Army report_final.pdf

Ohio Army National Guard Base Project NLGZ062005

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WATER AND SEWER CAPACITY STUDY

TABLE OF CONTENTS

Title Page No

1.0 EXECUTIVE SUMMARY 1

2.0 INTRODUCTION 3

2.1 Purpose 3

2.2 Scope of Work 3

3.0 EXISTING CONDITIONS 5

3.1 Historical Background 5

3.2 Existing Water Distribution System 5

3.2.1 Description 5

3.2.2 Present Water Use and Cost 5

3.2.3 Problems With Existing Water Distribution System 5

3.3 Existing Sanitary Sewer System 5

3.3.1 Description 5

3.3.2 Problems With Existing Sanitary Sewer System 6

3.4 Recent Studies of Sanitary Sewer System 6

3.4.1 Sewer System Evaluation (Zande) 6

3.4.2 CCTV Work by AETC Environmental, Inc. 6

3.4.3 I/I Study by URS Corporation 6

3.4.4 Studies by M. S. Consultants 7

3.5 Jurisdiction for Water Supply and Sewerage 7

4.0 DESIGN POPULATION 8

4.1 Design Period 8

4.2 Existing Facilities and Population 8

4.2.1 Base Population During Regular Working Days 8

and During Drill Weekend

4.3 Short Range Phase (2010-2015) 9

5.0 FIXTURE UNIT COUNT 10

5.1 Flow Determination 10

6.0 WATER SYSTEM 11

6.1 Domestic Water Use 11

6.1.1 Design Criteria ` 11

6.1.2 Effective Population 11

6.1.3 Capacity Factor 11

6.1.4 Design Population 12

6.1.5 Daily Demand 12

6.2 Fire Flow Protection Requirements 12

6.2.1 Fire Flow Requirements for Buildings 13

6.2.2 Fire Fighting Duration 13

6.2.3 Fire Flow Demand 13

6.2.4 Total Water Demand 14

6.3 Peak Domestic Demand 14

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TABLE OF CONTENTS

(CONT.)

6.4 Design Water Demand Versus Actual Water Use 14

6.5 Proposed Water Distribution Improvement 15

6.5.1 Existing Water System Improvements 15

6.5.2 Future Water System Connections 16

6.6 Iron in the Water Distribution System 16

6.7 Modeling a New Water Distribution Loop 16

6.8 Estimated Costs 17

7.0 SANITARY SEWER SYSTEM 18

7.1 Quantity of Wastewater 18

7.2 General Design Criteria 18

7.3 City of Columbus, Division of Sewerage and Drainage 18

Design Criteria

7.3.1 Average Sanitary Wastewater Flow 18

7.3.2 Peak Sanitary Wastewater Flow 18

7.3.3 Infiltration and Inflow 19

7.3.4 Design Flow 19

7.3.5 Design Capacity 19

7.4 Pipe Size 19

7.5 Existing Sanitary Sewer Repairs/Replacement 20

7.6 Proposed Sanitary Improvements 20

7.7 Estimated Costs 20

8.0 CONSTRUCTION PHASING PLAN 21

9.0 ESTIMATED COSTS 22

10.0 20-YEAR LIFE CYCLE COSTS 24

10.1 Evaluation Period 24

10.2 Water System 24

10.2.1 Estimated Construction Costs 24

10.2.2 Estimated Annual Operations and 24

Maintenance (O&M) Costs

10.3 Sanitary Sewer System 27

10.3.1 Estimated Construction Costs 27

10.3.2 Estimated Annual Operations and 27

Maintenance (O&M) Costs

LIST OF FIGURES

Figure 3.1 Development Plan for Air National Guard Figure 6.1 Proposed Waterline Improvement Plan Figure 6.2 Water System Loop Concept Design Figure 7.1 Proposed Sanitary Sewer Improvement Plan Figure 10.1 Water Use Costs Over 20 years Figure 10.2 Water System Maintenance Costs Over 20 Years

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LIST OF FIGURES

(CONT.)

Figure 10.3 Sanitary Sewer Charges Over 20 Years Figure 10.4 Sanitary Sewer Maintenance Costs Over 20 Years

LIST OF TABLES

Table 4.1 Present (2006) Base Population Table 5.1 Building Fixture Unit Counts Table 6.1 Present (2006) Total Water Demand Table 6.2 Short Range Phase (2010-2015) Water Demand Table 6.3 Present (2006) Fire Flow Demand Table 6.4 Short-Range Phase (2010-2015) Fire Flow Demand Table 6.5 Actual Water Use Table 6.6 TRANSITE Waterline Replacement Costs Table 7.1 Present (2006) Sanitary Flow Table 7.2 Short Range Phase (2005-2010) Sanitary Flow Table 7.3 Sanitary Sewer Rehabilitation Costs Table 9.1 Summary of Estimated Improvement Costs Table 10.1 Water Use Costs Over 20 Years Table 10.2 Water System Maintenance Costs Over 20 Years Table 10.3 Sanitary Sewer Charges Over 20 Years Table 10.4 Sanitary Sewer Maintenance Costs Over 20 Years

APPENDICES

Appendix A A-E Statement of Work Appendix B Meeting Minutes Appendix C Summary of Water & Sewer Billings

Water and Sewer Capacity Study Type “A” Concept Design Ohio Army National Guard Project No. NLZG062005

1. EXECUTIVE SUMMARY

The Ohio Army National Guard (OHARNG), located at Rickenbacker International Airport, has contracted with Prime Engineering & Architecture, Inc. (PRIME) to perform a water and sewer system capacity study. The purpose of the study is to analyze the existing systems and ascertain their capacity to accept increased water consumption and sanitary flows during OHARNG’s proposed expansion over the next 10 years. In the process of planning for future growth and expansion at OHARNG, the Base found it necessary to understand the effect that such growth would have on the existing 60-year old existing sanitary and water systems.

PRIME’s goal in performing this study was to define the current system limitations and evaluate it for future expansion. The methodology included a review of Rickenbacker International Airport reports, of which OHARNG’s systems are part. The studies’ results yielded valuable information concerning current flow and supply capacities; understanding of problems with system operation; and knowledge of current system structural integrity.

In this report, PRIME studied and analyzed existing populations for water capacity and demand. This information was compared to the population forecast to determine if the existing systems could accommodate the growth. PRIME has determined that, with some system improvements and modifications, OHARNG’s existing sanitary sewer and water distribution system should be adequate to handle the proposed new construction and future population growth.

PRIME recommends the following repairs and improvements to the water and sanitary sewer systems at

OHANG:

• Replace approximately 6,000 feet of asbestos cemente (TRANSITE) water pipe

• Rehabilitate the existing sanitary sewer pipes with cure-in-place pipe (CIPP) lining

• Initiate a study of the iron problem in the water distribution system and investigate methods to eliminate high iron concentrations in the system.

The total estimated construction costs, including materials, labor, fees, engineering design and construction administration is $996,000. The required water tap and sewer charges imposed by the local regulatory agencies are summarized in Chapter 9.

Ohio Army National Guard Project No. NLZG062005

Construction phasing for both the water distribution system and sanitary sewer system should proceed as follows:

1. Replace 6,000 linear feet of TRANSITE water distribution system piping.

2. Rehabilitate the existing sanitary sewer pipes with CIPP lining.

3. Install the sanitary lateral as part of the site development phase for the new facility.

4. Install the water service tap as part of the site development phase for the new facility.

Ohio Army National Guard Project No. NLZG062005

2.0 INTRODUCTION

2.1 PURPOSE

The purpose of this study is to present a water and sewer capacity analysis and investigate improvements to the current water and sanitary sewer systems.

The Ohio Army National Guard (OHARNG) unit at Rickenbacker International Airport is in the process of analyzing its current and future water and sewer capacity needs. The OHANG has entered into a contract with Prime Engineering and Architecture, Inc. to perform this study. The anticipated population growth for OHANG will require new facilities to accommodate growth. As a result of this expansion and population growth, increased demands for domestic and industrial water needs, fire protection, and consequently, the need for modifications to the existing water distribution system or design of a new water distribution system are anticipated. The same anticipations are true for the sanitary sewer system.

2.2 SCOPE OF WORK

By Delivery Order No. 0061, dated July 18, 2006, The Ohio Army National Guard has authorized Prime

Engineering and Architecture, Inc. (PRIME) to provide investigative services for the capacity analysis and infrastructure upgrade of the water distribution and sanitary sewer system located on the Ohio Army

National Guard (OHARNG) cantonment area at Rickenbacker International Airport, Columbus, Ohio.

The Design Statement of Work requires PRIME to provide a report on options for improving the systems in accordance with base population, facility changes/improvement and mission profile for the following phase time lines:

1. Current: 0-5 years

2. Short Range: 5-10 years

The study results will be based on the following criteria:

• Population study for the Base and each Facility

• Current and proposed Building Fixture Count for each Facility

• Domestic and Fire Protection Requirements for each Facility

• Schematic Drawings for main, secondary, and lateral distribution systems

• Construction phasing plan with cost estimates

• Tap fees, capacity and other charges will be only required for Phase I (Current 0-5 years)

Ohio Army National Guard Project No. NLZG062005

PRIME is responsible for collecting, analyzing, and documenting information gathered from Federal, State, Local (city, county & municipal) authorities, Columbus Regional Airport Authority (CRAA) and other agencies as required to determine future growth in the area.

The OHARNG will provide drawings of the current water and sewer distribution systems, buildings, and any proposed future facilities changed. Current service is provided by Franklin County Sanitary Engineer through the City of Columbus Department of Public Utilities, Division of Water, Sewers & Drains.

Ohio Army National Guard Project No. NLZG062005

3.0 EXISTING CONDITIONS

3.1 HISTORICAL BACKGROUND

The Rickenbacker Air National Guard Base (RANGB) was opened in 1942 initially as the Lockbourne

Army Air Base, and later as Rickenbacker Air Force Base. In 1980, the Air Force closed the base, and subsequently the military operations were downsized considerably. Currently, a large portion of the land area of the former air force base is owned by Columbus Regional Airport Authority (CRAA). OHARNG owns 159.84 acres of the land.

3.2 EXISTING WATER DISTRIBUTION SYSTEM

3.2.1 DESCRIPTION

The existing water distribution system consists of a network of 8” and 10” pipes of ductile iron and

TRANSITE (asbestos cement) materials. Many appurtenances such as valves are not working properly and leak due to age. Based on the information gathered from the Franklin County Sanitary Engineer and the City of Columbus Water Department, waterline delivery pressure to the RANGB is 72 psi, according to the latest pressure tests. Figure 3.1 shows the existing water distribution system.

3.2.2 PRESENT WATER USE AND COST

Present water demand and usage costs were derived from the Water Summary Report – Account Review covering the period June 2003 to June 2006. Total water usage was found to be 5,229,850 gallons, or

7,008 ccf. The total usage cost for this period was $44,845.60, or $6.40 per ccf.

3.2.3 PROBLEMS WITH EXISTING WATER DISTRIBUTION SYSTEM

• TRANSITE pipes. City of Columbus Division of Water discourages the use of TRANSITE pipes due to environmental considerations and other factors.

• Aged appurtenances

• Temporary/permanent repairs to the water line system that may not have been properly implemented could be causing pressure reduction in the system.

• Iron concentrations in the existing water system.

3.3 EXISTING SANITARY SEWER SYSTEM

3.3.1 DESCRIPTION

The existing sanitary sewer is comprised of a network of 8-inch and 10-inch sewers. The major part of the system was constructed in the 1940’s. The system is beset with infiltration/inflow (I/I) problems. Age

Ohio Army National Guard Project No. NLZG062005 of the system is one of the major causes for the infiltration/inflow. Total flow from the existing system is collected at the main pumping station, located north of the OHANG cantonment, then pumped to a 15-inch trunk line in the Air National Guard cantonment, and gravity feeds to the CRAA system. Figure 3.1 shows the existing sanitary sewer system at OHARNG.

3.3.2 PROBLEMS WITH EXISTING SANITARY SEWER SYSTEM

• Cracked, broken, or aging pipes

• Infiltration and Inflow

3.4 RECENT STUDIES OF SANITARY SEWER SYSTEM

3.4.1 SEWER SYSTEM EVALUATION BY R.D. ZANDE AND ASSOCIATES, INC.

A sewer system evaluation was conducted by R.D. Zande and Associates (Zande) from May 1993 through September 1993 for a study area that included the entire former Rickenbacker Air Force Base and the Village of Lockbourne. The results were documented by Zande in a 1994 report to the Franklin

County Sanitary Engineer.

The Zande report indicated that the sanitary sewers in the study area exhibited excessive I/I amounting to at least twice the average daily dry weather sanitary sewer flow. This is due to numerous system defects as identified in the report, including possible cross connections to the storm sewer system. The Zande report recommended elimination of the existing excessive I/I. It was also suggested that the necessary modifications to the sewer system be sized to limit I/I to a value that is allowable by the City of

Columbus design criteria.

3.4.2 CCTV WORK PERFORMED BY AETC ENVIRONMENTAL, INC.

AETC Environmental, Inc. performed closed-circuit televising (CCTV) of the existing sanitary sewer system throughout the RANGB, and the OHARNG area, in 1997. The CCTV results indicated deteriorated segments, broken pipes, and sources of I/I.

3.4.3 I/I STUDY BY URS CORPORATION

In March, 2002, URS Corporation performed an I/I analysis of sanitary sewer CCTV tapes from the

Rickenbacker Airport area for the Franklin County Sanitary Engineer. The OHARNG cantonment was included in this analysis. The analysis results showed deteriorated pipe joints, numerous areas of probable infiltration, offset joints, and medium to heavy deposits in the pipe segments.

Ohio Army National Guard Project No. NLZG062005

3.4.4 SEWER SYSTEM STUDIES BY MS CONSULTANTS, INC.

A Water and Sanitary Sewer System Development Master Plan is being currently developed by MS

Consultants, Inc. This Plan addresses the future development of the Rickenbacker International Airport

Area (RIAA), of which the OHARNG is a part.

The study recommends the following:

• eliminating as many of the lift stations and sanitary force mains as possible in the RIAA, and replacing them with new gravity sanitary sewers.

• installing larger capacity water distribution lines in the RIAA.

The study addresses future development for commercial, industrial, and warehouse type facilities.

3.5 JURISDICTION FOR WATER SUPPLY AND SEWERAGE

Currently, the Franklin County Engineer’s Office is responsible for the respective water and sewer service areas. The City of Columbus may assume the responsibility for maintenance of both the sewers and water lines of the cantonment in the future.

Ohio Army National Guard Project No. NLZG062005

4.0 DESIGN POPULATION

4.1 DESIGN PERIOD

The design period for this study is five (5) years from 2010 through 2015.

4.2 EXISTING FACILITIES AND POPULATION

4.2.1 BASE POPULATION DURING REGULAR WORKING HOURS AND DURING DRILL

EVENTS

In accordance with information obtained from the State of Ohio-Adjutant General’s Department, Facilities Engineering, in June of 2006, there are 168 nonresident personnel and civilian employees working 8-hour shifts currently at the OHARNG. There are no resident military or civilian personnel or family housing. Once a month, during Drill weekend, base population peaks to 1,870 people. Table 4.1 presents a breakdown of the present population by each building.

TABLE 4.1 PRESENT (2006) BASE POPULATION

BUILDING

NUMBER BUILDING DESCRIPTION DAILY

POPULATION

UTA

MAXIMUM

POPULATION

946 WMD 22 22

945 JOINT USE FACILITY/BAND 1 88

944 DISTANCE LEARNING CENTER 1 40

943 ARMORY 18 46

941 IT BUILDING 2 2

933 ARMORY 6 51

931 437th Bn/ARMORY 28 490

930A RTI BARRACKS 0 200

930 RTI 16 300

922 C-26 HANGAR 6 30

920 ARMORY 12 168

918 HH-60 HANGAR 50 200

917 DINING FACILITY 3 1000*

915 ARMORY 3 233

TOTAL POPULATION 168 1,870

*The Dining Facility is a common area. The UTA populations are counted in the other building populations.

Ohio Army National Guard Project No. NLZG062005

4.3 SHORT RANGE PHASE (2010-2015) AND POPULATION

According to OHARNG personnel and the Facilities Engineering Office of the Ohio Adjutant General’s

Office, OHARNG plans to construct a new Readiness Center within the Short-Range time period. This new facility is expected to have a Drill weekend capacity of 400 people. This would increase the total drill weekend population to 2,270 people.

Ohio Army National Guard Project No. NLZG062005

5.0 FIXTURE UNIT COUNT

5.1 FLOW DETERMINATION

Building fixture unit counts in the various buildings were taken from the plans of the existing facilities and fixture count statements provided by the OHARNG Facilities Manager. Fixture counts are the number of plumbing fixtures, i.e., sinks, showers, toilets, etc., from which domestic water is used. A summary of these fixture counts by building is presented in Table 5.1.

Estimation of water use / wastewater flows based on fixture counts is not in the scope of work of this report and should be accomplished by a more comprehensive Water Management Plan for OHARNG.

Instead, the calculation of domestic wastewater flows in this report will be based on the methodology recommended by the City of Columbus, Division of Sewerage and Drainage.

TABLE 5.1 BUILDING FIXTURE UNIT COUNTS

NUMBER BUILDING DESCRIPTION

BUILDING

AREA

(SF)

BUILDING FIXTURE COUNT

WOMEN MEN UNISEX KITCHEN

946 WMD 9,048 8 10 2 0

945 JOINT TRAINING FACILITY/BAND 9,344 6 10 2 0

943 ARMORY 14,600 6 32 3 2

933 ARMORY 22,000 7 18 2 2

931 437th MP Bn 62,000 21 25 3 3

930 RTI 26,958 35 35 5 0

922 C-26 HANGAR 12,316 5 8 1 0

920 ARMORY 16,491 8 16 3 1

917 DINING FACILITY 13,665 6 6 0 14

918 HH-60 HANGAR 63,614 10 16 0 3

915 ARMORY 7,330 7 10 1 1

The Dining Facility is not counted in the base population figures. However, since drill personnel do use this facility, and since water is consumed and wastewater generated by those personnel, it is necessary to add the fixture counts and the corresponding water use to the OHARNG totals.

Plans for the future buildings are not prepared, therefore, it is not yet possible to project the future fixture counts.

Ohio Army National Guard Project No. NLZG062005

6.0. WATER SYSTEM

6.1 DOMESTIC WATER USE

6.1.1 DESIGN CRITERIA

For evaluation of the capacity of the water system, PRIME used the design criteria specified in “Joint

Departments of the Army and Air Force USA, Technical Manual TM 5-813-1/AFM 88-10, Volume 1, Water Supply, Sources and General Considerations, 4 June 1987”. These criteria require consideration of the following water system parameters for water systems at Army and Air Force installations:

• Effective Population

• Capacity Factor

• Design Population

• Required Daily Demand

• Fire Flow

• Peak Domestic Demand

• Total Water Demand

6.1.2 EFFECTIVE POPULATION

Normally, the effective design population is calculated by taking the resident population at the Base and adding to it an allowance for the nonresident population. However, at OHARNG, there is no resident population. Personnel assigned work eight-hour shifts and are, therefore, considered nonresident.

As shown in Table 4.1, the present daily population at OHARNG consists of 168 people. Once a month, during Drill weekend event, this population increases to 1,870. For this study, we will assume the UTA weekend event population as the effective design population.

Effective Population = Nonresident Population + Resident Population;

Effective Population = 1,870 + 0 = 1,870 people

6.1.3 CAPACITY FACTOR

Capacity factor is the multiplier applied to the effective population figure to allow for unforeseen factors such as population increases and variations in water demand, uncertainties as to actual water requirements, and unusual peak demands whose magnitude cannot be accurately estimated in advance.

The capacity factor varies inversely with the magnitude of the population in the water service area.

Capacity factors will not be applied when calculating fire flows, irrigation requirements, or industrial demands. Capacity factors, as a function of “effective population”, are shown in Table 3-1 of the

TABLE 6.1 PRESENT (2006) TOTAL WATER DEMAND

NUMBER BUILDING DESCRIPTION

AVERAGE NON-

RESIDENT DRILL

POPULATION IS

EQUAL TO

EFFECTIVE

POPULATION

AVERAGE

RESIDENT

POPULATION

DESIGN

POPULATION

SPECIAL

INDUSTRIAL

NEEDS

AIRCRAFT

WASH

(THREE

AIRCRAFT

PER WEEK)

IRRIGATION

NEEDS

AIR-

CONDITIONING

NEEDS

OTHER

DEMANDS

TOTAL

REQUIRED

DAILY

DEMAND

MAXIMUM

DAILY

DEMAND

(2.5 TIMES

REQUIRED

DAILY

DEMAND)

REQUIRED

FIRE FLOW

REQUIRED

FIRE FLOW

FOR 1 HOUR

FIRE FLOW

PLUS 50%

REQUIRED

DAILY

DEMAND

943 TROOP COMMAND/SECURITY FORCES 97 0 146 7275 0 0 0 0 7275 18187.50 1500 90,000 93,638 945 JOINT USE TRAINING FACILITY/BAND 88 0 132 6600 0 0 0 0 6600 16500.00 1500 90,000 93,300 931 437th Bn/ARMORY 490 0 735 36750 0 0 0 0 36750 91875.00 1500 90,000 108,375

930 RTI 300 0 450 22500 0 0 0 0 22500 56250.00 1500 90,000 101,250

922 AVN 168 0 252 12600 0 300 0 0 0 12900 32250.00 3000 180,000 186,450

918 AVN 233 0 350 17475 0 600 0 0 0 18075 45187.50 1500 90,000 99,038

946 WMD 0 0 0 0 0 0 0 0 0 0.00 1500 90,000 90,000

1376 0 2064 103,200 0 900 0 0 0 104,100 260,250 12,000 720,000 772,200

PEOPLE PEOPLE PEOPLE GPD GPD GDP GPD GPD GPD GPD GPD GPM GPH GPD

TOTAL

FIRE REQUIREMENTSDOMESTIC

REQUIREMENTSPRESENT (2006) BASE POPULATION VARIOUS DEMANDS

DESIGN

POPULATION

X

50 GAL/PER/DAY

(GPCD)

TABLE 6.2 SHORT-RANGE (2010-2015) TOTAL WATER DEMAND

NUMBER BUILDING DESCRIPTION

AVERAGE NON-

RESIDENT DRILL

POPULATION IS

EQUAL TO

EFFECTIVE

POPULATION

AVERAGE

RESIDENT

POPULATION

DESIGN

POPULATION

SPECIAL

INDUSTRIAL

NEEDS

AIRCRAFT

WASH

(THREE

AIRCRAFT

PER WEEK)

IRRIGATION

NEEDS

AIR-

CONDITIONING

NEEDS

OTHER

DEMANDS

TOTAL

REQUIRED

DAILY

DEMAND

MAXIMUM

DAILY

DEMAND

(2.5 TIMES

REQUIRED

DAILY

DEMAND)

REQUIRED

FIRE FLOW

REQUIRED

FIRE FLOW

FOR 1 HOUR

FIRE FLOW

PLUS 50%

REQUIRED

DAILY

DEMAND

943 TROOP COMMAND/SECURITY FORCES 97 0 146 7275 0 0 0 0 7275 18187.50 1500 90,000 93,638 945 JOINT USE TRAINING FACILITY/BAND 88 0 132 6600 0 0 0 0 6600 16500.00 1500 90,000 93,300 931 437th Bn/ARMORY 490 0 735 36750 0 0 0 0 36750 91875.00 1500 90,000 108,375

930 RTI 300 0 450 22500 0 0 0 0 22500 56250.00 1500 90,000 101,250

922 AVN 168 0 252 12600 0 300 0 0 0 12900 32250.00 3000 180,000 186,450

918 AVN 233 0 350 17475 0 600 0 0 0 18075 45187.50 1500 90,000 99,038

946 WMD 0 0 0 0 0 0 0 0 0 0.00 1500 90,000 90,000

READINESS CENTER 400 0 400 20000 0 0 0 0 0 20000 50000.00 1500 90,000 100,000

1776 0 2464 123,200 0 900 0 0 0 124,100 310,250 13,500 810,000 872,200

PEOPLE PEOPLE PEOPLE GPD GPD GDP GPD GPD GPD GPD GPD GPM GPH GPD

TOTAL

FIRE REQUIREMENTSDOMESTIC

REQUIREMENTSSHORT-RANGE (2010-2015) BASE POPULATION VARIOUS DEMANDS

DESIGN

POPULATION

X

50 GAL/PER/DAY

(GPCD)

Ohio Army National Guard Project No. NLZG062005

Technical Manual TM 5-813-1/AFM 88-10, Vol. 1, “Water Supply, Sources and General Considerations, 4 June 1987”. Since our effective population falls under the category “5000 or less”, a capacity factor of

1.5 will be utilized to determine the design population for estimating the domestic water demand.

6.1.4 DESIGN POPULATION

Design population is the population figure obtained by multiplying the effective population figure by the appropriate capacity factor.

Design Population = Effective Population x Capacity Factor

Design Population = 1,870 x 1.5 = 2,805 people

The resulting design population for the Present and Short Range periods are summarized in Tables 6.1 and 6.2.

6.1.5 DAILY DEMAND

Daily demand is the total daily water requirement. It is obtained by multiplying the design population by the appropriate per capita domestic water allowance plus any special industrial, aircraft-wash, irrigation, air-conditioning, or other demands. There are no water demands for special industrial, irrigation, or air-conditioning at OHANG. Water is needed for aircraft washing. Per information obtained from the

OHANG Facilities Engineer, on an average, three aircraft washes are performed during a week, utilizing approximately 300 gallons of water per wash cycle.

Required Daily Demand = (Design Population x per capita domestic water allowance)

+(other demands + aircraft-wash needs);

Required Daily Demand = (2,805 people x 50 gal/person/day+900 gal)

= 141,150 gpd

The resulting daily domestic demand for the Present and Short Range periods are summarized in Tables

6.1 and 6.2.

6.2 FIRE FLOW PROTECTION REQUIREMENTS

The fire flow requirement is the quantity of water in gallons per minute needed to control an anticipated fire in a building or group of buildings. Fire area is the total floor area in square feet for all floor levels within the exterior walls, or under the horizontal projection of the roof of a building.

The water supply system at OHARNG must be capable of supplying the fire flow demand plus normal consumption at residual pressure and for a normal fire fighting duration of 60 minutes. The requirements

TABLE 6.3 PRESENT (2006) FIRE FLOW DEMAND

NUMBER BUILDING DESCRIPTION

NUMBER

OF

FLOOR

LEVELS

TYPE OF

BUILDING

MATERIAL

TOTAL FIRE

AREA

TYPE OF

BUILDING

REQUIRED

FIRE FLOW

1 HR

SPRINKLERS

FIRE FLOW UP

TO 75%

REDUCTION DUE

TO SPRINKLER

SYSTEM

TOTAL

REQUIRED FIRE

FLOW

SQ. FT. GPM GPM GPM

943 TROOP COMMAND/SECURITY FORCES ONE BRICK 14,600 OPERATIONS 1,500 1,500

945 JOINT USE TRAINING/BAND ONE BRICK 9,344 TRAINING 1,500 1,500

931 437th Bn/ARMORY ONE BRICK 62,000 OPERATIONS 1,500 1,500

930 RTI ONE BRICK 26,958 OFFICE 1,500 1,500

922 AVIATION ONE METAL 12,316 HANGAR 3,000 YES 1,500 1,500

918 AVIATION ONE METAL 63,614 HANGAR 3,000 3,000

946 WMD ONE MASONRY 9,048 OFFICE 1,500 1,500

13,500 12,000TOTAL

TABLE 6.4 SHORT-RANGE (2010-2015) FIRE-FLOW DEMAND

NUMBER BUILDING DESCRIPTION

NUMBER

OF FLOOR

LEVELS

TYPE OF

BUILDING

MATERIAL

TOTAL FIRE

AREA

TYPE OF

BUILDING

REQUIRED

FIRE FLOW

1 HR

SPRINKLERS

FIRE FLOW UP

TO 75%

REDUCTION

DUE TO

SPRINKLER

SYSTEM

TOTAL

REQUIRED

FIRE FLOW

SQ. FT. GPM GPM GPM

943 TROOP COMMAND/SECURITY FORCES ONE BRICK 14,600 OPERATIONS 1,500 1,500

945 JOINT USE TRAINING/BAND ONE BRICK 9,344 TRAINING 1,500 1,500

931 437th Bn/ARMORY ONE BRICK 62,000 OPERATIONS 1,500 1,500

930 RTI ONE BRICK 26,958 OFFICE 1,500 1,500

922 AVIATION ONE METAL 12,316 HANGAR 3,000 Y 1,500 1,500

918 AVIATION ONE METAL 63,614 HANGAR 3,000 3,000

946 WMD ONE MASONRY 9,048 OFFICE 1,500 1,500

READINESS CENTER OPERATIONS 1,500 1,500

15,000 13,500TOTAL

Ohio Army National Guard Project No. NLZG062005 must be analyzed to determine whether the capacity of the system is fixed by the domestic requirements, the fire demand, or by a combination of both. Normally, where fire flows are relatively high, or required for long duration, and population and / or industrial use is relatively low, the total required water supply capacity will be determined by the prevailing fire flow demand.

6.2.1 FIRE FLOW REQUIREMENTS FOR BUILDINGS

Fire flow requirements in this study are based on “Water Supplies for Fire Protection”, Fourth Edition, published by Fire Protection Publications, Oklahoma State University and “Fire Protection Design

Manual”, Fourth Edition, published by Department of Veteran Affairs. Fire flow was calculated using the information provided in Table 4-A, Appendix A of “Water Supplies for Fire Protection”.

The calculated fire flow may be reduced up to 75 percent when the building is provided with an approved automatic sprinkler system. However, in no case this should be less than 1500 gallons per minute. Tables

6.3 and 6.4 present the fire flow demands for the Base.

6.2.2 FIRE FIGHTING DURATION

“Fire Protection Design Manual” requires that the fire flow for non-sprinklered buildings must be available for a minimum duration of 60 minutes for buildings exhibiting “favorable conditions”.

Favorable conditions are:

• Non-combustible construction

• Limited exposures

• Ready access to entire building site by fire department apparatus

• Quick response by adequately staffed fire department

Based on the above, this study assumes all buildings at the OHARNG exhibit favorable conditions. Fire flows for sprinklered buildings were calculated as required by NFPA 13, “Automated Sprinkler Systems

Handbook”, in accordance with the occupancy classification.

6.2.3 FIRE FLOW DEMAND

Fire flow is the required flow at a specific pressure at the site of the fire for a specific period of time. The requirements for the present OHANG installation are tabulated in Table 6.1. Therefore, the total present fire flow for the buildings is 12,000 gpm for the duration of 60 minutes for each building.

Fire flow = 24,000 gpm x 60 minutes =1,440,000 gallons

Ohio Army National Guard Project No. NLZG062005

6.2.4 TOTAL WATER DEMAND

Total water demand includes fire flow plus 50 percent of the required daily demand plus any industrial or other demand that cannot be reduced during a fire period. The residual pressure is specified for either the fire flow or essential industrial demand, whichever is higher. Total water demand must include flow required for automatic sprinkler and standpipe operation, as well as direct hydrant flow demand, when the sprinklers are served directly by the water system.

6.3 PEAK DOMESTIC DEMAND

For system design purposes, the peak domestic demand is considered to be the greater of: (1) the maximum daily demand or; (2) total water demand.

For the present installation, maximum daily demand equals 2.5 times the required daily demand, therefore:

Maximum Daily Demand = 141,150 gallons x 2.5 = 352,875 gpd

And, the fire flow plus 50% of the required daily demand is:

1,440,000 + (0.5 x 141,150) = 1,510,575 gpd

Based on the above, the peak domestic demand is 1,510,575 gpd.

6.4 DESIGN WATER DEMANDS VERSUS ACTUAL WATER USE

Table 6.5 presents the actual water use of OHARNG taken from quarterly billing cycles from the Franklin

County Engineer’s Office. The actual water use is compared with the calculated water demands to ascertain the capability of the existing system to handle the daily domestic flows. As can be seen, the actual daily water use is significantly less that the calculated daily water demand. The existing 10-inch waterline connecting to the RANGB water system has the capacity to provide 600 gpm, or 864,000 gpd at

72 pounds per sq. inch (psi), which is the pressure cited for the water system. Once the existing water system improvements are completed, the water delivery system pressure will increase to 85-95 psi, thereby increasing the water system capacity.

Ohio Army National Guard Project No. NLZG062005

TABLE 6.5 ACTUAL WATER USE

NUMBER BUILDING DESCRIPTION GPD PER BILLING CYCLE

946 WMD 23

945 JOINT USE TRAINING/BAND 11

944 DISTANCE LEARNING CTR 2

943 ARMORY 32

941 IT BUILDING 3

933 ARMORY 30

931 437th Bn 233

930A RTI BARRACKS 34

930 RTI 47

922 C-26 HANGAR 90

920 ARMORY 26

918 HH-60 HANGAR 1

917 DINING FACILITY 8

915 ARMORY 15

TOTAL 555

6.5 PROPOSED WATER DISTRIBUTION IMPROVEMENT

6.5.1 EXISTING WATER SYSTEM IMPROVEMENTS

Prior to installing any water distribution improvement, it is necessary to determine if the existing system requires any improvements. Previous studies identified asbestos pipe (TRANSITE) in the system, which is a potential hazardous material. Additionally, previous studies found that due to the age and deteriorated condition of the distribution system, the system has been operating at reduced pressures. It is recommended that those water system pipes identified as TRANSITE be replaced with ductile iron pipes and all valves and appurtenances in the TRANSITE pipe segments be inspected and checked for condition and proper operation, and repaired/replaced as necessary. The TRANSITE pipe extends into the

Air National Guard area and will require coordination between the two branches for complete replacement of this pipe. Figure 6.1 presents the water system piping identified as requiring replacement.

The City of Columbus installed a 24” waterline that runs on the north side of Tank Truck Road. Once the water distribution system repairs described above are completed, connections shall be made to this existing water line, increasing delivery pressure and system capacity for the proposed facilities.

The existing 10” waterline from the RANGB area is sufficiently sized to supply the required daily plus fire flows through the 2015 expansion.

Ohio Army National Guard Project No. NLZG062005

6.5.2 FUTURE WATER SYSTEM CONNECTION

Future water system work will include connecting the proposed Readiness Center facility to the existing water system. Based on the future population for this facility, a water service tap should be all that will be required. Costs for this tap are presented in Chapter 9.

6.6 IRON IN THE WATER DISTRIBUTION SYSTEM

Based on reports from the RANGB BCE, water quality at RANGB displays high iron content, particularly on the first Monday after a drill weekend. As the OHARNG water system is connected to the RANGB system, that system is affected by high iron content. Water supply to the old Lockbourne Air Force Base was provided from water wells on the site. Apparently, the water from these wells was known to have high iron content. Over a period of time, it is suspected that some of the water distribution system piping may have developed iron deposits on the inside surfaces. When the Air Force base closed, the wells ceased to be a source of water supply as the facilities began receiving water from the City of Columbus.

The Air and Army National Guard units do not normally work on weekends, except Drill. Therefore, the water in the system becomes stagnant and remains in contact with iron deposits in the pipe for an extended time. At the start of the week on Monday, it is likely that the water in the first few minutes would have a relatively high iron content.

A detailed investigation is necessary to determine the causes of the high iron content in the water supply and to arrive at the most cost effective method of eliminating the problem. The scope of such an investigation may be as follows:

(1.) Extensive sampling of water from the existing distribution system over a specified period of time;

(2.) Closed-circuit televising of the existing distribution system;

(3.) Hydraulic and other system modeling;

(4.) Evaluation of available treatment methods;

(5.) Cost effectiveness of two alternatives;

- chemical treatment;

- replacement of existing piping by a new waterline loop system.

6.7 MODELING A NEW WATER DISTRIBUTION LOOP

The OHARNG Facilities Manager asked PRIME to develop a concept design of a new waterline loop in the OHARNG area. This loop would connect to the new water main for the CRAA area.

Ohio Army National Guard Project No. NLZG062005

Installing a new waterline loop for the OHARNG area may be one of several actions taken to solve the iron concentration problems. Additionally, the new waterline should be able to supply the current and projected fire flow and peak domestic demands. Fig. 6-2 shows a concept of a new water distribution loop system. The final water distribution system loop should be determined only after a detailed study and design.

In the absence of detailed design to replace the existing distribution system, a preliminary estimated cost for a new waterline distribution loop in the OHARNG area is approximately $870,000.

6.8 ESTIMATED COSTS

Estimated costs for replacing the TRANSITE waterline pipe are presented in Table 6.6. The estimated costs include 15% construction administration fees, 20% for contingency, and 10% for engineering and design fees.

TABLE 6.6 TRANSITE WATERLINE REPLACEMENT COSTS

WORK REQUIRED ESTIMATED COSTS

Replace 6,000 feet of TRANSITE Water Line

$331,000

Valves and appurtenances $25,000 Fire Hydrants (5 ea.) $10,000 Investigate iron concentration $75,000 Total Estimated Costs $441,000

Ohio Army National Guard Project No. NLZG062005

7. SANITARY SEWER SYSTEM

7.1 QUANTITY OF WASTEWATER

The design wastewater flow must be determined for any segment of existing or proposed sewer. The flow determination must include sanitary or domestic wastes based on the population served by a given segment, extraneous I/I, and contributing industrial flows. Since existing flow records or data showing required flow capacity are not available for the OHARNG, the methods and criteria discussed below will be used to develop design flows. Table 7.1 and 7.2 provide the existing and proposed populations, flows, demands, and design flows used during this study.

7.2 GENERAL DESIGN CRITERIA

In order to evaluate capacity of the existing sanitary sewer system and recommend the most rational design, we have compared the methodology for the design of sanitary sewers of the Joint Departments of the Army and Air Force USA and methodology of City of Columbus, Division of Sewerage and

Drainage. As the City of Columbus may at some future time assume responsibility of the sanitary sewer system, and their design requirements are more stringent, the Columbus methodology will be used.

7.3 CITY OF COLUMBUS, DIVISION OF SEWERAGE AND DRAINAGE DESIGN CRITERIA

The City of Columbus criteria include a series of sewer design parameters required in the Columbus sewer system. A summary of these parameters for the each range are shown in Tables 7.1 and 7.2. Based on these criteria, the parameters were computed for the OHARNG sewer system.

7.3.1 AVERAGE SANITARY WASTEWATER FLOW

A rate of 0.0002 cfs per capita (based on 130 gpcd) multiplied by the density for the area under consideration shall determine the average sanitary flow.

Average Daily Flow (ADF) = 0.0002 cfs X Person (# of People)

ADF = 0.0002 cfs X 1,870 People during UTA weekend event

ADF =0.41 cfs

Design flows will be then determined by calculating the Peak Flow.

7.3.2 PEAK SANITARY WASTEWATER FLOW

To determine the peak sanitary flow, the average flow is multiplied by a peak factor of 3.5 (from

Columbus design criteria)

Peak (PF) Flow = 3.5 x 0.41 cfs = 1.44 cfs

TABLE 7.1 PRESENT (2006) SANITARY WASTEWATER FLOW

NUMBER BUILDING DESCRIPTION

MAXIMUM NON-

RESIDENT UTA

POPULATION

MAXIMUM

RESIDENT

POPULATION

TOTAL

POPULATION

AVERAGE

SANITARY

FLOW

(ADF)

0.0002 CFS

/CAPITA/DAY

AVERAGE

SANITARY FLOW

(ADF)

130GAL /

CAPITA/DAY

INDUSTRIAL

FLOW

AIRCRAFT-

WASH FLOW

(THREE

AIRCRAFT

PER WEEK)

IRRIGATION

FLOW

AIR-

CONDITIONING

FLOW

OTHER

FLOW

TOTAL

OTHER

DAILY

FLOW

TOTAL

OTHER

DAILY

FLOW

TOTAL

DAILY

FLOWS

TOTAL

DAILY

FLOWS

PEAK

SANITARY

WASTEWATER

FLOW

CONTRIBUTING

INFILTRATION

& INFLOW

TOTAL

DESIGN

FLOW

PEOPLE PEOPLE PEOPLE CFS GPD GPD GPD GPD GPD GPD GPD CFS GPD CFS CFS CFS CFS

943 TROOP COMMAND/SECURITY FORCES 97 0 97 0.0194 12,610 0 0 0 0 0 0 12,610 0.0195 0.0683 0.004 0.072

945 JOINT USE TRAINING/BAND 88 0 88 0.0176 11,440 0 0 0 0 0 0 11,440 0.0177 0.0620 0.002 0.064 931 437th Bn 490 0 490 0.0980 63,700 0 0 0 0 0 0 63,700 0.0986 0.3450 0.008 0.353

930 RTI 300 0 300 0.0600 39,000 0 0 0 0 0 0 39,000 0.0603 0.2112 0.004 0.215

922 AVN 168 0 168 0.0336 21,840 0 300 0 0 0 300 0.0000 22,140 0.0343 0.1199 0.002 0.122 918 AVN 233 0 233 0.0466 30,290 0 600 0 0 0 600 0.0005 30,890 0.0478 0.1673 0.020 0.187

946 WMD 0 0 0 0.0000 0 0 0 0 0 0 0 0 0.0000 0.0000 0.000 0.000

1,376 0 1,376 0.2752 178880 0 900 0 0 0 900 0.0005 179780 0.2782 0.9736 0.040 1.01TOTAL

TABLE 7.2 SHORT-RANGE (2010-2015) SANITARY WASTEWATER FLOW

0 BUILDING DESCRIPTION

MAXIMUM NON-

RESIDENT UTA

POPULATION

MAXIMUM

RESIDENT

POPULATION

TOTAL

POPULATION

AVERAGE

SANITARY

FLOW

(ADF)

0.0002 CFS

/CAPITA/DAY

AVERAGE

SANITARY FLOW

(ADF)

130GAL /

CAPITA/DAY

INDUSTRIAL

FLOW

AIRCRAFT-

WASH FLOW

(THREE

AIRCRAFT

PER WEEK)

IRRIGATION

FLOW

AIR-

CONDITIONING

FLOW

OTHER

FLOW

TOTAL

OTHER

DAILY

FLOW

TOTAL

OTHER

DAILY

FLOW

TOTAL

DAILY

FLOW

TOTAL

DAILY FLOW

PEAK

SANITARY

WASTEWATER

FLOW

CONTRIBUTING

INFILTRATION

& INFLOW

TOTAL

DESIGN

FLOW

PEOPLE PEOPLE PEOPLE CFS GPD GPD GPD GPD GPD GPD GPD CFS GPD CFS CFS CFS CFS

943 TROOP COMMAND/SECURITY FORCES 97 0 97 0.0194 12,610 0 0 0 0 0 0 12,610 0.0195 0.0683 0.004 0.072

945 JOINT USE TRAINING/BAND 88 0 88 0.0176 11,440 0 0 0 0 0 0 11,440 0.0177 0.0620 0.002 0.064 931 437th Bn 490 0 490 0.0980 63,700 0 0 0 0 0 0 63,700 0.0986 0.3450 0.008 0.353

930 RTI 300 0 300 0.0600 39,000 0 0 0 0 0 0 39,000 0.0603 0.2112 0.004 0.215

922 AVN 168 0 168 0.0336 21,840 0 300 0 0 0 300 0.0000 22,140 0.0343 0.1199 0.002 0.122 918 AVN 233 0 233 0.0466 30,290 0 600 0 0 0 600 0.0005 30,890 0.0478 0.1673 0.002 0.169

946 WMD 0 0 0 0.0000 0 0 0 0 0 0 0 0 0.0000 0.0000 0.000 0.000

READINESS CENTER 400 0 400 0.0800 52,000 0 0 0 0 0 0 0 52,000 0.0805 0.2816 0.000 0.282

1,776 0 1,776 0.3552 230,880 0 900 0 0 0 900 0.0005 231,780 0.3586 1.2552 0.0220 1.28TOTAL

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In addition to the peak daily sanitary design flow, provision for I/I must be incorporated in the overall capacity of sanitary sewer.

7.3.3 INFILTRATION AND INFLOW

City of Columbus standards for infiltration and inflow (I/I) require a rate of 0.003 cfs per acre of contributing tributary area to the portion of the collection system under analysis.

I/I = 0.003 cfs / acre x 159.84 acres = 0.48 cfs

This is the total I/I from the entire OHARNG area. However, in analyzing the sanitary sewer system, each building or facility contributes that portion of the total I/I represented by the contributing tributary area. For example, Building 931 contributes approximately 2.7 acres to the total tributary area of

OHARNG. Therefore, the I/I contribution to the sanitary system carrying flows from this building would be:

I/I (Bldg. 931) = 0.003 cfs / acre x 2.7 acres = 0.008 cfs

7.3.4 DESIGN FLOW

The design flow is the sum of the peak sanitary flow and the total infiltration up to the point in question.

Total System Design Flow = Peak ADF + I/I

= 1.44 cfs + 0.08 cfs

= 1.52 cfs

7.3.5 DESIGN CAPACITY

Design capacity shall not exceed the following percentages of pipe flowing full capacities:

• 15” or less should be designed to convey total design flow at 50% of the pipes rated full flow capacity for the slope selected.

• 18” to 30” are sized at 75% capacity.

• Any pipes greater than 30”, are sized flowing at 92% of their rated full flow capacity.

7.4 PIPE SIZE

Main line sanitary sewers shall be a minimum of eight inches (8”) nominal inside diameter. Sanitary service lines (laterals) shall be a minimum of six inches (6”) nominal inside diameter. Reduction in pipe size in the downstream direction will not be permitted by the City of Columbus regardless of the slope of the pipe.

Ohio Army National Guard Project No. NLZG062005

7.5 EXISTING SANITARY SEWER REPAIRS/REPLACEMENT

Field investigation of existing sanitary sewers and review of previous studies of the RANGB area have found that the overall condition of the sanitary sewers in the OHARNG area are in poor to fair condition, with several segments displaying cracks, mineral deposits, and offset joints. Additionally, the CCTV results showed several areas of I/I in the system. Therefore, in the absence of any visible open cut repairs required, PRIME recommends that all of the sanitary sewers be rehabilitated with cured-in-place pipe

(CIPP) linings. CIPP lining will enhance the structural integrity of the sewers and provide a barrier to I/I, thereby increasing the efficiency of the sanitary system. Figure 7.1 presents the sanitary pipe segments recommended for CIPP.

In addition to the CIPP process for the sewers, it is also recommended that the brick manholes in the sanitary system be lined with cementitious material. This process has a similar effect on manholes that

CIPP lining has on sewers. Lining the manholes will significantly reduce the I/I into the manholes.

7.6 PROPOSED SANITARY IMPROVEMENTS

Any proposed sanitary sewer work will consist of connecting the new Readiness Center to the existing system. Connection will include installation of (1) a 6” lateral to the existing system and, (2) a cleanout structure.

7.7 ESTIMATED COSTS

Estimates for completing the CIPP lining of the sanitary sewers are $511,000. Estimated costs for applying cementitious lining to 11 manholes are $44,000. Included in the estimated costs are engineering and design fees, construction administration, and contingency fees. Table 7.3 presents a summary of the sanitary sewer rehabilitation costs.

TABLE 7.3 SANITARY SEWER REHABILITATION COSTS

Work Required Estimated Costs

CIPP line 650 linear feet of 12" sanitary sewer $80,000

CIPP line 2,225 linear feet of 10" sanitary sewer $243,000

CIPP line 590 linear feet of 8" sanitary sewer $56,000 CIPP line 1,820 linear feet of 6" sanitary sewer $132,000

Cementitious lining 11 manholes $44,000 Total Costs $555,000

Ohio Army National Guard Project No. NLZG062005

8.0 CONSTRUCTION PHASING PLAN

Construction phasing for both the water distribution system and sanitary sewer system should proceed as follows:

1. Replace 6,000 linear feet of TRANSITE water distribution system piping.

2. Rehabilitate 650 linear feet of 12-inch sewer, 2,225 linear feet of 10-inch sewer, 590 linear feet of 8-inch sewer, and 1,820 linear feet of 6-inch laterals with CIPP lining.

3. Install the sanitary lateral as part of the site development phase for the new Readiness Center.

4. Install the water service tap as part of the site development phase for the new Readiness

Center.

Ohio Army National Guard Project No. NLZG062005

9.0 ESTIMATED COSTS

Estimated costs for completing all the recommended upgrade/improvement projects is $921,000. Table

9.1 presents the costs as a breakdown of each portion of the work necessary to provide adequate operation and structural integrity to the water supply system and sanitary collection system. These estimated costs include engineering and design fees, construction administration, and contingency costs.

TABLE 9.1 SUMMARY OF ESTIMATED IMPROVEMENT COSTS

Work Required Estimated Cost

CIPP line 650 feet of 12” sanitary sewer $80,000

CIPP line 2,225 feet of 10” sanitary sewer $243,000

CIPP line 590 linear feet of 8” sanitary sewer $56,000

CIPP line 1,820 linear feet of 6" sanitary sewer pipe. $132,000

Cementitious lining 11 manholes $44,000

Sub Total for Sanitary Work $555,000

Replace 6,000 feet of 8” & 10" TRANSITE water pipe, w/ appurtenances and hydrants.

$366,000

Investigate iron concentration $75,000 Total Projected Costs $996,000

Not included in Table 9.1 is the estimated cost of complete replacement of the entire waterline loop distribution system. The estimated cost for this portion of the OHARNG upgrade is $600,000. If the decision is made to install an entire new waterline loop, then the cost of replacing the transite pipe will be absorbed into this cost. Therefore, if OHARNG decides to complete all of the recommended upgrades/improvement work, the total estimated construction cost should be approximately $1,155,000.

A tap fee and sewer charge will be required if the waterline connection is made to the existing 24-inch waterline that runs along South Perimeter Road north of the OHARNG cantonment. This existing waterline belongs to the City of Columbus, therefore Columbus tap and sewer charges apply. Tap fees to the City of Columbus water system are based on the size of the tap installed, plus a meter charge, a system capacity charge, and a frontage charge.

Ohio Army National Guard Project No. NLZG062005

These charges are broken down as follows:

- Tap charge based on tap size, 8-inch, charge is cost plus 25%, estimated to be approximately

$6,400.

- Meter charge based on meter size, 8-inch, $8,100.

- System capacity charge, contract area, $93,250.

- Frontage charge, based on $22 per linear foot of property that abuts on the street right-of-way.

For the OHARNG cantonment, this length measures approximately 3,300 feet, for a total frontage charge of $72,600.

Totaling the City of Columbus fees and charges, the approximate cost should be $181,000. The Columbus

Division of Water will credit any existing taps to the Franklin County or RIAA water system. These credits will be deducted from the total fees and charges for the new taps. These fees are based on 2006 rates, as it is not known at this time when the connection will be made. These charges will need to be increased at an annual rate to account for inflation that coincides with the time frame the connection is completed.

Ohio Army National Guard Project No. NLZG062005

10.0 20-YEAR LIFE CYCLE COSTS

10.1 Evaluation Period

The evaluation period for the life cycle cost analysis is 20 years. Assuming the proposed water and sanitary sewer improvements are completed in 2008, the evaluation period will be from 2009 to 2028.

10.2.1 Water System

10.2.1 Estimated Construction Costs

As shown in Table 9.1, the estimated construction cost for improvements to the water system is $441,000.

If, as a result of the new study recommendations by PRIME, OHARNG decides to replace the entire existing water system with a new ductile iron (DIP) loop, the estimated construction cost is $1,155,000.

10.2.2 Estimated Annual Operations and Maintenance (O&M) Cost

Operations & maintenance costs have been broken down into four categories that will affect the life cycle costs of the water system. The categories are as follows:

• Labor for system operations;

• Water use charges:

• Hydrant flushing as part of regular scheduled maintenance;

• Miscellaneous repairs, assume $5,000 annually.

(a) Labor for System Operations: The calculations of labor costs for system operations are based on the following assumptions:

• One maintenance supervisor and one laborer/worker assigned to the entire utilities (water, sanitary sewer, electricity, communications) systems for the base;

• Twenty-five (25) % of each persons’ work is devoted to water system operations;

• Supervisor’s salary is $70,000 inclusive of benefits;

• Laborer/worker salary is $40,000 inclusive of benefits.

Based on these assumptions, annual operating costs attributed to these positions is $27,500.

(b.) Water Use Charges: Water use charges are the actual billings for RANGB.

(c.) Hydrant Flushing: Hydrant flushing is normally performed once per year and results in an increase in water use during the month when the hydrants are flushed.

(d.) Miscellaneous Repairs: These may be any non-scheduled or emergency repairs that may arise during the year. In the absence of any maintenance records, this cost is assumed to be $5,000 for 2009.

Ohio Army National Guard Project No. NLZG062005

Tables 10.1 and 10.2 present the operations and maintenance costs over a 20-year period starting 2009.

These costs are also presented graphically in Figures 10.1 and 10.2.

Table 10.1 Water Use Costs Over 20 Years

Year Water Use Charges Daily Use Annual Use per cubic foot (cf) gallons gallons cubic feet

Water Use Charge per cf annually

2009 $6.40 184 67160 8,980 $57,472 2010 $6.66 184 67160 8,980 $59,771 2011 $6.92 184 67160 8,980 $62,162 2012 $7.20 184 67160 8,980 $64,648 2013 $7.49 184 67160 8,980 $67,234 2014 $7.79 184 67160 8,980 $69,923 2015 $8.10 184 67160 8,980 $72,720 2016 $8.42 184…