City of Parshall, ND Municipal Infrastructure Needs Assessment August 2012

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1 City of Parshall, ND Municipal Infrastructure Needs Assessment August 2012 Project made possible by US Dept. of HUD Regional Substantiality Planning Grant and ND Energy Development Infrastructure and Impact Grant Fund programs

2 Summary of Needs Assessment The City of Parshall, located in Mountrail County, North Dakota, is experiencing a population increase due to energy development activities. Permanent residents have grown from 903 to 957, or six percent, from the 2010 Census to the 2011 Census estimate, but City officials stated that the present estimated actual (permanent and transient) population in the area is close to 1,800 people. The City s current estimate represents a 99 percent difference from the 2010 Census. The City is currently planning for a population of 4,000 people. The infrastructure needs assessment is intended as a highlevel analysis and concept planning effort focused on key short-term infrastructure needs to accommodate the anticipated growth and development. Table 1 summarizes the infrastructure needs assessment, proposed improvements, and opinion of costs included within this report. DESCRIPTION TABLE 1 SUMMARY OF INFRASTRUCTURE IMPROVEMENTS AND COST OPINION COST OPINION Water System Improvements $ 80,000 Wastewater System Improvements $ 10,924,000 Street and Stormwater System Improvements $ 16,758,000 TOTAL OPINION OF COST $ 27,762,000 Introduction The Vision West ND initiative was commenced in February 2012 to provide planning and technical assistance to a rapidly expanding 19-county area in western North Dakota. The primary goals of the Vision West ND project are to assist communities and counties in the western region of North Dakota to address near-term needs and meet growth management challenges, and establish a diversified economy in the future through the development of local and regional strategic plans. Rapid population growth is exerting significant pressure on existing municipal water, sewer, and street systems, and in some cases, infrastructure expansion is necessary to support current and anticipated growth. Participating communities will receive a high-level infrastructure assessment to identify needs and prioritize infrastructure improvements, with opinions of probable costs by a professional engineering team. Building Communities, Inc. is the lead strategic planner engaged in the Vision West ND initiative and has subcontracted with Advanced Engineering & Environmental Services (AE2S) to provide technical expertise regarding municipal infrastructure. This report includes brief infrastructure inventory, needs assessment, and opinions of probable costs for infrastructure improvements for the City of Parshall, North Dakota. The information used to City of Parshall Infrastructure Needs Assessment 2

3 prepare this assessment for the City of Parshall was compiled by AE2S based on information provided by City officials. COMMUNITY OVERVIEW The City of Parshall (City) is located within the jurisdictional boundary of the Mandan, Hidatsa, Arikara Nation. The City is located on the Fort Berthold Reservation in Mountrail County. Mountrail County is the State s leading oil producing county, with oil production in 2011 of 49 million barrels. Oil production in Mountrail County has increased from 223,220 barrels in 2005 to 49 million barrels in 2011 nearly a 22,000 percent increase. The ND Department of Mineral Resources projects oil production in Mountrail County will exceed 90 million barrels by the end of The oil company EOG discovered oil in the Parshall oil field in This discovery includes some of the most productive on-shore oil wells in the United States. There are producing oil wells surrounding the City. Parshall City of Parshall Infrastructure Needs Assessment 3

4 Barrels of Oil There are currently 35 oil rigs active in Mountrail County. There are an estimated 124 direct jobs attributed to each oil rig which would total 4,340 jobs (people) in Mountrail County directly supporting oil development. The ND Housing Finance Agency estimates 2.5 indirect jobs are created for each direct job as well as an additional multiplier of 2.0 for each job to account for family 60,000,000 50,000,000 40,000,000 30,000,000 20,000,000 10,000,000 0 Mountrail County Annual Oil Production ,877% Increase members who move with these new employees. These multipliers result in a potential population impact in Mountrail County of 21,700 people. The City operates a bulk water depot to supply frack water to the oil industry for wells in the Parshall area. Bulk water is sold at $20 per thousand gallons (kgal). This has become an excellent revenue stream for the City, but it has resulted in substantial industrial truck traffic. The City currently has 402 water accounts, and City officials estimate 35 percent of these accounts are related to residents employed in the oil industry. The City s monthly residential water rate includes a base rate of $26.00 plus $2.10/kgal. The City s monthly commercial rate on accounts served by a oneinch or larger water meter is $269.75, plus $3.00/kgal. The City is located on the Fort Berthold Indian Reservation, resulting in a significant amount of triballyowned tax-exempt property within the City. Approximately 75 percent of the property within the City is tax-exempt. Continued development of non-tribal property within the City will diversify and expand its property tax base to support future development. CURRENT AND PLANNED DEVELOPMENT In the fall of 2011, the City annexed 1,531 acres, which represented a 440 percent growth in the City s land mass. Unique to the City s water supply, in that it pertains to future growth in the newly annexed area is that Fort Berthold Rural Water will supply water to all areas other than the original boundaries of the City. The City is, however, responsible for sewer service to the newly annexed areas. A 20-unit apartment complex, completed in 2010, is at full occupancy with a long waiting list of people interested in housing. A 114-unit RV park was recently added in the newly annexed area in the northern part of the City. The RV park is fully occupied and may expand with 100 additional lots. An City of Parshall Infrastructure Needs Assessment 4

5 88-unit mobile home court will be completed in the fall of Questar Oil constructed an office complex in the area annexed to the east of the City s original boundary. The Highlands Development will be extensive, with 240 acres in the northwestern corner of the City. This development will include 680 single family homes, six townhomes, four hotels, and six commercial lots. Construction will begin on 20 single family homes in the fall of There are several pending developments east of Highway 37. These developments include: 114 Unit RV Park. A 114 unit RV park has been constructed to serve as temporary housing for oil patch employees, as well as recreational visitors taking advantage of the increased tourism activity in the area. There is a pending possible expansion of an additional 100 units at this site. Commercial Development Site. This 114 acre property has pending discussions related to a new restaurant and motel. New Residential and Commercial Development Site. An 80 acre property located on the northwest corner of the junction of Highways 37 and 23. This development is expected to include high density housing, hotel, convenience store, and restaurant. The City is currently extending sewer services to this site. Existing Homes and Businesses. There are several homes and business located in this area designated on the project map. One business has recently been sold and demolished to make way for new construction of a lounge. City of Parshall Infrastructure Needs Assessment 5

6 POTABLE WATER SYSTEM ASSESSMENT AND IMPROVEMENT RECOMMENDATIONS Water System Demands The City s water treatment facility provides drinking water for the City, Fort Berthold Rural Water, and non-reservation rural water users. The peak water supply agreed to be provided to non-city users is 1,150 gallons per minute (gpm) or million gallons per day (gpd). The City completed a Preliminary Engineering Report on the Water Treatment Facility and Raw Water Intake System Improvements in In the report, the City s historical water demands were analyzed and a planning value for average day demand was determined to be 150 gallons per capita per day (gpcd). As the City grows and annexes new areas into the City, Fort Berthold Rural Water will provide the water to the annexed areas based on available water capacity. While the near-term population projection is 4,000, the City will provide water to an estimated maximum 1,500 people and the remaining 2,500 people will be served by Fort Berthold Rural Water. Based on serving an estimated 1,500 people and an average day domestic water demand of 150 gpcd, the estimated water demand is 225,000 gpd, or 156 gpm. The maximum peak day water demand is estimated by applying a peaking factor to the average day demand. Based on the climatic conditions of the Parshall region, a peak day demand factor of 3.3 is applied. This peaking factor is derived from the 2008 Water Treatment Facility and Raw Water Intake System Improvements Preliminary Engineering Report. The 3.3 peaking factor applied to the projected daily water demand results in an estimated maximum day water usage of 743,500 gpd, or 516 gpm. The planned peak water demand for the City with respect to the new water treatment facility is 650 gpm which includes domestic demands and water for bulk water sales. Fire flows are commonly defined by the local Fire Protection Authority Having Jurisdiction (FPAHJ). When there are no local standards, Annex H of the Uniform Fire Code (UFC) indicates residential areas should have access to 1,000 gallons per minute (gpm) flow for one hour, or 60,000 gallons for fire protection. The UFC also indicates the minimum fire flow for commercial structures is 1,500 gpm with two hour duration. Many rural communities, including Parshall, have distribution lines six inches in diameter or smaller which cannot adequately convey a 1,500 gpm. Instead, many rural communities adopt a flow of 1,000 gpm for a two hour duration (120,000 gallons) as a fire flow standard (based on small pipe diameter and relatively few commercial buildings). Without providing water service to newly annexed areas of the City, these areas will also not be provided fire protection from the City. The City has fire flow storage and relies on the Rural Fire Department for fire response and protection. City of Parshall Infrastructure Needs Assessment 6

7 Water Supply Description The City s Water Treatment Facility utilizes surface water from Lake Sakakawea. Construction of the new water intake approximately 17 miles southwest of the City will be completed in The intake has two pumps with a capacity of 2,250 gpm each. The City s water wells are accessible but are only intended to be utilized in an emergency due to poor water quality. Ten-State Standards requires a public water system to be able to meet its maximum day demand with the largest pump out of service. The maximum day water demand is estimated at 2.59 million gallons or 1,800 gpm for the City, Fort Berthold Rural Water, and other rural water users. Each pump can produce 2,250 gpm, so the City meets the Ten-State Standards for water supply. The City has a permit for 2,000 acre-feet per year from Lake Sakakawea which serves the City, Fort Berthold Rural Water, and other rural water services with drinking water. The City also has an industrial water permit for 1,000 acre-feet per year from Lake Sakakawea for a combined total water volume of 3,000 acre-feet, or 2.67 million gallons. Water Treatment Description The City s new water treatment facility is under construction on the banks of Lake Sakakawea. The City currently is utilizing both the new treatment facility, and the existing lime softening water treatment facility (while constructing the membrane water treatment facility). Both water facilities are capable of treating water to meet North Dakota Department of Health (NDDH) drinking water standards. The new 1,800 gpm membrane water treatment facility will provide peak demands of 650 gpm to the City, 750 gpm to Fort Berthold Rural Water, and 400 gpm to rural water users located off the Fort Berthold Indian Reservation. There are no current water quality issues. Water Distribution and Storage Description In 1985, the City replaced the entire water distribution system with PVC pipe. The City s distribution pipes range in size from six to 12 inches, and are adequate to provide fire flow to fire hydrants. The distribution system issues are primarily related to the inoperable and malfunctioning gate valves. The City s 500,000 gallon ground storage reservoir was constructed in the 1960s. It has been well maintained and is reported to be in good condition. With anticipated water storage requirements of 120,000 gallons for fire flows and 225,000 gallons for domestic use, the total storage required is 345,000. The City s existing 500,000 gallon reservoir should be adequate to serve the City s anticipated future needs. City of Parshall Infrastructure Needs Assessment 7

8 The City recently installed radio read water meters and has upgraded the main bulk water sales station with a new billing system. The present monthly water rates for residential accounts are $26.00, plus $2.10/kgal. Accounts with a one inch or larger water connections are charged a base fee of $ per month, plus $3.00/kgal. The City has a balance of $2.9 million in outstanding long-term debt on the water system infrastructure. Water Supply, Distribution, and Storage System Improvement Recommendations With water distribution system improvements completed in the 1980 s, and a new water treatment facility currently under construction, the only deficiency identified with the water system is the need to replace gate valves. A cost opinion for the replacement of 20 gate valves is provided in Table 2. Associated street repair is not included in the gate valve replacement cost opinion as this project should coincide with future street improvement projects to reduce total project costs. This is further addressed in the street assessment later in this report. # DESCRIPTION QTY UNIT TOTAL 1 Gate Valve 20 Each $ 34,000 2 Pavement sawcut and removal 480 SY $ 8,000 3 Excavation 400 CY $ 3,000 4 Fittings 1 LS $ 4,000 Direct Construction Subtotal $ 49,000 General Conditions 8% $ 3,920 Contingency 15% $ 7,350 Construction Subtotal (2012 dollars) $ 60, Construction Cost % $ 64,065 Engineering 20% $ 12,054 Legal & Administrative 5% $ 3,014 TOTAL 2 $ 80,000 1 The ENR 20 year average Construction Cost Index is +3.1% (as of November 2009), so capital costs are projected to an anticipated construction date in 2014 using an annual 3.1% inflation rate. 2 Value rounded up to nearest thousand TABLE 2 OPINION OF PROBABLE COST WATER SYSTEM IMPROVEMENTS GATE VALVE REPLACEMENT City of Parshall Infrastructure Needs Assessment 8

9 WASTEWATER SYSTEM ASSESSMENT AND IMPROVEMENT RECOMMENDATIONS Existing System Description The City s wastewater system consists of a collection system and master lift station that conveys wastewater to a lagoon treatment system southwest of town. The lagoon is a three-cell system with two primary ponds and one secondary pond. System Loading Based on a population of 4,000 people and 100 gpcd for new collection systems, the average domestic wastewater flows are estimated at 400,000 gpd (278 gpm). The future peak hour factor is assumed at 5.0, which is typical for small communities in this region. The peak flow is estimated to be 1,389 gpm. Collection System Existing Conditions and Deficiencies The sewer system was originally constructed of clay tile pipe in the 1940s, and has had maintenance issues for years. With revenue from bulk industrial water sales, the City is replacing the trunk lines of the sewer system in 2012 and has a multi-year replacement plan for all of the sewer system with eight, ten, and 12 inch PVC pipe, which will be sufficient in size for future peak flows beyond 1,388 gpm. The City s master lift station was installed in the 1980s and conveys City water to the lagoons. The lift station is being replaced with a new lift station in Treatment System Existing Conditions and Deficiencies The existing lagoon system is located southwest of the City and consists of three cells with two primary ponds and one secondary pond. The City has discharged from the ponds only a few times, and no solids have been removed during the life of the treatment system. The lagoons are designed to have a maximum water depth of six feet and a minimum two feet of water must be maintained in the pond at all times. The bottom two feet of pond area is typically reserved for sludge and solids accumulation. The NDDH requires two to three feet of freeboard from the top of the berm to the water level. The surface area of the primary ponds is 7.7 acres, and 3.9 acres, respectively, and the available combined storage is million gallons. The surface area of the secondary pond is 4.65 acres, and the available storage is 1.38 million gallons. According to a USGS Evaporation Study, evaporation in this area occurs at an average rate of approximately 28 inches per year. A weather gauging station in Minot, North Dakota indicates the average annual precipitation is 17.2 inches per year. Net evaporation is estimated as 10.8 inches per year and the estimated evaporation from the lagoon per year is 4.76 million gallons. Evaporation occurs predominately in the summer, so little benefit is realized from evaporation in the winter City of Parshall Infrastructure Needs Assessment 9

10 months. The North Dakota Department of Health (NDDH) regulations indicate a seepage limit of 1/8- inch per day. Based upon the current wastewater flows, evaporation, and allowable seepage, the ponds should be full, on average, every 68 days. NDDH regulations do not allow for rapid infiltration as a means of disposing of wastewater, but permit treated effluent to be discharged to a surface body or drainage. Because the ponds are rarely discharged, it appears the City s wastewater system seeps effluent to groundwater. In order to reduce seepage to within the allowable limit of 1/8-inch per day, the lagoons should be lined. The design criteria for treatment systems in North Dakota are based on the primary lagoon five-day biological oxygen demand (BOD) loading rate, the total system BOD loading rate, and a minimum requirement of 180-days of storage volume. All three criteria should be met for successful wastewater treatment. The primary lagoons currently have the capacity to serve a population of 1,960 at a BOD loading rate of 0.18 pounds per population equivalent. The total lagoon system has the capacity to serve a population of 1,800 (at a BOD loading rate of 0.18 pounds per population equivalent), and the lagoon system can store 180 days of flows for a population of 700. The lagoon system needs to serve the planning population of 4,000 with adequate surface area for the BOD load and adequate volume to store 180 days of average wastewater flows. These three evaluation criteria, existing conditions, and minimum recommended improvements are summarized in Table 3. TABLE 3 WASTEWATER TREATMENT REQUIREMENTS EXISTING CAPACITY AT EXISTING SYSTEM FUTURE FLOW/LOAD DESIGN CRITERIA Hydraulic Retention 31 days storage at 400, days storage capacity gpd (minimum) Primary Cell BOD 62 ppd BOD per acre with 30 ppd BOD per acre Loading 11.6 acres (maximum) Overall BOD Loading 44.3 ppd BOD per acre 20 ppd BOD per acre with acres (maximum) MINIMUM RECOMMENDED IMPROVEMENTS Add 59.3 million gallons storage Add 12.4 acres of primary area to increase to 24 acres Add acres of total area to increase to 36 acres The present wastewater rate is a flat fee of $7.50 per month. Before 2012, the City did not have debt on its wastewater system. In 2012, the City secured $1.8 million in debt to support wastewater infrastructure improvements. Revenue from bulk industrial water sales will support the repayment of this debt. City of Parshall Infrastructure Needs Assessment 10

11 Wastewater Collection and Treatment System Improvement Recommendations In 2012, the City will complete approximately 17 percent of the collection system replacement, with plans to replace the entire collection system in the near future. Completion of the rest of the project includes removal and replacement of eight-inch sanitary sewer, asphalt pavement removal, excavation, new manholes, and new sewer service connections. Street repair is not included in the costs as these costs will be address in the street assessment within this report. AE2S provided the City quantities for this project in January 2011, and the quantities were updated for this report. Costs reflect values taken from recent bid tabs on the City s collection system projects in 2012 and indexed to In April of 2012, AE2S presented the City with a Wastewater Treatment Facility Plan. The Facility Plan provides a phased approach to wastewater treatment expansion, with Phase I designed to serve a population of 5,000 people, and Phase II designed to serve a population of 9,950 people. The master lift station was replaced in 2012 to serve the same population. A 160-acre parcel located south of the current wastewater treatment ponds has been identified as a possible area for expansion of the wastewater treatment facility. The Wastewater Treatment Facility Plan Phase I includes transitioning the three existing lagoons to serve as primary cells, which would provide acres of lagoon surface area. An additional acre primary lagoon should be constructed south of the existing ponds across Shell Creek. Together, this will provide a total of 30 acres of primary lagoon water surface area. A new secondary cell would provide the necessary 180 day storage volume, with a surface area of 38 acres. The total volume of the lagoon system after the Phase I expansion will be 90 million gallons, to serve a population up to 5,000 people. With new cell construction across Shell Creek from the existing lagoon system, a transfer pump station should be installed at the existing lagoon site. The transfer station should include two pumps, each capable of transferring the planned peak day demand. Also recommended within the Wastewater Treatment Facility Plan is dredging of the existing lagoons, and placement of a synthetic or clay liner to prevent seepage beyond the allowable 1/8 inch limit. A cost opinion for collection system improvements, including expansion and rehabilitation of the wastewater treatment system, is provided in Table 4. City of Parshall Infrastructure Needs Assessment 11

12 TABLE 4 OPINION OF PROBABLE COST WASTEWATER SYSTEM IMPROVEMENTS POND REHABILITATION # DESCRIPTION QTY UNIT TOTAL 1 8-inch sanitary sewer gravity main 25,700 LF $ 1,080,000 2 Remove asphalt pavement 151,300 SY $ 954,000 3 Sanitary sewer excavation 75,600 CY $ 756,000 4 Sanitary sewer manhole 60 EA $ 282,000 5 Sanitary sewer service connections 400 EA $ 300,000 6 Treatment Cells 1 LS $ 2,124, inch gravity piping 1 LS $ 188,000 8 Transfer station, electrical, and controls 1 LS $ 423,000 Direct Construction Subtotal $ 6,107,000 General Conditions 8% $ 488,560 Contingency Construction Subtotal (2012 dollars) 20% $ 1,221,400 $ 7,816, Construction Cost 1 3.1% $ 8,309,124 Land Purchase 55 acres at $12,000/acre $ 660,000 Engineering 20% $ 1,563,392 Legal & Administrative 5% $ 390,848 TOTAL 2 $ 10,924,000 1 The ENR 20 year average Construction Cost Index is +3.1% (as of November 2009), so capital costs are projected to an anticipated construction date in 2014 using an annual 3.1% inflation rate. 2 Estimate rounded up to nearest thousand STREET AND STORMWATER SYSTEM ASSESSMENT AND RECOMMENDED IMPROVEMENTS Street and Stormwater System Assessment The City s street system consists of paved streets and gravel alleyways. The streets also have curb, gutter, and valley gutters to convey stormwater. The original paved streets were installed in 1962 with some maintenance over the past five decades. The last chip seal was completed in the early 1990s. There has been no further rehabilitation due to the City s financial constraints. The City operates a bulk water fill station which serves more than 125 industrial trucks per day. The streets are currently in very poor condition, and the design for the planned improvements needs to accommodate the heavy industrial traffic now utilizing the City streets. Before 2012, the City did not have debt on its street City of Parshall Infrastructure Needs Assessment 12

13 system. In 2012, the City secured $4.15 million in debt to support street infrastructure improvements. Revenue from bulk industrial water sales will support the repayment of this debt. Street and Stormwater System Improvement Recommendations All of the streets within the City require improvements due to the poor existing condition of the streets and heavy industrial truck traffic. With the sewer system replacement project, the City is also involved in a multi-year street replacement project which will also include curb, gutter, and valley gutter replacement. In 2012, the City will complete approximately 17 percent of the street replacement project. Completion of the street replacement project includes 12 inches of Class 5 aggregate, geotextile fabric, six inches of bituminous asphalt, removal and replacement of concrete curb and gutters, and hydroseeding. AE2S provided the City the quantities for this project in January 2011, and costs have been updated for this report. Costs reflect recent bid tabulations on the City s 2012 street improvement project, and are indexed to A cost opinion for the remaining street improvements project is provided in Table 5. CONCLUSIONS The City has taken a proactive approach to addressing the oil impacts in the area. Bulk industrial water sales have been established to provide a new revenue stream to improve the City s infrastructure. The City has studied and assessed the current conditions and prioritized its required infrastructure improvements. While improvements to the drinking water supply and the wastewater collection system have been completed, the City has deficiencies in the water distribution system, wastewater collection and treatment systems, and the streets and stormwater system. To support a projected population of 4,000 people, the City will need to construct approximately $27.7 million in water, wastewater, and street infrastructure improvements. City of Parshall Infrastructure Needs Assessment 13

14 TABLE 5 OPINION OF PROBABLE COST STREET IMPROVEMENTS # DESCRIPTION QTY UNIT TOTAL 1 12-inch aggregate base (Class 5) 151,300 SY $ 1,816,000 2 Geotextile fabric 151,300 SY $ 417, " Asphalt 150,400 SY $ 6,016,000 4 Alley pavement 990 SY $ 35,000 5 Concrete curb and gutter 66,000 LF $ 1,320,000 6 Remove curb and gutter 66,000 LF $ 264,000 7 Hydroseeding 36,700 SY $ 59,000 8 SWPPP Implementation and Maintenance 1 LS $ 44,000 Direct Construction Subtotal $ 9,971,000 General Conditions 8% $ 797,680 Contingency Construction Subtotal (2012 dollars) 20% $ 1,994,200 $ 12,762, Construction Cost % $ 13,566,444 Engineering 20% $ 2,552,576 Legal & Administrative 5% $ 638,144 TOTAL 2 $ 16,758,000 1 The ENR 20 year average Construction Cost Index is +3.1% (as of November 2009), so capital costs are projected to an anticipated construction date in 2014 using an annual 3.1% inflation rate. 2 Estimate rounded up to nearest thousand The work that provided the basis for this publication was supported by funding under an award with the U.S. Department of Housing and Urban Development. The substance and findings of the work are dedicated to the public. The author and publisher are solely responsible for the accuracy of the statements and interpretations contained in this publication. Such interpretations do not necessarily reflect the views of the Government. City of Parshall Infrastructure Needs Assessment 14