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HomeMy WebLinkAboutAugust 4, 1997 Work SessionCiTY OF COLUMBIA HEIGHTS 590 40TH AVENUe N.E., COLUMBIA HEIGHTS, MN 55421-3878 (612) 782~2800 TDD 782-2806 NOTICE ADMINISTRATION OF COUNCIL WORK SESSION Mayor Joseph Sturdcvant Councilmembers Donald G. Jolly Meg Jones Gar)' L. Peterson Robert It: Raettbnann City Manager Walt Fehst Notice is hereby given that a Council Work Session is to be held itl tile CITY OF COLUMBIA HEIGHTS as follows: Meeting of: CITY COUNCIL, CITY 3IANAGER AND CITY STAFF Date of Meeting: MONDAY, AUGUST 4, 1997 Time of Meethlg: 6:30 P.M. Location of Meeting: CITY HALL CONFERENCE ROOM Purpose of Meeting: COUNCIL WORK' SESSION AGENDA 0 2) 3) 4) Work Plan for Storm Water Problems Watermahl Cleaning - Innsbnlck & Argonne Federal Police Grant Funding Dispose of City Equipment The City of Cohtmbia Heights does /rot discriminate on tile basis of disabiliO, in tile admission or access to, or treatment or employment in, its sero,ices, program~, or activities. Upon request, accom/nodation will be provided to allow individuals with disabilities to participate #l all CiO, of Columbia Heights' sero,ices, programs, and activities. Auxiliary aids for handicapped persons are available upon request when t/re request is made at least 96 hours hi advance. Please call the City Cormcil SecretaO' at 782-2800, Extension 209, To l/lake arrangements. (TDD/782-2806 for deaf onl)9 THE CITY OF COLUMBIA HEIGHTS DOES NOT DISCRIMINATE ON THE BASIS OF DISABILITY IN EMPLOYMENT OR THE PROVISION OF SERVICES EQUAL OPPORTUNITY EMPLOYER CITY OF COLUlVlBIA HEIGHTS Public Works Department TO: FROM: SUBJECT: MAYOR AND CITY COUNCIL WALT FEHST, CITY MANAGER /l ;7OR/~ Y ENGINEER WORK PLAN FOR STORM WATER PROBLEMS DATE: July 31, 1997 Staff has been reviewing the flooding problems caused by the heavy rains that fell on July 1 and July 11. Attached you will find a map of the City indicating the areas that we are aware of that experienced basement flooding due to backups in the sanitary sewer system or due to direct entry of water through lower level openings. What's been done so far Of course, during the storms, the crexvs have been out clearing catch basins and barricading flooded streets. Public Works has concentrated on getting the storm and sanitary systems back in working shape since the storms. Areas of significant erosion have been filled. Crews have been checking and cleaning catch basins and manholes that have been filled with debris due to the storms. The water levels of the various lakes and ponds have been drawn down to provide detention storage should additional down pours occur. Staff has tried to respond to all phone calls from residents about flooding with at least a visit. Areas of Concern Jackson Pond area Jackson pond reacted as designed to the storm in that it did not overflow. Street flooding on Quincy Street adjacent to the pond was primarily due to clogged catch basins and surcharging in the catch basins that would not allow the water to drain out. When the level exceeded the top of the berm, the run off eroded the bank. A large amount of water came down 43rd Avenue from Central when the catch basins could not handle the flow. This water went down the existing small concrete spillway but ended up seriously eroding the bank which eventually failed. A number of homes in this area experienced sanitary sewer back ups. The trunk line in this area carries a large amount flow during storms. It is assumed that this is due to a large number of sump pumps connected to the sanitary system. An surcharge overflow was placed in this line a number of years ago to reduce the occurrence of sewer backups. During high sewer flows, this system spills over into a line that goes to Jackson Pond. Staff feels that the rapid rise of water in Jackson Pond during the storms caused storm water to flow into the sanitary system for a period of time, making the back ups worse. WORK PLAN FOR STORM WATER PROBLEMS Page 2 Staff feels that a concrete spillway should be constructed at the existing catch basins on Quincy Street in order to reduce the level of street flooding in this area. A larger concrete spillway should be constructed on the 43ra Avenue side to adequately handle the large amount of water that comes down 43rd, Quincy, Jackson and Van Buren during heavy rainfalls. The two spill ways would greatly reduce the potential for basement flooding due to water standing in the street. In order to reduce the potential for sanitary sewer backups, the existing sanitary sewer overflow structure needs to be modified to prevent water from Jackson Pond from backing in to the sanitary sewer. Staff is researching methods of accomplishing this. The ultimate solution is to eliminate the illegal sump pump connections to the sanitary system. This will be a difficult and time consuming task. Many homeowners are not even aware that there sump pumps are discharging to the sanitary system or that this practice is prohibited. Changing the discharge point from the sewer to pumping out to the yard can be expensive. In order to locate the homes with illegal connections, either a visual inspection or smoke testing will need to be done. Obtaining compliance may take the use of fines, surcharges on sewer bills for homes with illegal connections and/or low interest loans from the City to assist with the disconnection. Attached is a copy of a brochure that Fridley used for their disconnection program. 49 ~ and Monroe/40th and McKinley areas These two areas experience street flooding during heavy rains. Except for extremely heavy down pours, the water does not reach the houses to cause basement flooding. Several homes had water in their basements from the two heavy storms in July. The residents are very concerned about the street flooding that does occur as they are never sure it will stop before it reaches their home. Staff feels that the storm sewer systems in these areas are adequate for handling storms up to the 100 year event, but that the systems should be studied to see what solutions are available to reduce the occurrence of street flooding and what the costs would be for these solutions. Once the solutions and their costs are identified, the Council can xveigh the benefits against the cost. 38th to 39th from 2nd to Main, 46th and Washington, 4300 blocks of Washington and Jefferson These areas had some basement flooding due to street flooding. These are low areas that collect a large amount of water when the runoff exceeds the capacity of catch basins in the area or there are blockages of the catch basins due to debris. These areas should be studied along with the above areas. 44th and Tyler Place The house at 4016 44th had water in the lower level during both the July 1 and July 11 storms and the garden level units of the three apartment buildings on Tyler Place were flooded during the July 11 event. The 48" storm sewer main in this area is very shallow and any surcharging of the system causes water to come up through the catch basin in the back yard of 4016. The storage building/garage in the back yard of 4016 is very low and probably gets water often. The flooding of the apartments was probably due to a major surcharging of the storm sewer as the line was WORK PLAN FOR STORM WATER PROBL'EMS Page 3 carrying a larger amount of discharge from LaBelle Pond than ususal due to the high water level caused by the July 1 storm. Staff has implemented a policy of taking down the level of all ponds and lakes quickly after a storm in order to provide as much detention capacity for succeeding storms. There are no simple solutions to reducing the potential for flooding at 4016 due to depth of storm main and the elevation of the house. 4945 Fillmore This house suffered some basement flooding due to a plugged catch basin in the backyard. Public Works staff were not even aware that there was a catch basin or storm sewer at this location. It is believed that this is a private line and not the responsibility of the City. Homes in Fridley on 52nd Avenue The system improvements made a few years ago did not handle the runoff from these storms. The design of the improvements were based on a 100 year storm. It is felt that the amount of water exceeded the design capacity. The property owners are looking to the two cities to make additional improvements to protect their homes from flooding. A solution put forth by Fridley is to jack a pipe through the hill behind the Strand residence to provide an overflow. The estimated cost is $16,000 of which Columbia Heights would be responsible for $8,000. Sca[gered sites There ~vere several scattered incidents of basement flooding. These will be reviewed by staff on a case by case basis to look at solutions. There are also numerous areas where there was street flooding that did not result in water entering homes. These areas will be looked at to determine if there are ways to reduce the frequency of street flooding. Recommendations Staff recommends that a consulting engineering firm be contracted to assist staff in identifying solutions for the major flooding areas. A consultant will have on staff expertise in storm systems in order to analyze the system. The consultant would be directed to look at specific areas. The new spillways at Jackson Pond should installed as part of the repair to the eroded banks and modifications made to the overflow structure should be made. A concentrated effort should be made to eliminate illegal sump pump connections. An informational brochure on landscaping and building practices that will reduce the possibility of water getting into the basement should be prepared and distributed to the residents. Costs It is not possible to determine or even estimate the cost of correcting these problems. The consulting work, depending on scope and actual construction undertaken to correct problems, will be in the range of $10,000 to $50,000. III IIII tQ3&INR BH& NI AM¥SS303N 39VZSOd ON 6966-~'1~gg NI/~ =IN =If"INEIA¥ AZIS~I=IAINR I.g'~9 A]3A~INS dlAINcl clIAIN9 :NJ.LV AzI-IC] 1~1-3 '_-I0 ~]SS'qNQQV A~ C]lYd :~ 'FIlAA ':IOVJ. Sod -iiVIAI A-Iclq~! SS::INISr'I~I I! CITYOF FRIDLEY CITY OF FRIDLEY 6431 University Avenue NE. Fridley, MN 55432 571-3450 CAR-RT-SORT BULKRATE U,S. POSTAGE PAID Minneapolis, .MN Permit No. 2886 POSTAL CUSTOMER Important UtiBty Information Enclosed o ~ ~o TO: FROM: SUBJECT: DATE: CITY OF COLUMBIA HEIGHTS Public Works Department MAYOR & CITY COUNCIL WALT FEHST, CITY MARK A. WrNSON, PUBLIC WORKS DIRE(/FOR/CITY ENGINEER WATER MAIN CLEANING - INNSBRUCK AND ARGONNE July 31, 1997 Attached is the response from H.E.R.C. with regard to the cleaning and lining of the Innsbruck and Argonne water mains. It is my opinion that lining the pipes will eliminate the colored water problems that are being experienced in this area. The Argonne line should be cleaned as the flow is very restricted in this area apparently due to tuberculation, in the line. As we will need to excavate at everY valve in order for the lining process to be done, we will be replacing all the valves with new valves. When complete, this will essentially be a new main and should last another 30-50 years. ~ There is $60,000 budgeted in the'Water Capital Improvement Fund for water main cleaning. The overall cost to clean and line the Argonne main and to line the Innsbruck main is $77,785. There are sufficient available budgeted funds in that the master water meter will not be replaced this year. It is my recommendation that the proposal be accepted. · ,07/23/97 13:04 FAX 9108581169~ HERC-GREENSBORO ~% July 23,1997 PRODUCTS INCORPORATED Mr. Mark Winson Public Works Director/City Engineer City of Columbia Heights 637 38~ Ave. NE Columbia Heights, MN 55421 VIA FACSIMILE RE: Additional Potable Water Line Rehabilitation Services Dear Mr. Mark: Thanks for your letter dated July 11, ,1997. We have had a chance to digest the situation concerning the incidence of continued red water complaints in the Innsbruck Parkway area and agree that the best way to assure total elimination of furl. her (or continued) problems will be to go back and complete the cleaning and than apply our epoxy coating to the inside of the pipes. in order to save time we Will, via this letter, provide the City with our firm price quotation to re-clean (at our expense) and epoxy line the Innsbruck Parkway area. as well as clean and epoxy line the Argonne Dr. water main. The cleaning will be performed with our rack feed bodng machine. Our pdce quotation is provided in attachment "A' of this letter. Note that it will be necessary for Herc to have a finn commitment from the City to epoxy [[ne both the Innsbruck Parkway and Argonne Dr. areas before we can mobilize to Columbia Heights. At this point, we have a potential scheduling conflict during the month of September, however the sooner the City can commit to Hem the above scope the quicker we can work to resolve the scheduling conflict, i Concerning the City's request for Hen:; to produce a letter to the residence of the Innsbruck Parkway area we are comfortable with the rewording shown in attachment "Bm. Additionally, Herc can only agree to c~ntinue to cover the cost of the corrosion inhibitom through September 30, 1997. We understand the potentJal issues that this may cause however, if the City elects to retain Hem to epoxy line the tnnsbruck area the inhibitors would no longer be required to sequester red water. Lastly, even though the Innsbruck Path/cay water main has !some residual tuberculation remaining it is obvious that the water flows have greatly increased, which !as we understand it was the original goal of the project ~ increased "O' factors. We must respectfully ask that the City remember how difficult it was t~ maintain high flow rates of the Pipe-I/Jean cleaning soldtion in several areas because of faulty water main valves. It is likely that the residual material is a result of our inability to run the recirculation unit at high speed because of this water valve problem. North Carolina Office: 2 Centervtew Dr,, Ptnehurs[ Bldg. Suite 52, Greensboro, North Carolina 27407, (910) 856-1611, Fax: (910) 855-3126 Corporate Office: 2202 W. Cactus Drive * Phoenix. Arizona 85027 · (602) 492-0338 * Fax: (602) 233-1107 07/25/97 15:04 FAX 9108561169 HERC-GREENSBOR0 We remain committed to maintaining a positive relationship with the City of Columbia Heights, and are certain that Herc's Cleaning and Epoxy Lining seduces will get the City the results that you desire in both the Innsbruck and Argonne Dr. areas. Sincerely, HERC PRODUCTS INC. Darin H Thomas Division Manager-Industrial Products Group DHT/hms ; cc: Myron Shenkiryk-Hem Steve Carl - Herc attachments '0?/25/97 15:04 FA~ 9108561169 HERC-GREENSBORO A TTACHMENTAo innsbruck Parkway Area Re-Clean & Epoxy Line Price Quotation 1 2 3 4 5 6 7 8 9 t0 Mobilization Planning & Engineering On-Site Supervision Temporary Water Lines Disinfection of Temp. Lines Pipe Cleaning Pow'er Boring ~ Excavation & V~l've Replacement (10 Excavations' ~ pits estimate onlyl) Epoxy Lini~b 6" CCTV Disinfection & Testing Total Cost of Project Total Cost Per Linear Foot Lump Sum Lump Sum Lump Sum 2,640 If x $2.50/tf 2,640 If x $.50/If /' 2,640 if x $8.50tlf By City of Columbia Heights 2,640 If x $13.00/1f 2,640 If x $1.00/If By City of Columbia Heights $1,500 $1,000 $1,000 N/C N/C N/C $0 $34,320 N/C $0 37,820 $ 14.33 ~7/23/~7 13:04 FAX 9108561169 HERC-GREENSBORO A TTACIYMENT A.-Cont. Arcjonne Dr. Area Clean & Epoxy Line Price Quotation 1 2 3 4 5 6 7 Mobilization Planning & Engineering 'On-Site Supervision Temporary Water Lines Disinfection of Temp. Lines': Pipe Cleaning Power Boring Excavation & Valve Replacement (7 Excavations pits estimatel only!) 8 Epoxy Lining 6" 9 CCTV 10 Disinfection & Testing Total Cost of Project Lump Sum Lump Sum Lump Sum 1,430 If x $2.50tlf 1,430 if x $.50/If / 1,430 Ifx $8.50ftf By City of Columbia Heights 1,430 If x $13.00/If i,430 If x $1.00/lf By City of Columbia Heights Total Cost Per Linear Foot $1,500 $1,000 $1,000 $3,575 $715 $12,155 $0 $18,590 $1,430 $0 $39,965 $27.95 ,97/23/97 13:04 FAX 9105561169 HERC-GREENSBORO ~06 A T, rACHMENT B. Dear Innsbruck Area Resident! In 1996, H,ERC, was contracted by the City of Columbia Heights to clean the water main that serves your home of iron tuberculation in order to improve flows through these dirty pipes. Iron tuberculation is a naturally forming growth in water mains over time. In the case of the water main serving your home, the iron tuberculation had decreased the interior size of the pipe to the point where it was restricting the flow of water. In the past, the methods generally used to correct this situation have been expensive replacement of the lines. Most replacement methods are expensive, time consuming and require extensive excavation 'and disruption to the area. The process used by H.E.R.C. involved circulating a cleaning solution through the water mains to soften and flush out the iron tuberculation. '~ During September, 1996, this iprocess was used to clean the water mains in the lnnsbruck area. For the most part the Cleaning process was successful. Water flow in the line is significantly greater than before the cleaning process was done. Unfortunately, many of you have experienced an ongoing or reoccurring problem with discolored water since the time of the cleaning. The discoloration is iron oxide or, as commonly referred to as, rust.: The City has monitored the water on a continuous basis to assure that it meets health department standards for potable water. City and HE.R.C. have been investigating the cause of this discoloration. it would appear that the disCOloration water is caused by one or more of the following conditions: ~ 1. Incomplete cleaning of some of the lines potentially due to some faulty valves in the Innsbruck water lines which at times prevented H.E.R.C from running the recirculation units at maximum speed. ; 2. Rust deposits from lines outside of the area that was cleaned that are being scoured due to the increased flow through newly cleaned lines 3. Formation of new rust on the bare metal surface exposed in the pipes due to the cleaning process. During a water break repair operation the City removed a portion of the cleaned line and it was found that this portion still contained a coating of iron tuberculation, It is thought that this condition is localized and is not representative of the entire section of lines that were cleaned. Currently H.E.R,C. iand the City are working on a plan that will have H.ER.C returning to Columbia Heights to televise all of the line that was cleaned. Any sections found to contain these iron deposits Will be cleaned. Additionally, to prevent any future re-cjrowth of these deposits H.E.R.C. ,Mil be applying thin plastic coating to the insides of the pips. This operation will involve putting all the affected homes on a temporary water system again for a period of time, The City and H.ER.C. are in the process of determining the exact dates '07/23/9? 13: 0~ FA.'f 9105561169; I4ERC-GREENSBORO [~ 07 of this operation, but it is expeCted at this point to occur in September of this year. You will be notified of the exact dates when they are determined. We at HER.C. want to assure you that we are committed to helping the City to provide you with the best possible quality of water for your needs. Sincerely, ~ HER.C, Products Inc. 07/23/97 13;04 FAX 9105,561169 HERC-GREENSBORO