptor R~eonatrr~Gllon,. t? as : DEPARTMENT; b~ r~. PROJECT ~ ~~ ~, ^~ , Il UmVar t)y'l~~enGe t4 Kensingt~r! Plas F I41P NO ,714 r.~r COST ' '~ ~ r ~~ ;o ~ ' Fns ~' ` ae, ~.$~~~_ ,1-~ a wis „ z{~ t~~ a z~-'~,?..:F ti "- $ ~,. 84$,250 EXP PRIOR ESTIMATED pROJECT BUDGET 2005-06 2006-07 2007.08 2008-09 2009-10 BEYOND TO FY 05 FY OS 2010 A. EXPENDITURE ITEMS Design & Engineering $ 71,250 Land and R.O.W. $ 100,000 Construction $ 475,000 Other TOTAL $ - $ - $ - $ - $ 646,250 $ B. PROJECT FINANCING Sanitary Sewer Constr. Fund $ 646,250 TOTAL $ - $ - $ - $ - $ 646,250 $ PROJECT DESCRIPTION Reconstruct the existing 12" clay pipe with 24" ductile iron pipe from University Avenue to Kensington Place. This project will include approximately 4275 I.f. of sanitary sewer, land acquisition and easements, small sections of creek realignment and erosion protection for the new sewer. Most of the alignment will be changed from its current location to avoid disrupting the existing sewer during construction and to improve flow characteristics. JUSTIFICATION The entire interceptor sewer from University Avenue to the N.W. Arterial is under sized to meet today's and future needs. Much of this sanitary sewer was constructed during the late 1960's and early 1970's before much of the development on the west end occurred. This sewer serves an area from Pennsylvania Avenue to Asbury Road and from Carter Road to Radford Road. It also serves the Kennedy Mall area and the businesses along J.F.K. to University Avenue. This Phase will eliminate several 90 degree manholes which negatively effect flow characteristics. Some of the pipe is cracked and joints are leaking. There are three creek crossings that are in poor condition which are in need of replacement. Most of this Phase lies adjacent to the creek and is prone to inundation during high water events. The sewer currently runs near capacity under dry conditions and under wet weather conditions is prone to surcharging. The City has been working to eliminate Inflow and Infiltration within this drainage basin and has recently conducted a flow study on this line to help identify base sewage flows, wet weather flows, and any sub basins with higher than projected flows. RELATIONSHIP TO OTHER PROJECTS This project is one of Three Phases that needs to be completed to upgrade this interceptor sewer to meet current and future needs. This Phase will extend the larger pipe constructed under Phase I into a portion of This sewer being reconstructed as part of the University Avenue slope repair. This project also relates to identified issues within the ongoing Ill Study as part of the 1/I Reduction Program. This project implements the Comprehensive Plan's Infrastructure Element: Goals 3.1, 3.4 and 11.2. 248 oEPARTNf~NTt,~~" . •¢trk . Public VQorkslEnQlfte~fl~~~`~., ,~'~ a~ ` ~~ EXP PRIUR ESTIMATED TO FY 05 FY 05 RRCSGRAM~';'" 8~~`~ .; `w:., TQTAL„' .,' QEPARTMENT*`55 "PROJECT FDICIP NO }~~ 'F1flt~ ~~ ~ COST ' F~`~yi~, 2T.', s.".K`~a ~,v~r{"'-' $,.-- 201000 BEYOND PROJECT BUDGET 2005-06 2006-07 2007-08 2008-09 2009-10 2010 A. EXPENDITURE ITEMS $ 21,000 Design 8 Engineering $ 40,000 Land and R.O.W. $ 140,000 Construction Other TOTAL $ - $ - $ - $ - $ 201,000 $ e. PROJECT FINANCING $ 201.000 Sanitary Sewer Const. Fund _ _ _ $ 201,000 $ TOTAL $ - $ $ $ PROJECT DESCRIPTION Reconstruct the existing 12" clay pipe with 24" ductile iron pipe from North of Pennsylvania Avenue to Keyway. This project will include reconstructing approximately 140 I.f. of sanitary sewer, land acquisition and easements, small sections of creek realignment and erosion protection for the new sewer. Most of the alignment will be changed from its current location to avoid disrupting the existing sewer during construction and to improve flow characteristics. JUSTIFICATION The entire interceptor sewer from University Avenue to the N.W. Arterial is under sized to meet today's and furture needs. Much of this sanitary sewer was constructe during the late 1960's and early 1970's before much of the development on the west end occurred. This sewer serves an area from Pennsylvania Avenue to Asbury Road and from Carter Road to Radford Road. It also serves the Kennedy Mall area and the businesses along J.F.K. to University Avenue. This Phase will eliminate several 90 degree manholes which negatively effect flow characteristics. Some of the pipe is cracked and joints are leaking. There are several creek crossings that may be eliminated. Most of this Phase lies adjacent to the creek and is prone to inundationd wring high water events. The sewer will be relocated to a higher elevation to help alleviate infiltration into the manholes during high water conditions. The sewer currently runs near capacity under dry conditions and under wet weather conditions is prone to surcharging. The City has been working to eliminate inflow and infiltration within this drainage basin and has recently conducted a flow study on tis line to help identify base sewage flows, wet weather flows, and any sub basins with higher than projected flows. RELATIONSHIP TO OTHER PROJECTS This project is one of Three Phases that needs to be completed to upgrade this interceptor sewer to meet current and future needs. This Phase will extend the larger pipe constructed under Phase I land Phase II into the sanitary interceptor which wit Ibe reconstructed as part of the Keyway to Rosemont Channel Improvement Project. This project also relates to identified issues within the ongoing 1/I Study as part of the I/I Reduction Program. This project implements the Comprehensive Plan's Infrastructure Element: Goals 3.1, 3.4 and 11.2. 249 NORTH FORK CA TFISH CREEK SANITARY TRUNK SEWER STUDY DUBUQUE,lOWA . "~' t.,; T 1" H 1; ; 1, ~,r ;) '< -;' 1 t F .\ 1 1 ;..; ..: 1 " ;., ] :' ( ; April, 2005 FINAL REPORT , VEENSTRA Ei KlMM, INC. NORTH FORK CATFISH CREEK SANITARY TRUNK SEWER STUDY DUBUQUE, IOWA APRIL, 2005 Leo F. Foley, P.E. Iowa Registration No. 11708 My License Renewal Date is December 31, 2005 I hereby certify that this engineering document was prepared by me or under by direct personal supervision and that I am a duly licensed Professional Engineer under the laws of the State of Iowa. ~/X cf1 ofESS/o h ~'<' .Vf.X~N ,<l. "~'1 . <' ,S Leo F. I"') &V'lP; FoleYB~ yZ No. p- ?i:0\!4 1'~ .708 1~ 'q;,)~/-t,"" ~:* lOW."" * ' I:\"\~"" ' Date: Signed: '~,<y~~ " , i ! ;J-7/:J3- Prepared by VEENSTRA & KIMM, INC. Moline, Iowa TABLE OF CONTENTS EXECUTIVE SUMMARY ..................................... 1 SECTION 1 - INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 - PURPOSE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1 1.2 - SCOPE OF PROJECT . . . . . . . . . . . . . . . . . . . . .. 1-1 1.3 -AVAILABLE INFORMATION................. 1-2 1.4 - GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-3 SECTION 2 - PROJECT INFORMATION. .. . . . . .. . . . . . . . .. . . .. . . . 2 2.1 - LOCATION INFORMATION. .. . . .. . . .. . . . .... 2-1 2.2 - CENSUS DATA. . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1 2.3 - GROWTH PREDICTIONS. . . . . . . . . . . . . . . . . .. 2-1 2.4 - PLANNING PERIOD ....................... 2-1 2.5 - COST ESTIMATES. . . . . . . . . . . . . . . . . . . . . . .. 2-1 SECTION 3 - MODEL DEVELOPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.1 - SERVICE AREAS ......................... 3-1 3.2 - BASE FLOW DEVELOPMENT ............... 3-1 3.3 - EXTRANEOUS FLOW COMPONENT . . . . . . . . .. 3-2 3.4 - FUTURE FLOW DEVELOPMENT . . . . . . . . . . . .. 3-2 SECTION 4 - CONCLUSIONS/RECOMMENDA TIONS .............. 4 4.1 - GENERAL CONCLUSIONS. . . . . . . . . . . . . . . , . . 4-1 4.2 - ALTERNATIVES .......................... 4-1 4.3 - CALCULATED THEORETICAL FLOWS VERSUS ACTUAL FLOWS ......................... 4-2 4.4 - ANNEXATION AND CONCERNS FROM THE CITY OF ASBURY . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4.5 - FINAL NORTH FORK CATFISH CREEK CONCLUSIONS .......................... 4-3 VEENSTRA & KIMM, INC. TABLE OF CONTENTS SECTION 5 - COSTS OF IMPROVEMENTS & DISTRIBUTIONS ...... 5 5.1 - NORTH FORK CATFISH CREEK. . .. . . . . . . . .. 5-1 5.2 - I & I PROGRAM COSTS .................... 5-2 APPENDIX A - SANITARY SEWER MAPS APPENDIX B - SANITARY SEWER PROFILE APPENDIX C - CURRENT AND FUTURE FLOW CHART & GRAPH APPENDIX D - CURRENT AND FUTURE FLOW CHARTS, GRAPHS AND COST ESTIMATES FOR ALTERNATIVE SOLUTIONS APPENDIX E- CITY OF DUBUQUE FLOW METER STUDY APPENDIX F - CITY OF DUBUQUE FLOW METER STUDY COMPLETED BY VEENSTRA & KIMM, INC. APPENDIX G - CENSUS DATA APPENDIX H - EXAMPLE INFLOW AND INFILTRATION PROGRAM VEENSTRA & KIMM, INC. 1~ ,4 -~~ ~ ;;;; ;;,~ ; lilfe F~ ~ u ~l~ ~ ~iLj J \~ ~ ji;;"" J Il ~ -Cp ~ -:r: Hi-UI ~ ?S. \'-- 'J.JJ.~~CJ ~ , ~ F tlJ/JJ -E _ YjI I ct: It J J",!U r:i~ ~ 11~ : ~ - 7f. / ~ ! 'WI lj .\.-"',U : A 'V\u \. V.J.--- :If I/'~V ~ 'I T "' \I. 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