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1c. 2010 I-I Smoke Testing: Approve Quote 1 c CITY OF MEMORANDUM 0 CIIAN uA�ijjA ( r HASSEN TO: Paul Oehme, Dir. of Public Works /City Engineer . , 7700 Market Boulevard FROM: Joseph Shamla, Project Engineer PO Box 147 Chanhassen, MN 55317 ��— DATE: June 14, 2010 6 Administration SUBJ: 2010 Inflow and Infiltration Abatement (I /I) Smoke Testing Phone: 952.227.1100 Project No. 10 -06: Approve Quote Fax: 952.227.1110 Building Inspections PROPOSED MOTION Phone: 952.227.1180 Fax: 952.227.1190 "The City Council approves a quote for smoke testing for the 2010 Inflow and Infiltration Abatement (I /I) Smoke Testing Project No. 10 -06 to Infrastructure Engineering Technologies ( Infratech), Inc. in the amount of $9,996.00." Phone: 952.227.1160 Fax: 952.227.1170 City Council approval requires a simple majority vote of the City Council Finance present. Phone: 952,227.1140 Fax: 952.227.1110 DISCUSSION Park & Recreation Phone: 952.227.1120 The 2010 I/I project was designed to eliminate groundwater or surface water from Fax: 952.227,1110 entering the sanitary sewer system. These improvements will include lining sewer pipes, pipe joint sealing, grouting manholes and pipe joints. This year's Recreation Center project will be done in two phases. Phase I will be to identify repairs by using 2310 Coulter Boulevard smoke testing inflow in several areas. Phase II will be bid for the repairs to the Phone: 952.227.1400 Fax 952.227.1404 sewer pipes and service laterals identified in Phase I and prior to televising work. The total proposed budget for the project is $105,000. As Council may recall, the Planning & remainder of the funds budgeted for this year's I/I project will be used on the Erie, Natural Resources Avenue and Red Cedar Point Neighborhood street improvement projects. Phone: 952.227,1130 Fax: 952.227.1110 Staff believes the areas that will be identified with the smoke testing process may Public Works contribute some of the highest levels of I/I to the system. 1591 Park Road Phone: 952.227.1300 The smoke testing areas include: Fax: 952.227.1310 96th Street & Summerfield /Springfield Areas Lotus Lake Rear Yard & Easement Areas Senior Center Lake Minnewashta Rear Yard & Easement Areas Phone: 952.227.1125 Fax: 952.227,1110 The total length of pipe proposed to be smoke tested is 35,700 feet. Web Site www.ci.chanhassen.mn.us Quotes received for this work are shown below. Infratech Technologies Inc. $9,996.00 $0.28 per LF • Visu- Sewer, Inc. $13,566.00 $0.38 per LF Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow Paul Oehme 2010 Sanitary Sewer Rehabilitation (I /I) Project June 14, 2010 Page 2 The low bidder for the project was Infratech Technologies, Inc. Infratech Technologies, Inc. has done previous work in the City and their work has been acceptable. Funding for this project has been budgeted for in the 2010 CIP, Project SS -012, and will be paid for by the Sewer Utility Fund. All work associated with this project is eligible for offsetting the MCES surcharge. Residents will be notified in advance of any smoke testing work planned in their neighborhood. For further information about smoke testing and to see a video, please visit http: / /www.rjn.com/sub smoke faqs.htm. Attachment: 1. Location Map 2. CIP Page SS -12 3. Smoke testing information g: \eng \public \_2010 projects \10 -06 2010 i -i \approve quote 061410.doc . It d M . _ ®" . ,+,y . . . v, b _ s' °w '''' ' or? 4 ..., , ,.. a y E E. 1 1 111 Lake 4 � iill C ,...., I & " .Y J- X111 , ~` s_ �,, ■ ■111 Min newashta ► mg , .\111 ..-� '�,�, °. ���� ffi .., . ` •� � " v O ,. g H a 1 111111 t. \ \' ,° q • St Joe a ° / � L S } t - e2 ' t„ w;,.c. fit . •• 9d� - ,»„ J ' .. 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Department Sanitary Sewer Improvements City of Chanhassen, MN Contact Paul Oehme j j Project # SS -012 Type Improvemen Project Name Inflow and Infiltration Abatement Useful Life Unassigned Category Utilities I, Account #1 701- 7024 -4751 Account #3 Priority n/a 1.i Account #2 Account #4 i Description 1 Total Project Cost: $825,000 I] ! This annual project includes televising, repairs and rehabilitation of existing sanitary sewer. The program also detects and eliminates points of entry of ground water and surface water into the City sanitary sewer system. Projects have been identified from the 2006 Inflow and Infiltration Report. The projects were reviewed by Metropolitan Council and approved in lieu of surcharge fees. Justification City staff has identified numerous older sewer lines that are in need of repair. The City of Chanhassen pays the Metropolitan Council for sewage treatment. Those payments are based on the amount of flow generated by the City of Chanhassen. Surface water and ground water that makes its way into the system either through breaks, displaced joints, manhole covers, or private connections to the system increase the amount charged to the City for sewage disposal and. increasing the load on the City's lift stations. Also, MCES would place a surcharge on the annual charge if the City was not actively trying to reduce the inflow and infiltration problem. i ' Prior Expenditures 2010 2011 2012 2013 2014 Total ; 200,0001 Maintenance 200,000 200,000 75,000 75,000 75,000 625,000 Total Total 200,000 200,000 75,000 75,000 75,000 625,000 j ■ Prior Funding Sources 2010 2011 2012 2013 2014 Total 200,0001 Sewer Utility Fund 200,000 200,000 75,000 75,000 75,000 625,000 Total Total 200,000 200,000 75,000 75,000 75,000 625,000 • is Budget Impact/Other 1 he efforts may decrease operational costs, MCES fees and emergency call outs. It is also the City's intent to use connection charges to help fund or those costs. It is the City's belief that as new customers come on line those connection fees should help fund future infiltration problems. I I. i fi' 89 BENEFITS OF SMOKE TESTING A COLLECTION SYSTEM Smoke testing is one of the most efficient and cost - effective ways to locate and identify the source of an inflow or infiltration problem. It is important to find and identify these sources because they may seriously affect the efficiency of the wastewater treatment facility and increase operating expenses. Some examples of the impact that inflow and infiltration may cause are: - Sewer may not be able to handle the volume flow and the sewer backups into properties. The City is charged for the volume of flow in the sewer. The more clear water in the sewer the more the City is charged for treatment which is then charged to the residents. - Pump stations handling large volumes of unnecessary water - Unnecessary equipment wear - Increased collection system maintenance and cleaning There are a few factors to consider when deciding if implementing a smoke testing program will be beneficial to your city. For example, what ages and types of materials are used in the sewer collection system? Many sanitary systems in this area are old and are constructed of out -dated materials. Over time, decay and roots cause breaks in the lines that will permit excessive infiltration during wet periods. The presence of undesired connections such as basement and yard drains, catch basins, cross connections from storm sewers, foundation drains, and roof downspouts will cause elevated flows every time it rains. Smoke testing is a very quick and easy way to determine if buildings are properly connected to your system. Smoke should exit the vent stacks of the surrounding properties within the testing area. If traces of the smoke or its odor enter the building, it is an indication that gases from the sewer system may also be entering. If smoke is entering their home or business, sewer gases could be entering as well. The smoke that is manufactured specifically for testing is not dangerous or toxic, leaves no residuals or stains, and has no effects on plants or animals. It has a distinctive, but not unpleasant, odor. The visible smoke and odor will last for only a few minutes if there is adequate ventilation. A few of these sewer gases have no odor and present the most serious problem because they can enter a building undetected. These gases can cause anything from minor illness to death. Identifying and correcting the source of any smoke entering a building is urgently advised. HOW DOES SMOKE TESTING WORK? Smoke testing is conducted by placing a blower over a centrally- located manhole and forcing non- toxic smoke - filled air through a sewer line. Depending on the equipment being used, the smoke will be generated by lighting a smoke bomb or utilizing liquid smoke. The smoke under pressure will fill the main line and any connections. It then follows the path of the leak to the ground surface, quickly revealing the source of inflow and infiltration. Only enough force to overcome atmospheric pressure is required. After placing the blower and filling the lines with smoke, staff must perform a visual inspection of the area being tested. Typically, you will let the smoke run until the crew has had ample time to do a thorough inspection. Check all connected lines, including abandoned and disconnected service lines. It is important to carefully check around houses, with close attention given to cleanouts and roof leaders. It is not uncommon to see smoke coming out of the grass, wooded areas, or cracks in the pavement. If smoke is found during the inspection, it must be carefully recorded so that it can be corrected after the testing. Taking pictures also helps relocate the problem after testing so that staff can take corrective measures. It is also proof that the leak was found. As long as openings exist for the smoke to follow, smoke tests are effective, regardless of surface type, soil type, and depth of the lines. The best results are obtained when the water tables are low and the days are dry because water is an excellent vapor barrier. Smoke testing should also be avoided on windy days because even a very light breeze can disperse a wisp of smoke before it is visible at the source of a leak.