Engineering Design Manual - Loudoun Water

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Chapter 7: Community Water Systems Applicant for resubmission. The Applicant shall cite in the letter of the transmittal all shop drawing variances from the requirements of the contract Documents and the design modifications proposed to accommodate the variances. If variances are not cited, the Applicant will not be relieved of the responsibility for executing the work in full conformance with the Contract Documents even though such submittals have been accepted by Loudoun Water. D. Pumps and other major process equipment shall be certified by the manufacturer. Certifications shall be provided to Loudoun Water prior to shipping to the site. I. General To 12 VAC5-590-640 add the following: B. Plans shall be submitted in accordance with the requirements of Chapter 3 of this Manual. J. Capacity of Waterworks To 12 VAC 5-590-690 add the following: A. The maximum daily design flow shall be 900 gallons per equivalent residential connection. Treatment process units shall be sized to match the well pumping capacity. B. Minimum acceptable effective storage for domestic purposes shall be not less than 450 gallons per equivalent residential connection while maintaining minimum working pressures. C. Minimum working pressure at service connections shall be 50 psi at peak hourly flow rates under build-out conditions, and with system equalization storage at either low levels or pressures. D. All groundwater systems shall provide the number of wells that are anticipated to be capable of continuously pumping no less than 1.2 gpm per connection for 60 consecutive days. D1. Groundwater systems having more than fifty connections shall have the number of hydrogeologically independent wells indicated below. (All well yield combinations stated below refer to the minimum pumping test rates to be used during a 72 hour groundwater testing program, as described in Section P Groundwater Sources (12 VAC 5-590-840) of this Chapter. D1a. Provide 3 wells, with each producing a minimum of 0.6 gpm per connection. Two wells shall be in service; the third well shall be identified and developed and reserved as a backup well with the required easements. Once the development reaches 60% of buildout, Loudoun Water will assess whether the raw water line and the reserve well must be placed in service. D1b. Four or more wells, the two smallest of which shall produce a combined minimum of 0.6 gpm per connection and with the smallest well producing at least 0.12 gpm per Engineering Design Manual September 2010 96
Chapter 7: Community Water Systems connection. A standby well shall undergo initial hydro geological testing and be reserved as a backup well with the required easements. Once the development reaches 60% of build-out, Loudoun Water will assess whether the raw water line and backup well must be developed by the applicant and placed in service. Wells in service shall produce a minimum of 1.2 gpm per connection. D2. Groundwater systems serving 26 to 50 connections shall have at least 2 wells producing a combined total of 1.8 gpm per connection, the smallest of which must produce a minimum of 0.6 gpm per connection. D3. Groundwater systems serving 25 or fewer connections shall have at least 2 wells producing a combined total of 2.4 gpm per connection, the smallest of which must produce a minimum of 0.6 gpm per connection. D4. For areas of karst topography, the potential for well failure is greater. Therefore, all such groundwater systems shall have in addition to what is stated above at least one additional standby well developed and capable of producing at least 0.3 gpm per connection. D5. Systems shall have fire flow capability based on the following criteria: Less than 100 homes – not required 100 to 199 homes – 500 gpm for 2 hours plus maximum day demand at 20 psi minimum More than 200 homes – 750 gpm for 2 hours plus maximum day demand at 20 psi minimum K. Site Layout To 12 VAC 5-590-710 add the following: G. Provide exterior lighting around all major process equipment and controls with luminance ranging from 10 to 20 foot-candles. H. Facilities shall be enclosed by steel security fence. Fence shall provide adequate clearance for maintenance, snow removal and other required activities. Fencing shall be black, PVC-coated (ASTM F668 Class 2b) chain link (8 feet fabric height) with 6 barbed wire strands (3 facing in, 3 facing out) on top. Gateposts shall be 4 inches in diameter and corner posts shall be 2.625 inches in diameter. Provide pad lock per Loudoun Water standard with a shank size of ¼-inch in diameter. I. Provide facility address sign at facility entrance in accordance with Loudoun Water’s standards. J. Building sites shall have bituminous concrete roadways and parking areas equal to 3- inch intermediate (IM1-A) on 6 inches of 21A bedding. A minimum of 3 parking spaces shall be provided. A turnaround area shall be provided for large, dual rear-axle trucks. Roadways to treatment and pumping facilities shall be gated. The gates shall have Engineering Design Manual September 2010 97
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Engineering Design Manual September
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TABLE OF CONTENTS PAGE Chapter 1: L
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TABLE OF CONTENTS PAGE Chapter 4: W
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TABLE OF CONTENTS PAGE Chapter 7: C
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TABLE OF CONTENTS PAGE L. Controls
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Chapter 1: Loudoun Water’s Role C
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Chapter 1: Loudoun Water’s Role A
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Chapter 1: Loudoun Water’s Role T
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Chapter 1: Loudoun Water’s Role 1
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Chapter 1: Loudoun Water’s Role c
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Chapter 1: Loudoun Water’s Role S
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Chapter 1: Loudoun Water’s Role F
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Chapter 2: Administration 2.1 Exten
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Chapter 2: Administration Developed
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Chapter 2: Administration C. Protec
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Chapter 2: Administration B. Bond R
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Chapter 3: Application and Plan Pre
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Chapter 4: Water Distribution Chapt
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Chapter 4: Water Distribution Resid
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Chapter 4: Water Distribution deten
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Chapter 4: Water Distribution d. Wi
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Chapter 4: Water Distribution Figur
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Chapter 4: Water Distribution 5. Co
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Chapter 4: Water Distribution 14. L
Page 57 and 58: Chapter 4: Water Distribution B. Me
Page 59 and 60: Chapter 4: Water Distribution D. Cr
Page 61 and 62: Chapter 4: Water Distribution 7. Pi
Page 63: Chapter 4: Water Distribution 3. Wh
Page 66 and 67: Chapter 5: Wastewater Collection 2.
Page 68 and 69: Chapter 5: Wastewater Collection mo
Page 70 and 71: Chapter 5: Wastewater Collection B.
Page 76 and 77: Chapter 5: Wastewater Collection is
Page 78 and 79: Chapter 5: Wastewater Collection C.
Page 80 and 81: Chapter 5: Wastewater Collection Pr
Page 82 and 83: Chapter 5: Wastewater Collection Ma
Page 87 and 88: Chapter 6: Reclaimed Water Chapter
Page 89 and 90: Chapter 6: Reclaimed Water 5. Adjoi
Page 91 and 92: Chapter 6: Reclaimed Water 13. Valv
Page 93 and 94: Chapter 6: Reclaimed Water 2. Provi
Page 95 and 96: Chapter 6: Reclaimed Water B. Reuse
Page 97 and 98: Chapter 6: Reclaimed Water 6.6 Cros
Page 99 and 100: Chapter 6: Reclaimed Water A. Excav
Page 101: Chapter 6: Reclaimed Water 2. All l
Page 104 and 105: Chapter 7: Community Water Systems
Page 120 and 121: Chapter 8: Community Wastewater Sys
Page 139 and 140: Chapter 9: Sewage Pumping Stations
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Chapter 9: Sewage Pumping Stations
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Appendix A Appendix A: Application
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Checklist for Construction Plans PR
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Sewer - Plan View 1st sub. 2nd sub.
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Item Description Quantity Unit Unit
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Appendix B Appendix B: Wastewater C
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Sanitary Sewer Minimum Core Separat
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I. Introduction The Loudoun County
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C. Approval The easement plat and d
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Appendix D Appendix D: Community Sy
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Community Systems Design Review Pro
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Community Systems Design Review Pro
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Community Systems Project Initiatio
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Community Systems Construction Proc
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Community Systems Construction Proc
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Community Systems Preconstruction C
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I. Corrosion Control All storage ta
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i) The depths of soil samples colle
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Class 2 pipelines in moderately cor
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with cable cutters. Remove the insu
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4. Pipeline station numbers for wir
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a. name of the Corrosion Technician
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voltmeter with a test lead. Obtain
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Table 1 Cathodic Protection Test Da
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Table 3 Linear Continuity Calculati
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Table 5 Field Electrical Isolation
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Appendix F Appendix F: Construction
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Engineering Design Manual - Loudoun Water

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