Water Treatment for Cedar Gulch 2

CEE 465 Capstone II

April 28, 2016

Deidre Beck, Deryn Beck, Luis Duque,

Jessica Lemmerman, and Mitchell Shearer

WATER SYSTEMS, INC. Brookings, SD

Project Background

Alternatives Analysis

Final Design

Acknowledgements

Presentation

Sioux Falls

Brookings

Rapid City

Pierre

Interstate 90

| 50 miles |

Pennington County

1 Mile

Interstate 90

Rapid City

Cedar Gulch 2

Rapid City Regional Airport

Project Background

Community Corps Project

Northern Virginia Professional

Chapter of Engineers Without

Borders USA (EWB-NOVA)

Drinking Water Issues

Water quality

Water storage

Water rights

Deep Well

Bra

dsk

yR

oad

Cedar Gulch 2

Well

DistributionSystem

Two 80 GallonWater Storage

Tanks

ChlorineFeed

System

Existing Water System

Water Quality

ParameterCG2 Well

(pCi/L)MCL

(pCi/L)

Gross Alpha 61.4 15

Radium 226 25.2 5

Radium 228 5.5 5

Water Quality

Consideration Ion Exchange Reverse Osmosis

Radium Removal Good Good

Gross Alpha Removal Adequate Good

Cost of Operation Low High

Ease of Operation Low High

Waste Stream Small Large

Water Rights

2 Options:

New Well

Buy Rights

No action

Population - 40 residents

Water Usage for Community

Includes:

Emergency needs

Irrigation and other outside usage

Does not include

Fire protection

Design Water Demand - 100 gpd/capita

Design Water Storage - 3,000 gallons

Design Water Demand

Description Water Demand (gpd)

ADD (Average Day Demand)

4,000

MDD (Max Day Demand)

12,000

PHD (Peak Hour Demand)

16,000

Design Water Demand

Alternative 1: Point of Entry (POE)

Alternative 2: Centralized Treatment

Alternative 3: Connection to City Water

Alternatives

Proposed Centralized Treatment Site

Deep Well

Bra

dsk

yR

oad

Life-Cycle Cost Analysis

Alternative Present Worth Cost

Point of Entry $258 Thousand

Centralized Treatment $326 Thousand

Connect to City Water $2.2 Million

Alternatives Analysis Matrix

Rank Consideration Weight

1 Cost 40%

2 Timeline 20%

3 Water Storage 15%

4 Water Rights 15%

5 Water District Responsibility 10%

Alternatives Analysis

Alternatives were ranked 1-3 with 3 being the best

Consideration Weight POE Centralized City Water

Cost 40% 3 2 1

Timeline 20% 3 2 1

Water Storage 15% 2 2 3

Water Rights 15% 1 1 3

Water District Responsibility

10% 1 1 3

Score 100% 2.35 1.75 1.80

Recommendation

Point of Entry

Individual Ion Exchange

Treatment (Water Softener) +

Additional Community Storage

Lowest Cost

Quick implementation

Improved Community Storage

Final Design: Centralized Treatment

Plan View

Ion exchange

Ion exchange

WRT Z88 Portable Exchange System (PES)

20 gpm

Radium removal 30 pCi/L to below 5 pCi/L

Gross alpha removal equivalent to Ra-226 removal

$49,500 + engineering and installation

$43,000 Media Exchange Service @ 3.8 million gallons (~3 years)

Chlorine System

Chlorine System

Liquid Chlorine (NaOCl)

8.25% conc. by weight

2 pumps( 1 is backup)

Storage Tank for Chlorine

15 gallon, doubled walled

Chlorine delivered every 14 days

$690 + engineering, installation and maintenance

Retention Tank

Retention Tank

WG23_watercat Water Retention Tank

Capacity: 300 gallon

Non-pressurized

Dimensions of Retention Tank:

Diameter – 46"

Height– 49.5"

$310 + engineering and installation

Storage Tank

Storage Tank

3,000-gallon HydropneumaticWater Storage Tank

Design Pressure: 100psi

Operating Pressure: 65-75 psi

Dimensions of Storage Tank:

Diameter – 60"

Length – 23'

$20,000 + engineering and installation

Foundation Structure

Cross sections

Column

Footing

Cost EstimateItem Description Unit Cost per Unit Quanitity Cost

1 Mobilization LS $ 5,250.00 1 $ 5,250.00

2WRT Ion Exchange System (25 gpm) LS $ 49,500.00 1 $ 49,500.00

3 Retention Tank LS $ 310.00 1 $ 310.00

4 Chlorine System LS $ 690.00 1 $ 690.00

5Hydroneumatic Storage Tank LS $ 20,000.00 1 $ 20,000.00

63" Schedule 40 PVC Pipe and Fittings FT $ 13.26 50 $ 663.00

7 Reinforced Concrete CU YD $ 100.00 30 $ 3,000.00

8 Prefabricated Building LS $ 5,000.00 1 $ 5,000.00

Subtotal 1 $ 84,413.00

Engineering/Installation (15%) $ 15,800.00

Contingency (5%) $ 5,250.00

Total $ 105,463.00

Dr. Kyungnan Min

EWB-NOVA

Bernard Krantz, PE, Bechtel National

Sara Schmieg, PE, Bechtel National Inc.

Jon Mulligan, EIT, The Engineering Groupe, Inc.

Catherine Eichel, EIT, Brown and Caldwell

Jim Jones, Midwest Assistance Program

Cedar Gulch 2 residents

Acknowledgements