Dardanelle Collection Wells
LOCATION
Dardanelle, AR
SCOPE OF WORK
SWPPP, Design of Municipal Radial Collector Well
CLIENT
Carl Cross, Public Works
Director
City of Dardanelle
PO Box 360
Dardanelle, AR 72834
(479) 229.4500
Collector Well #1
In 2009, MCE was commissioned to perform all permitting and design for the construction of a new collector well.
In order to comply with the sanitary buffer requirements, the collector well needed to be considered a groundwater well, under the influence of surface water. In this case special setbacks applied but to a lesser degree than the surface intake. The city already owned a portion of the sanitary buffer required and for the remainder, a 100-year lease was obtained.
The collector well is a 13 foot diameter well, a 60 foot deep cassion with six radial 12 inch diameter screens totaling 1,175 linear feet. The well is equipped with three 75 hp motors capable of pumping 5.0 MGD.
Collector Well #2
The City of Dardanelle currently relies upon one collector well and seven vertical wells for its water supply. The majority of the vertical wells are at an age where maintenance is becoming continuous and replacements are imminent. In 2018 MCE began to identify a site acceptable to the City and the ADH for a potential second collector well. A specific site has been selected that is acceptable to the ADH favorable water quality testing.
The only permitting anticipated is through the ADH and ADEQ. The water quality sampling is anticipated for a duration of 12 months. This project was suspended in 2019 as changes in management developed.
Raw Water Collection Well
LOCATION
Dardanelle, AR
SCOPE OF WORK
Engineering Design
CLIENT
Jerry Dawson, Water Super.
City of Dardanelle
PO Box 360
Dardanelle, AR 72834
(501) 229.3992
MCE worked with the City of Dardanelle in the design of a new municipal radial collector well. The collector well is the first well of its type for municipal use in Arkansas, though wells of this sort have been in use worldwide for some time. This volume of water will enable the city to discontinue the use of conventional water wells. The new well, located 100 feet from the Arkansas River, is in Veteran’s Park. This location enabled the City to obtain reduced sanitary buffer area requirements as compared to more extensive buffer requirements for river intake from the Arkansas Department of Health. Construction began in October 2009 and was completed in July 2010. Initial indications were that the wells water quality is superior to that of the Arkansas River based on the influence of local groundwater and filtration and possible biological treatment of the river water within the aquifer sand. The well is expected to produce at least three million gallons per day and cost approximately $2 million.
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Wastewater Treatment PlantExpansion
LOCATION
Decatur, AR
SCOPE OF WORK
Engineering Design, Survey, Geotechnical Investigation, Construction Observation/ Administration, Construction Materials Testing
CLIENT
James Boston, Public Works
Director, City of Decatur
PO Box 247
Decatur, AR 72722
(479) 752.3912
MCE designed the City’s current WWTP which had a design capacity of 2.2 MGD and included screening and grit headworks equipment, a sequencing batch reactor treatment system, effluent filters and a UV disinfection system. Construction of the WWTP was completed 2010 at a total cost of $8.4 million, and this project was named Small System of the Year for 2010 by the Northwest Arkansas District of the Arkansas Water Works and Water Environment Association.
In 2015, the City began accepting wastewater from the City of Centerton for treatment, which prompted Decatur to begin evaluating options to expand the WWTP in order to handle the projected increase in flows and to meet the discharge permit limits. In late 2015, the City selected a design-build team consisting of Crossland Heavy Contractors and MCE to design and construct the necessary improvements.
The improvements consisted of retrofitting the existing SBR treatment process to a membrane bioreactor treatment process, which increased the design capacity from 2.2 MGD to 3.8 MGD (interim) and 4.6 MGD (ultimate) without increasing the footprint of the WWTP. This progressive design-build project included the replacement of influent pumps; installation of rotary drum screens; membrane tanks, pumps, and piping; permeate pumps, tank and piping, new UV disinfection equipment; and new sludge press.
As part of this project, MCE performed an evaluation on the fine screening requirements in order for the MBR process to properly operate. MCE selected two 1.5-mm rotary drum screens to operate in parallel. Each screen has a design capacity of 5.4 MGD to allow for redundancy. The screens were installed on top of the existing anaerobic tanks which resulted in nearly $0.5M in cost savings, compared to installing them upstream of the influent pump station.
The conversion from the SBR to MBR treatment process was completed in January 2019, and construction was substantially complete in March 2019. The total construction cost of this project was approximately $9 million.
This project won the 2020 ACEC Engineering Excellence Award;Category F: Water and Wastewater; Honor Award.
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New Water Treatment Plant
LOCATION
Mountain View, AR
SCOPE OF WORK
Design of a 3.0 MGD Surface Water Treatment Plant
CLIENT
Keith Johnson, Water
Superintendent, City of Mountain View
PO Box 360
Mountain View, AR 72560
(870) 269.3804
MCE designed a new water treatment plant that includes flocculation, sedimentation, filtration and disinfection systems. The project also included a new raw water intake system located on the White River. The raw water system pumps against 400 feet of head to deliver water to the plant. MCE also included a SCADA system as well as an 18-inch transmission line from the plant to the City of Mountain View. MCE also expanded the capacity of the plant from 3.0 MGD to 5.0 MGD as well as made raw water intake improvements. MCE also be provided an additional elevated storage along with a booster pumping facility.
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Pump Station 15 Rehabilitation & Screen
LOCATION
Pine Bluff, AR
SCOPE OF WORK
Survey, Engineering Design, Project Administration
CLIENT
David Poe, Pine Bluff
Wastewater Utility
200 C 18th Avenue
Pine Bluff, AR 71601
(870) 535.6603
MCE was contracted by Saracen Development, LLC to rehabilitate the existing Pine Bluff Wastewater Pump Station #15. The existing pump station consisted of two KSB 22.5 hp submersible pumps in a 16-foot diameter x 30-foot-deep wet well. The rehabilitation included replacing two KSB 22.5 horsepower submersible pumps with three Flygt 45 hp submersible pump and included a magmeter installation on the effluent force main. In addition to the pump replacement, MCE designed a new influent bar screen and channel. These upgrades were required to provide service to the new Saracen Casino and Resort development which will increase the flow rate by 200-gallonsper-minute to the existing Pine Bluff Wastewater System. A screen was required to protect the newly installed pumps from any foreign objects that might be brought in from the existing system and the new development.
Additionally, PBWU had recently completed the construction of a new sanitary sewer storm pump station that uses the same force main as the rehabilitated #15 pump station. The new pumps had to be capable of handling many different head conditions while maintaining firm flow and utilizing the existing force main. This was achieved by the triplex setup. Many challenges were faced throughout the design and construction concerning site constraints; depth, soil condition dewatering, and bypass pumping.
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