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Minutes - 02/03/1997 Workshop COUNCIL WORKSHOP MEETING MINUTES February 3. 1997 TAPE READING 0001 DATE. COUNCIL CHAMBERS, CITY HALL, CITY OF WOODBURN, COUNTY OF MARION, STATE OF OREGON, FEBRUARY 3,1997. 0003 CONVENED. The Council met in a workshop session on the Water Master Plan at 7:05 p.m. with Mayor Kirksey presiding. ROLL CALL. Mayor Councilor Councilor Councilor Councilor Councilor Councilor Kirksey Chadwick Figley Hagenauer Jennings Pugh S ifuentez Present Present Present Present Present Present Present Staff Present: Public Works Director Tiwari, Public Works Manager Rohman, Water Superintendent Schooler, City Recorder Tennant 0012 WATER MASTER PLAN. Public Works Manager Rohman introduced to the Council HDR Engineering Consultant Alan Larson who had assisted in the formulation of the Plan. Randy Rohman proceeded to outline federal/state requirements pertaining to the City's need to periodically update the Water Master Plan. The main objectives of the master plan is to focus on 1) public demands for water quality and supply; 2) comply with water quality regulations; 3) provide reliable fire protection; and 4) economically meet future needs of the consumers. The Master Plan looks at where the water comes from, the water quality, and how much is used by the public. The City's groundwater supply meets all federal and state water quality standards, however, we do have an aesthetic problem with the water relating to the iron and manganese levels which leaves rust and/or black stains and can affect the taste of the water. Staff is also anticipating a future groundwater disinfection rule and treatment may require secondary disinfection using cWorine. Water quality rules established over the next two to four years may significantly reduce the arsenic limit which is well below current limits within the City's water supply. 0325 Alan Larson, HDR Engineering, stated that they had researched various methods to remove the iron and manganese levels. The four water treatment options available to the City are 1) Ozone followed by filtration, 2) CWorine and Potassium permanganate followed by filtration, 3) Biological Filtration, and 4) Potassium permanganate oxidation followed by filtration. In their opinion, the best treatment option is the potassium Page 1 - Council Workshop Meeting Minutes, February 3, 1997 I..-~--_. 11 I ..'" 'II COUNCIL WORKSHOP MEETING MINUTES February 3, 1997 TAPE READING permanganate oxidation and filtration since this process would eliminate the need for adding chlorine as a primary disinfectant and it would remove the iron and manganese from the water. This option is also a very reliable and flexible method. As a reminder, under state water quality rules, if a primary disinfectant is used then we are required to have a secondary disinfectant which would ultimately involve adding chlorine to the water supply. Another issue addressed by the consultants was how many plants would be necessary to treat the water. Options include 1) a centralized treatment facility, 2) a decentralized system requiring a treatment system at each wellhead, and 3) providing two centralized facilities. The study results show that the two treatment facilities is the most cost effective since it offers low overall cost, the ability to phase implementation, it has a low impact on the community and neighborhoods, and provides system reliability. If this option is incorporated into the Plan, one of the two plants would be on-line in the year 2002 with the second plant on-line in the year 2010 or 2012. One plant would be located in the north/northeast section of the City while the other plant would be located in the south/southwest section of the City. It would be necessary to install piping from the wells to the treatment facility after which the water is carried back to residences and businesses. It was noted that the West Woodburn well would not be connected to the first treatment facility, however, except for high usage days during the SUmmer months, the residents in this area would receive treated water. The treatment facilities would require approximately 1/2 acre of land. In regards to daily operation, each plant would require someone to check the plant daily and replenish chemical supplies. Brief discussion was held on the aquifer level from which our wells pump water and it was noted that the water flows from the south to the north, therefore. there is little concern regarding potential water contamination from the Marion County landfill. 1600 Another issue included in the Plan involves fire protection. The Consultants had prepared a computer model that looks at the City's distribution system for the purpose of analyzing where the weak locations are in the system. This information can then be used by the City to determine future pipe size and water flow as it relates to new development and/or system improvements. 1700 Mr. Larson informed the Council that the City is deficient in storage capacity and it is recommended that an reservoirs totaling 4.4 million gallons of storage be constructed to meet the demands of the system and provide adequate water supply during emergencies. A 2.2 millon gallon ground level reservoir with a pumping system would be located at each treatment facility. These reservoirs, in addition to our existing. 75 million gallon storage tank, would be sufficient to meet the long range needs of the City. 1932 SUMMARY OF IMPROVEMENT COSTS. Public Works Manager Rohman stated that the estimated capital costs for the two treatment facilities, with reservoirs, is $20.6 million in 1996 dollars. Of this amount, Page 2 - Council Workshop Meeting Minutes, February 3, 1997 r '-"--"-'-"~ ~ . .' --..., " COUNCIL WORKSHOP MEETING MINUTES February 3, 1997 TAPE READING $9.6 million would be required to correct the system as it now exists and $11 million to accommodate future growth. He reiterated that there are no federal mandates at this time that would require the City to move forward with water treatment. 2387 Gil Flaugher suggested that the Council consider a gradual phase-in of increased water rates to start building a reserve for future system improvements. Tape 2 Brief discussion was held regarding the rate issue and several Councilors expressed preference to look at modest increases over the next few year rather than implementing a sharp increase in rates. It was the consensus of the Council that the overall Plan looks acceptable and should be presented to Council for approval, however, the financial issues need to be discussed in more depth over the next few months. 0075 The meeting concluded at 8:32 p.m.. APPROVED ~./-;;;pr~A~) NANCY A. KI~EY, MAYOR / ATTEST Ma Te t, Recorder City of Woodburn, Oregon ****REFER TO MINUTES OF FEBRUARY 24, 1997 FOR AN ADDITION TO THE MINUTES. Page 3 - Council Workshop Meeting Minutes, February 3, 1997 -r- '-'-".