Sewer & Storm Drain Systems Institute for Facilities Management Sewer & Storm Drain Systems Jay W Becker, PE 1 Course Overview Campus Sewer and Drainage o Sanitary Sewer System o Storm Drain System o Understanding the differences 2 Sewers versus Storm Drain The sanitary sewer system takes water from INSIDE the buildings (sinks, showers/tubs, toilets, washing machines, etc) and sends it to the waste water treatment facility The storm drain system takes water from OUTSIDE the buildings (rain, irrigation) and sends it untreated to the local water ways. 3 APPA Institute Orlando Sept 2016 1
Sewer & Storm Drain Systems 4 MS4 (Municipal Separation of Storm and Sewer Systems) 5 Sanitary Sewers Basic overview of building and campus applications 6 APPA Institute Orlando Sept 2016 2
Sewer & Storm Drain Systems Residential Sanitary Sewer System 7 Residential Sanitary Sewer System 8 Municipal Sanitary Sewer System (portion) 9 APPA Institute Orlando Sept 2016 3
Sewer & Storm Drain Systems Sanitary Sewer Lift Station 10 Sanitary Sewer Controls Manholes and Cleanouts 11 12 APPA Institute Orlando Sept 2016 4
Sewer & Storm Drain Systems Oil Water Separator 13 Storm Drains Basic overview of campus applications 14 Storm Drains Designed as a flood control system to allow water from heavy rainstorms to flow quickly to our waterways to avoid flooding o Rainwater can pick up pollutants as large as shopping carts or as microscopic as pesticides and fertilizer and flush it all into our waterways damaging the fish, plants and other living things in our ecosystem 15 APPA Institute Orlando Sept 2016 5
Sewer & Storm Drain Systems Storm Drain Systems Designs include retention and detention systems to control (limit and restrict) outflow to levels that increase with more sq ft of hard surface (pavement and roofs) 16 Storm Drain Keep it clean Storm water runoff is untreated, it is extremely important to keep pollutants out of waterways. o Particular pollutants of concern include: Litter Floatables (leaves, paper, etc) Motor Oil Metals from brake dust (use a commercial car wash where the washwater is recycled). Pet waste Fertilizer Pesticides Sediment, silt (stormwater protection program) 17 Clean Water Act & Storm Drains Establishes ambient and point source effluent standards and permit requirements for water pollutants, including sources that discharge directly to a waterway or public sewer system (controls) MS4 (Municipal Separation of Storm and Sewer Systems) 18 APPA Institute Orlando Sept 2016 6
Sewer & Storm Drain Systems Storm Water Management (MS4) Minimum Control Measures o Public education and outreach o Public participation o Illicit discharge detection and elimination o Construction site storm water runoff control o Post construction storm water management o Pollution prevention (good maintenance) 19 Spill Prevention Controls & Countermeasure Plan Prepare and implement plan (develop plan before beginning operations) Operating procedure to avoid spills Control measures to keep oil from reaching navigable waters Countermeasures to clean up or mitigate impacts of spills Training and inspections must be part of plan Secondary Containment is a must have 20 Spill Prevent Controls & Countermeasures Plan Update as facility changes and a formal review every 5 years. Registered PE must certify and sign plan (exceptions apply self certification for small sites <10,000 gallons). Special secondary containment provisions for oil-filled equipment (transformers). 21 APPA Institute Orlando Sept 2016 7
Sewer & Storm Drain Systems Storm Sewer Protection 22 Storm Water Outfall 23 Spill Protection Measures 24 APPA Institute Orlando Sept 2016 8
Sewer & Storm Drain Systems Catch Basins 25 Catch Basin Protection Temporary and Permanent Controls 26 More Storm Water Controls 27 APPA Institute Orlando Sept 2016 9
Sewer & Storm Drain Systems Spill Control Measures 28 Detention and Retention Systems The main difference between a detention and a retention basin is whether or not it has a permanent pool of water like a traditional pond. The water level is established by the low flow orifice. Most of the time the orifice is part of a metal or concrete structure called a riser. A detention, or dry, basin has an orifice level with the bottom of the basin so that all of the water eventually drains out and it remains dry between storms hence, a dry basin. Retention basins have a riser with an orifice at a higher point so that it retains a permanent pool of water. 29 Detention (Dry) 30 APPA Institute Orlando Sept 2016 10
Sewer & Storm Drain Systems Retention (wet) 31 Underground Retention 32 Various Controls 33 APPA Institute Orlando Sept 2016 11
Sewer & Storm Drain Systems Permeable Surfaces 34 Keys Keep Sanitary Sewer contained and protected Keep Storm Drain open and protected Ongoing inspection and maintenance - verify 35 Jay W. Becker, PE Manager of Mechanical Systems & Facilities Engineer University of Puget Sound jwbecker@pugetsound.edu 36 APPA Institute Orlando Sept 2016 12