ELK MEADOWS HOA

Water Master Plan(Supply, Treatment, Distribution, and Storage)

May 2005

OBJECTIVES Evaluate Existing Water Supply and Water

Treatment Facilities

Hydraulic Modeling Recommend Improvements for a Buildout System

(Without Fireflow Protection )

Recommend Improvements for a Buildout System (With Fireflow Protection)

Recommend Improvements for Water Supply, Treatment and Distribution

Estimate Costs and Investigate Funding Alternatives for Recommended Improvements

PROJECT APPROACH

Collect Background Information

Review CDPHE and EPA Requirements

Conduct Site Investigations

Inventory and Photograph Existing Facilities

interview System Operator(s)

Hydraulic Analysis with WaterCAD® Software

Develop Water Demands

Evaluate Existing Facilities (Max Day, Peak Hour)

Model Short-Term and Long-Term Alternatives

WATER SUPPLY SOURCESGroff Spring

Classified as ‘Directly Under Influence of Surface Water’

Produces 28,000 gpd (20 gpm)

High Raw Water Turbidity (5 NTU up to 100 NTU)

No Hazardous Metals, Volatile Organics

Elk Meadows Well Completed in May 2003 as

Supplemental Source Produces 15,000 gpd (10

gpm) Acceptable Raw Water

Quality No Hazardous Metals,

Volatile Organics

Most recent boil-order in May of 2003.

Water rights allow a TOTAL of 53,800 gpd (37gpm) for combined well and spring source.

WATER DEMAND SUMMARYWATER DEMAND SUMMARY

*Estimated from Operations Data During for 2004 per Elk Meadows HOA. ** Assumes Average Annual Demand: Peak Hour Demand Factor = 4.00 (Mayes, 2000).

CONNECTION TYPENUMBER

OFCONNECTIONS

2004 SCENARIO (gpcd)

BUILDOUT SCENARIO

(gpcd)

Average Day Demand (gpcd) 80 72 80

Maximum Day Demand (gpcd) 126 129 143

2004 Average Annual Demand (gpd)

2004 Max Day Demand (gpd)

2004 Peak Hour Demand (gpd)

Max Day: Avg Day Factor

Peak Hour: Avg Day Factor 4.00**

11,520*

36,100*

46,080**

3.10

WATER TREATMENT PLANT

WATER TREATMENT PLANT

Building is 30 Years Old Upgraded in 2002 To Include Coagulation and Pressure

Filtration Hypochlorite Disinfection No Baffling in Clearwell to Provide Chlorine Contact Time Currently Backwashes with Raw Water (not allowed by CDPHE) Inappropriate for higher turbidity (>5 NTU) Raw Water per

(CDPHE) Backwash Wasted to Unlined Pond (not allowed by CDPHE) Need Additional Treatment Capacity No Redundancy or Expandability

WATER TREATMENT

Existing WTP

Capacity of 22,680 gpd

In-line Flocculation

• Coagulant Added to Raw Water

• Forms ‘Flocs’

Pressure Filtration

• Bag Filter Redundancy

• Effluent to Disinfection

WATER TREATMENT

Wet Well

Groff Spring

Well

Pressure Filter

Sodium Hypochlorite

Bag Filter Unbaffled

Clear Well

Raw Water Backwash

PAC Coagulant

(Alum)

To Distribution & Storage

FILTRATION

Vertical Pressure Filter

2-ft Diameter Yardney®

3.15 ft2 Filtration Area

Current Filtration Rate = 8 gpm/ft2

CDPHE Max. Filtration Rate = 5 gpm/ft2

Bag Filter

Strainrite®

Filters Down to 1.0 Micron

WATER TREATMENT OPTIONSWATER TREATMENT OPTIONSRETROFIT EXISTING WTP Add 2nd New Pressure Filters Additional Building Space Required Install larger capacity Backwash Pump That Draws from Clearwell Install Baffles in Clearwell May or May Not Fix Finished Water Turbidity

NEW WTP OPTION New Building with Package Plant or Membrane Plant Install Baffles in Clearwell More Expensive than Retrofitting Existing WTP Will Handle Peaks in Raw Water Turbidity Long-term Solution

DISTRIBUTION SYSTEM

EXISTING DISTRIBUTION SYSTEMEXISTING DISTRIBUTION SYSTEM

WATER DISTRIBUTION SYSTEM

Serves 80 Unmetered Connections

Most Piping is 30 Years Old

Comprised largely of 2-inch Diameter Piping

Materials Vary from PVC to HDPE

Problems with Pipe Leaks and Freezing

HOA Incurs Significant Costs for Repairs and Replacement ($150,000 from 2000 to 2004)

No Fireflow Protection

No Hydrants

EXISTING HYDRAULIC PROFILEEXISTING HYDRAULIC PROFILE

Single 5-HP Transmission Pump Located at WTP

12,000-gal Tank Serves Zones Through PRVs

CDPHE Pressure Criteria

• Maximum = 100 psig

• Minimum = 35 psig

Pressure Zone Boundaries

• Zone 1 = 8,500 to 8,580 ft

• Zone 2 = 8,581 to 8,719 ft

• Zone 3 = 8,720 to 8,864 ft

STORAGE

STORAGE

Storage

12,000-gal Capacity

Aged

Serves Entire Community

Need Additional Capacity

WATER STORAGE NEEDSWATER STORAGE NEEDS

STORAGE COMPONENT

CDPHE REQUIREMENT with

FIRE

(GALLONS)

CDPHE REQUIREMENT

without FIRE

(GALLONS)

Fireflow 120,000 0

2004 Domestic

Buildout Domestic

60,000*

100,000

60,000*

100,000

Emergency 0 0

Operational 0 0

TOTAL AT BUILDOUT 220,000 120,000

*CDPHE requires 300 gallons per capita; Assumes 80 homes with 2.5 persons per home.

HYDRAULIC MODEL

HYDRAULIC ANALYSISHYDRAULIC ANALYSIS Haestad Methods

WaterCAD®

Steady-State Analysis

Multiple Scenarios

• 2004 Max Day

• 2004 Peak Hour

• Buildout Max Day

• Buildout Max Day + Fireflow

Identify Problems

Two Buildout Scenarios

• Option I – No Fireflow Protection

• Option II – Provide Fireflow Protection

HYDRAULIC ANALYSIS RESULTSHYDRAULIC ANALYSIS RESULTS

Reservoir Drains During Max Day Demand

Low Pressures in Zone 3 at Peak Hour (<20 psig)

Max Day Demand Approaching Available Water Supply

Max Day + Fire Demand Indicates Significant Piping and Storage Improvements Needed

Modeled Buildout System Without Fire Protection

Modeled Buildout System With Fire Protection

SHORT-TERM IMPROVEMENTSSHORT-TERM IMPROVEMENTS

SHORT-TERM IMPROVEMENTSSHORT-TERM IMPROVEMENTS

ID, DESCRIPTIONUNITS QUANTITY COST

ST 1A, Add 2” PRV Zone 3 to Zone 2 EA 1 $ 9,000

ST 1B, New Zone 3 Piping (3” DIA) LF 850 $ 13,000

ST 2, Zone 2 Looping (3” DIA) LF 240 $ 3,600

ST 3, Zone 3 Looping (3” DIA) LF 460 $ 6,900

ST 4, New Pipe from WTP to Zone 3 (3” DIA) LF 2,670 $ 40,000

ST 5, Line Replacement (Replace w. 3” DIA) LF 5,000 $ 75,000

Existing Well Enlargement LS 1 $ 7,500

Remedial Work @ Treatment Plant LS 1 $ 6,000

SUBTOTAL $ 161,000

ENGINEERING AND ADMINISTRATION (20%) $ 32,200

TOTAL PROJECT COST $193,200

BUILDOUT SYSTEM SCENARIOSBUILDOUT SYSTEM SCENARIOS

Option I – Maximum Day Demand Only (No Fire)

• Implement all Short-Term Improvements

• Recommend All New Piping be 3-inch Diameter or larger

Option 2 – Maximum Day Demand (+ Fire)

Implement all Short-Term Improvements All New Piping 6-inch Diameter Require 6-inch Fire Hydrants Use 1997 UFC Requirement of 1,000 gpm at 2-hour

Duration with Residual Pressure of 20 psig = 120,000-gal Storage

OPTION 1 IMPROVEMENTSOPTION 1 IMPROVEMENTS(NO FIREFLOW PROTECTION)(NO FIREFLOW PROTECTION)

OPTION 1 SYSTEM COSTSOPTION 1 SYSTEM COSTS

ID, DESCRIPTIONUNIT

SQUANTIT

YINSTALLED COST

O1-1, West Zone 3 Piping (3” DIA)

LF 1,000 $15,000

O1-2, East Zone 3 Piping (3” DIA)

LF 620 $9,300

O1-3, Central Zone 3 Piping (3” DIA)

LF 1,460 $21,900

O1-4, Zone 2 Loop Piping (3” DIA)

LF 940 $14,100

New Coated Steel Storage Reservoir

MG 0.100 $70,000

SUBTOTAL $130,300

ENGINEERING & ADMIN. (20%)

$26,000

TOTAL PROJECT COST $156,300The costs in do not include new water meters, improvements to the WTP or maintenance costs for existing piping, which are included in the short-term improvements and should also be budgeted in the HOA’s capital improvements plan. Also, the storage volume is the minimum domestic storage required by the CDPHE and doesn’t include an emergency storage component.

OPTION 2 IMPROVEMENTSOPTION 2 IMPROVEMENTS(FIREFLOW PROTECTION)(FIREFLOW PROTECTION)

OPTION 2 SYSTEM COSTSOPTION 2 SYSTEM COSTS

ID, DESCRIPTIONUNITS QUANTITY

INSTALLED COST

O2-1, Zone 3 Piping (8” DIA) LF 4,250 $170,000

O2-2A, Zone 3 Piping (6” DIA) LF 10,430 $313,000

O2-2B, Zone 3 Fire Hydrants EA 12 $12,000

O2-3A, Zone 2 Piping (6” DIA) LF 6,340 $190,200

O2-3B, Zone 2 Fire Hydrants EA 4 $4,000

O2-4, New PRVs with Vaults EA 1 $40,000

O2-5A, Zone 1 Piping (6” DIA) LF 320 $9,600

O2-5B, Zone 1 Fire Hydrants EA 1 $1,000

New Storage Reservoir MG 0.220 $110,000

SUBTOTAL $849,800

ENGINEERING & ADMIN. (20%)

$170,000

TOTALPROJECT COST $1,020,000

The costs in do not include water meters or improvements to the WTP present an economic challenge for the Elk Meadows HOA and residents. Funding options available for financing these improvements are discussed in Section 6.3. Also, the improvements could be phased over a long period with the storage reservoir and Zone 3 piping improvements taking priority over improvements in Zones 1 and 2. This is due to the fact that Zone 3 piping and PRVs provide storage and distribution to Zones 1 and 2 and any restrictive piping in Zone 3 would be apparent in the downstream Zones.

SUMMARY OF RECOMMENDED SUMMARY OF RECOMMENDED SYSTEM IMPROVMENTSSYSTEM IMPROVMENTS

Project Description Project Cost

Short-Term Improvements $ 193,000

Option 2 (Build-out with Fire) $ 958,000

Additional Source Development $ 100,000

Treatment Plant Replacement $ 500,000

Meters $ 70,000

Total $ 1,821,000

ALTERNATIVE ALTERNATIVE SYSTEM IMPROVMENTSSYSTEM IMPROVMENTS

Project Description Project Cost

Short-Term Improvements $ 177,000

Option 1 (Build-out with Fire) $ 199,000

Additional Source Development $ 100,000

Treatment Plant Upgrades (if permittable) $ 75,000

Meters $ 50,000

Total $ 601,000

FUNDING OPTIONSFUNDING OPTIONS Colorado Rural Water Association - Loans Colorado Water Conservation Board - Grants Up to 75% of

Project Cost Department of Agriculture - Grants and Loans

• Objective to Improve Rural Areas

• Priory Given for Public Safety Projects

Department of Local Affairs (DOLA)• Offers Grants and Loans

Other (595, Special Legislative Grants, etc.)

In general, Government Grants require formation of a legal Governmental Entity (i.e. District)

Low to Moderate Income Eligibility (Income Survey)