By Myrna Trauntvein
A draft of the Mona City Water Master plan was presented to the city council by Jesse Ralphs, PE, with Sunrise Engineering.
Ralphs said that the council should now review the draft and make comments on any ideas each of them might have on the document.
The immediate proposals (those which should be undertaken in the next five years or less) are the repair and replacement of six-inch PRV valves at an estimated cost of $16,000; a 10-inch tank transmission loop line at $327,750; replacement of cast iron pipe at an estimated cost of $97,375; reconfiguring water tank interconnect piping at an estimated $8,400; mobilization (5 percent) at an estimated $27,000; contingency (15 percent) at an estimated $71,479; and incidental and professional services at an estimated $140,500.
"The total for all the improvements would be an estimated $688,504," said Ralphs.
Intermediate improvements, those recommended for five to 10 years from now, are a 500,000 gallon concrete tank at an estimated $722,000; the replacement of lines smaller than four-inches at an estimated $307,500; mobilization (5 percent) at an estimated $64,000; contingency (15 percent) at an estimated $164,025; incidentals and professional services at an estimated $248,000.
"That total comes in at an estimated $1,505,525," said Ralphs.
Future capital improvements proposed for the next 10 to 20 years are the construction of a well at an estimated cost of $495,000; 10-inch line on Cemetery Lane at an estimated cost of $94,000; an eight-inch line on 300 North at an estimated cost of $66,650; mobilization (5 percent) at an estimated $40,000; contingency (15 percent) at an estimated cost of $104,378; incidentals and professional services at $315,000.
"The total for the future improvements comes in at an estimated $1,115,228," he said.
Population projections for Mona are that, in 20 years, the population will be 4,258 and in 40 years, it will be 10,268.
The 2010 census population was 1,547 and, currently, it is estimated that the population has grown to 1,765.
The average growth rate, said Ralphs, between 2005 and 2010 was 6.29 percent. The Utah Government Office of Planning and Budget for Juab County said the population growth rate was 2.63 percent with the average of the two rates at 4.5 percent.
"Current Connections, according to the current connections, are that there are 477 residential, 10 commercial and three institutional connections for 490 total," said Ralphs. "There are four areas of 'Parks and Cemeteries' (open irrigated space)."
Projected ERC (Equivalent Residential Connection) are that the 477 current ERCs will grow to 1,150 in 20 years and to 2,774 in 40 years. Commercial ERCs are at 10 currently but will grow, as estimated, to 24 in 20 years to 58 in 40 years. Institutional uses are at 12 ERCs which should grow to 29 in 20 years and to 70 in 40 years.
Current water rights: springs contribute 526 acre-feet; the Mona City Well contributes 204 acre-feet; other brings in 2 acre-feet. That provides a total of 732 acre-feet and means there are 593 acre-feet usable in the culinary system.
Required water rights at the current 378 acre-feet provides 215 acre-feet surplus; in 20 years there should be 913 acre-feet meaning there will be a 320 acre-feet deficit; and in 40 years there should be 2,236 acre-feet which show that there will be a 1.643 acre-foot deficit.
"However, the current requirement of 1.5 acre-feet per one-half acre lot will maintain adequate water right," said Ralphs.
The current source capacity, he said, is that Clover Creek Spring provides 240 gpm (gallons per minute) and Mona City Well provides 1,000 gpm for a total of 1,240 gpm.
The current source capacity is at 598 gpm with 642 gpm surplus.
In 20 years, there will need to be 1,460 gpm and at current capacity there will be a 220 gpm deficit and, in 40 years, there will need to be 3,578 gpm which will mean a 2,338 gpm deficit.
"Mona needs to begin planning for additional well (well siting, property acquisition, water rights)," said Ralphs. "Although the need is 14-years out, we recommend planning sooner than that."
The city has a current storage capacity of 750,000 gallons: in Tank 1 (concrete) there is capacity for 150,000 gallons; in Tank 2 (concrete) there is capacity for 250,000 gallons, and in Tank 3 (concrete) there is capacity for 350,000 gallons.
"The condition of Tank 2 and Tank 3 is that there are cold joints and leaks," said Ralphs. "You should plan on a 20 year maximum use."
Currently, there is storage capacity for 558,899 gallons which means the tanks provide 191,101 gallon surplus. But in 20 years there will need to be 1,230,281 gallons and in 40 years there will need to be 2,749,369 gallons stored.
"The city needs to begin planning for a series of new tanks," said Ralphs. "We recommend a 500,000 to 1,000,000 gallon tank in the next zero to 10 years and that the city reconfigure tank interconnect piping for circulation."
"Water meets all primary and secondary standards," he said.
Clover Creek is currently piped through the chlorinator building but the well is not piped through the building.
"We recommend that the city reconfigure well discharge piping to allow it to pass through the chlorinator building in order to provide the 'ability to disinfect,'" he said.
As far as the distribution system was concerned, said Ralphs in the study, there are good pressures under the current system demands and isolated low pressures under projected 20-year demands.
"Fire flow is generally above the minimum flow of 1,100 gpm under current conditions," said Ralphs. "The exception is the six-inch line north of Mona."
The five-inch cast iron "lead and oakum" pipes and undersized pipes should be replaced. However, most of the system is very well looped with a handful of areas that need help under projected demands.
It is recommended, said Ralphs, that the city immediately rebuild PRV 1 and PRV 2, the 10-inch tank transmission loop and replace the five-inch cast iron pipes.
"In the future, the city should replace all pipes under four-inches, do the 10-inch Cemetery Lane Line, do the eight-inch 300 North Loop and loop into the six-inch line north of Mona as growth occurs," he said.