Engineering Design Manual - Loudoun Water

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Chapter 9: Sewage Pumping Stations shall be arranged so as to independently ventilate all of the wells and/or vaults at the station. Dry well supply and exhaust louvers shall have insect screens. Exhaust air shall be drawn from the lowest floor or area of the structure. Supply air will enter at the top floor or area. No damper shall be used on the exhaust or fresh air ducts, and the screens will be ¼-inch stainless steel. The switches for the operation of the ventilation equipment shall be well marked and located above grade near the entrance doors or hatches. The lighting and ventilation switches on all wet wells shall be interlocking. If 3- phase service is available, the exhaust fan motors shall be 3-phase motors. Time clock switches will be provided to allow a programmed run time of the exhaust fans. There will be no interconnection between the ventilation systems in the wet well and dry well. Dry well entrances shall not be in close proximity to the wet well or generator exhausts. 3. Wet wells ventilation may be either continuous or intermittent. Ventilation, if continuous, shall provide at least 12 complete air changes per hour; if intermittent, at least 30 complete air changes per hour. Wet well ventilation fans and ducts shall be constructed of either stainless steel or fiberglass. 4. Dry well ventilation may be either continuous or intermittent. Ventilation, if continuous, shall provide at least 6 complete air changes per hour; if intermittent, at least 30 complete air changes per hour. 5. Ventilation openings shall be protected with aluminum louvers with bird-screens. O. Water Supply 1. Wherever possible, public water will be extended to the pumping station for wash down and cleanup operations. The water service into the station will be a 1-inch, type “K” copper. A fire hydrant shall be provided on site. The meter will be set as shown in the details of this manual. If public water is not available, a well will be provided at the site. 2. Appropriate cross connection measures shall be used to ensure that no physical connection exists between any potable water supply and a sewage pumping station that under any conditions might cause a contamination of the potable water supply. A non freeze yard hydrant will be installed at the station. A 50 foot long, 1-inch diameter hose and a hose rack will be provided at the control building. When required, restroom facilities will be provided at pumping stations. P. Vaults 1. Access hatches will be located in the vault so as to facilitate the removal of the pump’s, motor and other equipment in the station without disrupting the operation of the facility. 2. All hatches will be aluminum with stainless steel hardware. All hatches will have locking hasps and automatic hold-open arms with safety grates. 3. A fixed or portable hoist suitable for removing the comminutor, pumps and other equipment will be provided at the vault. If a portable hoist is provided, surface mount sockets will be installed at the comminutor vault and pump well. Engineering Design Manual September 2010 148
Chapter 9: Sewage Pumping Stations 4. The valve vault, and flow meter vault will have floor drains. The floor drain will have a “P” trap and will discharge into the wet well. The floor drain shall be installed with a check valve or flapper valve on the end to prevent sewage from entering the structures if the wet well floods. Q. Odor Control 1. Odor control measures must be designed and installed as part of the station. The odor control measures to be used will be determined by Loudoun Water during plan review. 2. All pumping stations shall be provided with an odor control system designed to mitigate odors from the wet well and influent manhole. Different acceptable methods include but are not limited to carbon adsorption (air scrubbing), and chemical addition at the wet well or influent manhole. 3. Pumping stations should be designed to minimize the possible formation of odors by limiting wet well retention times and avoiding high drops for influent sewers, which cause odors to be released. 4. The pumping station design shall include a pad mounted bioxide chemical storage tank and automatic chemical feed equipment to control odors at the force main dicharge. R. Control Building 1. The Control building shall be of brick and block design with pitched roof and wooden roof trusses, to house the generator, electrical, and control equipment. The use of pre-cast or pre-fabricated buildings must be approved by Loudoun Water. 2. Ensure positive drainage away from building at a minimum 4 percent slope. Provide foundation drain. 3. There shall be no exposed woodwork on the outside of the building. The control building exteriors include stone faced block walls or other features to match the surrounding architecture. All exterior woodwork shall have vinyl or aluminum siding. 4. Building finished floor, vault hatches, and all electrical equipment shall be located at least 1 foot above the 100-year flood elevation. 5. Pump room floor shall be sloped to a sump. A sanitary lateral with piping leading to the wet well shall be provided. Building shall be furnished with a service sink with both hot and cold water, outside non-freeze hose bib and toilet stall with waste piped to influent manhole or wet well. 6. A thermostatically controlled heater and exhaust fan sized for the building will be provided in the control building. The exhaust fans shall be adequately sized to cool the heat generating equipment located in the building. The thermostats controlling all HVAC equipment shall be located in an easily accessible area. Heaters shall not be located near exhaust louvers. 7. Floors shall be epoxy coated. Engineering Design Manual September 2010 149
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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
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Chapter 4: Water Distribution B. Me
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Chapter 4: Water Distribution D. Cr
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Chapter 4: Water Distribution 7. Pi
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Chapter 4: Water Distribution 3. Wh
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Chapter 5: Wastewater Collection 2.
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Chapter 5: Wastewater Collection mo
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Chapter 5: Wastewater Collection B.
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Chapter 5: Wastewater Collection is
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Chapter 5: Wastewater Collection C.
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Chapter 5: Wastewater Collection Pr
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Chapter 5: Wastewater Collection Ma
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Chapter 6: Reclaimed Water Chapter
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Chapter 6: Reclaimed Water 5. Adjoi
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Chapter 6: Reclaimed Water 13. Valv
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Chapter 6: Reclaimed Water 2. Provi
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Chapter 6: Reclaimed Water B. Reuse
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Chapter 6: Reclaimed Water 6.6 Cros
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Chapter 6: Reclaimed Water A. Excav
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Chapter 6: Reclaimed Water 2. All l
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Chapter 7: Community Water Systems
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Page 110 and 111: Chapter 7: Community Water Systems
Page 120 and 121: Chapter 8: Community Wastewater Sys
Page 139 and 140: Chapter 9: Sewage Pumping Stations
Page 159: Chapter 9: Sewage Pumping Stations
Page 171: Appendix A Appendix A: Application
Page 175 and 176: Checklist for Construction Plans PR
Page 177: Sewer - Plan View 1st sub. 2nd sub.
Page 180 and 181: Item Description Quantity Unit Unit
Page 183: Appendix B Appendix B: Wastewater C
Page 186 and 187: Sanitary Sewer Minimum Core Separat
Page 189 and 190: I. Introduction The Loudoun County
Page 191 and 192: C. Approval The easement plat and d
Page 193: Appendix D Appendix D: Community Sy
Page 196 and 197: Community Systems Design Review Pro
Page 198 and 199: Community Systems Design Review Pro
Page 200 and 201: Community Systems Project Initiatio
Page 202 and 203: Community Systems Construction Proc
Page 204 and 205: Community Systems Construction Proc
Page 206 and 207: Community Systems Preconstruction C
Page 209 and 210: 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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