Sewer Flow Testing, Smoke Testing and Manhole Inspection
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1 Sewer Flow Testing, Smoke Testing and Manhole Inspection March, 2013
2 Primary Purposes of Study Determine Infiltration and Inflow Collect Field data about this area of the Collection System Start an Inventory of Manholes and other structures.
3 Study Area was Chickasaw Area of Homer Glen Area starting to see increases in growth Mid s construction Can area sustain added growth on top of older infrastructure?
4 Project Divided into Three phases Flow Monitoring to detect I & I Smoke Testing to show infractions and areas needing remediation Manhole Inspection and Inventory
5 Phase I: Flow Monitoring Chosen to narrow down problem area. Map (next slide) shows area Flow Monitor 1 all flow will pass this point. Flow monitor 2 will monitor flow from North area into the larger area. Flow totals of monitors compared for analysis
6 " 140'-10" CH '-8" CH '-10" CH CH-714 CH-870 CH CH CH CH-818 CH '-8" DERBY RD. 240' 8"PVC 195'-8" CH-722 CH CH '-8" CH-709 CH CH '-8" '-8" CH CH '-8" '-8" '-8" CH-806 CH CH '-8" '-8" RED DR CH-705 CH-824 CH '-8" CH CH CH-807 CH CH '-8" '-8" 115'-8" 317'-8" CH CH CH '-8" CH '-8" '-8" '-8" CH CH CH '-8" 95'-8" CH CH-826 CH CH " MONAGHAN RD. 230'-8" CH " LIFT STATION & WET WELL CH-880 CH '-8" '-8" CH-834 CH-821 CH FORCE MAIN CH-829 CH '-8" 225'-8" 150'-8" CLEANOUT '-6" '-8" 194'-8" CH CH-828 CH CLEANOUT CH CH '-8" " PIPE, PVC CH CH '-8" '-8" CH '-6" CH CH '-8" CH CH CH CH '-8" 400'-8" CH CH CH CH CH CH-853 CH PARKER RD. 115'-8" PARKER RD. PARKER RD '-8" DIP '-12" CH-852 CH-851 CH-662 CH '-8" CH '-12" CH '-8" CH CH " '-8" DIP ARCTIC CT. CH-866 CH CH-856 CH '-8" 282'-12" CH-751 CH CH-753 CH CH CH CH '-8" 340'-10" 305'-10" WEST RED COAT DR CH '-8" '-8" CH '-8" '-8" 275'-10" CH-847 CH CH '-8" CH-749 CH '-8" FORCE MAIN CH-861 CH-854 CH-859 CH-761 CH-763 CH-862 CH CH-748 CH-760 DR '-8" SILVER FOX DR. CH '-8" CH '-10" '-8" '-10" 382'-10" 350'-8" 382'-10" 220'-8" CH CH CH CH CH '-8" CH-678 CH CH '-8" CH '-8" CH '-8" CH CH-758 CH '-8" '-8" CH CH CH '-8" '-8" '-8" CH '-8" CH CH CH '-8" '-8" EAST RED COAT DR. 302'-8" 400'-8" 225'-8" 173'-8" 300'-8" 215'-8" CH-770 CH-771 CH-872 CH CH-584 CH-769 CH CH CH-738 CH CH '-10" '-8" '-8" CH CH-609 CH-626 CH CH-628 CH-629 CH-630 CH-620 CH-621 CH CH '-8" FOX HILL DR. 225'-8" 225'-8" 245'-8" RED FOX CT. 385'-8" 350'-8" 250'-8" CH CH CH '-8" '-8" '-8" '-8" CH '-8" CH-625 CH-634 CH '-8" CH CH '-8" CH '-8" '-10" CH '-8" CH-792 CH CH CH CH CH '-8" CH '-8" CH-618 CH CH CH-799 CH '-8" 180'-8" CH '-8" '8" '-8" CH '-8" 240'-8" CH-660 CH CH '-10" 295'-8" 110-8" 200'-8" CH-605 CH CH-798 CH CH CH CH '-8" CH CH CH CH '-10" 400'-10" CH-657 CH CH-655 CH CH CH CH '-8" CH CH '-8" 355'-10" CH CH '-10" 120'-10" '-10" CH CH-788 CH CH CH '-8" '-10" 135'-10" CH '-8" NORDIC CT. 167'-8" 139'-8" KIT LN " SILVER FOX DR. 240'-8" DIP SILVER 3 FOX 230'-8" GRAY LN. 252'-8" PARKER RD. 270'-8" DIP KIT LN. 180'-8" DIXON-WAY DR. 305'-8" DIXON-WAY DR. 155'-8"180'-8" 204'-8" 122'-8" 144'-8" DIP 238'-8" DIP 50'-8" 216'-8" 388'-8" BLACK FOX LN. ARCTIC LN. 200'-8" 131st ST. 131st ST. 131st ST. 131st ST. 131st ST. 131st ST. 131st ST. 131st ST. 131st ST. 260'-8" LN. TRAIL 95'-10" MOORFIELD CT. MEADOW HILL LN. FOX 120'-10" 213'-8" 100'-10" 205'-8" 143'-10" 5 130'8"PVC 130'-8" 200'-8" 400'-8"PVC 250'-8" 227'-8" RED DR '-8" FOX BURROW LN '-10" 150'-10" 8 200'-8" 345'-10" BRIAR PATCH LN '-8" 120'-8" 240'-8" 120'-8" 290'-8" FOX HILL DR. PATCH LN '-8" 260'-10" 155'-10" 120'-10" 268'8"PVC HUNT MASTER LN. HUNT MASTER LN. FOX HILL CT. 200'-8" HUNT MASTER LN. 290'-10" 360'-10" DERBY RD. 175'-6" 140'-8" SOUTH RED COAT DR. SOUTH RED COAT DR. 229'-8" FOX HILL DR. 348'-12" 200'-6" 285'-8" 125' 10" 135th ST. DERBY DR. DUBLIN DRIVE DUBLIN DR. DUBLIN DR. CHOCTAW TRAIL CHOCTAW TRAIL CHOCTAW TRAIL 125'-10" 156'-8" 175'-10" 330'-8" KERRY LN. 335'-8" 211'-8" 6" SER. HEDGE APPLE DR. 221'-8"
7 Flow Monitoring set for anticipated wet Spring of day initial study period Data collected from monitors twice each week. Rain gauge installed in area to monitor rain events. Flow totals of monitors compared to rain events for analysis
8 Flow Monitor #2 installed
9 Flow Monitor #2 installed Installed from street level with spring loaded ring inserted into upstream side of pipe. Sensor on ring measures depth of flow and velocity of flow Data collected by a data recorder over a set time period, then downloaded to laptop computer Software allows for data periods to be added in for total flow calculation
10 Flow Monitor #2 installed
11 Flow Monitor #1 installed Installed from street level with spring loaded ring inserted into upstream side of pipe. Needed extension on installation tool due to depth. (next slide) Sensor on ring measures depth of flow and velocity of flow This pipe is a 12 pipe.
12
13 Flow Monitor installation Had the manhole been much deeper, confined space equipment would have been needed. All precautions would have needed to be taken Always use experienced staff.
14 Preparing for entry into a manhole
15 Flow Monitoring Rain gauge used has recorder that uses the same programming as the flow monitors Uses a tipping bucket that records as little as.01 of rain. Easy to line up the timelines of each device for comparison
16 Flow Monitor Results 05 Spring did not have a lot of rainfall Study was extended another 30 days. One major rainstorm allowed for.91 inches in 24 hours and data showed some correlation of rainfall to increased flows in the Sanitary sewer.
17 Rain Gauge Results show spike on the 15 th to show start of project. No significant rainfall during time period. Rainfall amounts -- Scant rainfall indicated Total Rainfall of 3.51 inches for 60 days
18 Flow Monitor Results on site # 2 Depth of flow Flow Velocity GPM Rain in Inches
19 Flow Monitor Results on site # 1 Depth of flow Flow Velocity GPM Rain in Inches
20 Flow Monitor Results No conclusive results to show increased flows with rain events on Monitor #2 No time period where rain amounts of over 1 in 24 hour period.
21 Site # 1 Flow Monitor Results Average flow level of 4.1 Flow Rate of 112 GPM throughout time period Shows Possible infractions of I & I.
22 Site # 2 Flow Monitor Results Average flow level of.05 Flow Rate of sporadic throughout time period Did not show possible infractions of I & I.
23 Flow Monitor Results Evidence did show on # 1 Monitor that there was some increase in flow with rain events This prompted further study by using Smoke Testing to locate Problem areas.
24 Phase II: Smoke Testing Total Length of pipe examined: 26,269 feet Non-Toxic liquid smoke used Neighborhoods notified by water bill mailer and door tagging area 48 hours ahead of testing Fire Department notified each day to prevent false calls
25 Phase II: Smoke Testing Program designed to check: Inflow from storm drain cross connections Roof Connections Faulty manholes Sewer Pipe problems Foundation Drains
26 Smoke Testing Procedure: Temporarily block off sewer pipe at lengths not exceeding 1000 feet Introduce smoke into sewer for no longer than 3-5 minute intervals. Photograph infractions and document event
27 Smoke Testing
28 Smoke Testing Water Service Smoking!
29 Smoke Testing Manhole lid leaking
30 Smoke Testing Possibly a leak on the Sanitary Main
31 Smoke Testing Private Home with a leak
32 Smoke Testing Private Service Line with potential leak
33 Smoke Testing Several Manhole Lids leaked
34 Smoke Testing Several Manhole Lids leaked
35 Smoke Testing For the 26,269 feet smoke tested: 35 infractions (average one infraction every 750 feet) for a system installed in the 1970 s 25 manhole lids 3 leaks from possible broken mains A couple of private line leaks
36 Phase III Manhole Inspections Carried out during the Smoke testing 144 manholes inspected and inventoried Data placed in a database for the Utility Photos of every Manhole
37 Phase III Information Collected for database LOCATION OF MANHOLE Street Manhole # Cross Street X,Y Coordinates (Measured from C/L of Street, Alley, Hydrant, etc) X: Y: GPS Coordinates Northing Easting Sewer Type Sanitary Storm Combined Other Site (street, parkway, alley, etc)
38 RIM Phase III Information Collected for database Rim Grade Flush High Low Picture # Rim Grade Adjustment (in inches) LID Cover Type Standard Vented Storm Grate Other Water Tight Gasket Lid Type Round, Solid Round Storm Grate Beehive Rectangle Grate Lid Dimensions (in inches) FRAME # of Holes Frame Adjustment Mortar Brick Concrete Ring Metal Ring Frame Adjustment (in inches) Seal at Frame Adjustment Good Fair Poor MANHOLE Construction Concrete Brick/Mortar Precast Concrete Poured in place Shape Round Square Rectangle Manhole Diameter Steps Safe Unsafe None Manhole Cone Offset Centered Flat Slab Wall Condition Good Cracked / Gaps Missing Sections Collapsing Observed Infiltration (yes/no)
39 Phase III Information Collected for database BENCH Bench Good Cracked Repair Remark Bench Condition Mud / Sand Mineral Deposits Roots None TROUGH Trough Good Cracked None Trough Condition Mud / Sand Mineral Deposits Roots None Pipe Material Clay Concrete PVC Other Depth from Rim to Trough Depth of Water in Trough Observed Flow Fast Medium Slow None
40 Evidence of High Water Mark (measure from Rim) Phase III Information Collected for database Vault Diagram: Inlet/Outlet pipes N o r t h **Diagram the Manhole Number of Inlets Size of Inlets #1 #2 #3 #4 Number of Outlets Size of Outlets #1 #2 #3 #4 Comments:
41 Phase III Information Collected for database Include Pictures!! These can become part of the database
42 Phase III
43 Phase III
44 Phase III
45 Sewer Flow Monitoring, Smoke Testing, Manhole Inspections and Inventory Conclusions: The Flow Monitoring provided evidence of I & I. The Smoke Testing helped pinpoint the infraction locations The Manhole Inspection and Inventory provided a cost effective way to record the field data.
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