Sewer Manhole Rehab. Jack Keys Inspection Services & Collection System Supervisor Southern Clinton County Municipal Utilities Authority

Transcription

1 Sewer Manhole Rehab Jack Keys Inspection Services & Collection System Supervisor Southern Clinton County Municipal Utilities Authority

2 What You Need To Start Your Manhole Rehabilitation Program As-Built drawings with specific manhole ID numbers Follow your Confined Space Program when entering manholes Digital Camera for documentation Checklist for manhole defects to categorize all aspects of the manhole Develop list of available contractors who can perform rehab where needed Historical data from upstream areas to help prioritize the manhole rehab Hydrogen sulfide levels if corrosion is evident Vendors who can supply you with what products you will need for the repairs Budget an annual amount of repairs and stick to it, be realistic Maintain an annual contact with your local road commission or DPW so you can stave off future problems like buried manholes from road projects Update your records whenever you rehab your system NAASCO has standards for manhole rehab if your facility needs them

3 So Let s Begin What We Have Discovered Since Investigating Our Manhole Structures

4 Manhole underwater in wetlands without inflow dish. We discovered vandals took it out and threw it over the hillside.

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6 Note the fine sand washing in under the casting Inflows under casting washing out fine particulates

7 No adjustment ring or cement used when casting was set, we discovered this one during the last 100-year rain event

8 Sometimes a casting is discovered missing...

9 ... that is until you look in the manhole. This storm manhole was made too wide for the casting and over time erosion allowed it to collapse into itself.

10 Note Narrow Throat In Channel.

11 Low Discharge Invert.

12 Note Improper Flow Channel That. Allows Solids To Accumulate

13 High pressure gas main installed through a storm manhole. Why? Note corrosion on side of gas piping. This was removed once we informed the gas company of this situation.

14 Buried Manhole Structures This is why GIS mapping is so important. You need to keep track of all of your structures so they do not get buried like this one did. Roadways get updated annually.

15 A landscaper only bumped the casting while backfilling, of course we didn t find out until a 100- year storm event.

16 . Typical Manhole Adjustment 1980

17 These adjustment bricks were discovered leaking during a 100-year storm event.

18 Manhole Defects Improper Adjustments

19 It wasn t enough to use cement blocks from a house that was torn down, but they used broken cement and asphalt for adjustments also.

20 Let s see, mix Portland Cement with sand and gravel, except in this case the forgot the cement.

21 Manhole exposure to the elements

22 Lined Interceptor With The. Casting Broken Off - Vandals

23 . Vandalism

24 Pipe Stub Blown Into Manhole From High Groundwater Table A 4-foot 8-inch PVC Pipe Pushed Back Into MH Washing Over a Yard of Gravel Into Flow Channel

25 Interceptor showing H2S corrosion

26 Time will wear down a manhole and casting, hydrogen sulfide gas will destroy it 5-times faster

27 Excellent reason to follow confined space entry procedures when entering a manhole - This manhole to be Rehabbed In 2014

28 Severe H2S corrosion in a manhole. That is not a bar stretched across the base of the manhole, but the bottom O -Ring.

29 8-Year Old Precast Manhole

30 This is what a concrete manhole looks like after 8 years of H2S attack of ppm 8-year old manhole with H2S levels of 100-1,200 ppm replaced with a ConShield Manhole

31 ConShield Manhole We ran into a problem when we replaced our original structure with this H2S impervious manhole was installed. We discovered our ferric chloride (odor control) had a design flaw that would overfeed at times, which caused the formation of hydrochloric acid.

32 H2S Corrosion 10-Year Old Manhole H2S Readings from as low as 10 ppm to a high of over 600 ppm

33 8-Year Old Manhole / 6-Inch Forcemain 18,000 gpd

34 ph of concrete measured at 0.5 Thiobacillus Bacteria Thriving at flow line. High BOD, Ammonia, FOG.

35 OdaLogger Meter for Hydrogen Sulfide Gas

36 SCCMUUA OdaLogger In The Field WE TRY TO MAINTAIN THE ODALOGGERS AT HALF THE DISTANCE TO THE BOTTOM

37 SCCMUA Homemade Meter Hangers

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41 OdaLogger FM Discharge Lift Station Flow Basins H2S Avg. H2S Maxium Daily Flows* FM Size- Length Flow Type New/Old/Mi xed H2S can be detected by the public around 7 ppm. The Threshold Level Value is set at 10 ppm. Worker health level 100 ppm Over 300 Immediately Dangerous to Life & Health LS# ppm 141 ppm mgd 6" - 2,066' HDPE New LS# ppm 67 ppm mgd 4" - 631' HDPE New LS# ppm 90 ppm mgdmetered 8" - 6,940 HDPE New LS# ppm 59 ppm mgd 4" - 1,250' HDPE New LS# ppm 2 ppm mgd 4" - 336' HDPE New LS# ppm 7 ppm mgd 4" - 50' HDPE New LS# ppm 92 ppm mgd 8" - 1,581' HDPE New-Joint MH 203

42 Wastewater LS & FM Field Sample Results Location: ph Temp C Field D.O. Dissolved Sulfides LS # LS # LS # LS # LS # LS # Ammonia Nitrogen: 5-Day BOD Lab Sample Results Total Suspended Solids Total Kjeldahl Nitrogen 33.5 mg/l 143 mg/l 172 mg/l 43 mg/l 22.6 mg/l 166 mg/l 228 mg/l 39 mg/l 18.2 mg/l 259 mg/l 98 mg/l 48 mg/l 30.8 mg/l 255 mg/l 120 mg/l 46 mg/l 38.8 mg/l 251 mg/l 122 mg/l 58 mg/l 26.4 mg/l 204 mg/l 128 mg/l 46 mg/l 26.3 mg/l 489 mg/l 180 mg/l 59 mg/l 30.9 mg/l 243 mg/l 63 mg/l 51 mg/l 40.9 mg/l 1,197 mg/l 98 mg/l 60 mg/l 52.8 mg/l 246 mg/l 278 mg/l 69 mg/l 37.0 mg/l 170 mg/l 60 mg/l 52 mg/l 39.5 mg/l 216 mg/l 124 mg/l 56 mg/l

43 CHEMets Sulfide Testing

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45 ph Papers

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47 This was the standard design for an external manhole drop pipe connection. Over time it separated and fractured the encased drop pipe.

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49 Manhole without a flow channel or bench, discovered when performing annual cleaning and televising. Repaired by Lennon Sand & Gravel 2011

50 . Another Interceptor With An Improper Flow Channel

51 Not how you bring pipes together in a manhole structure.

52 Pipe Installed Lower Than Downstream Pipe

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56 Polycrete Manhole Even A New Manhole Can Leak As Shown Here, That Is Why Inspecting Everything Is Critical

57 Always inspect your manhole structures. A crack today will cost you hundreds of dollars later between rehab and infiltration costs.

58 Past & Present Do Not Let 1 Problem Stop Your Investigation, Keep Looking All Around

59 Rehab Methods Solutions Rehab Techniques Better Ideas

60 No-Flow In-Flow Dish in use We installed several hundred in key storm flow areas, as well as major intersection and around gas stations to stop any spilled petroleum products into the sewers. Our record is 3 for 3 on gas spills; and 2 for 2 in wetlands to prevent flooding into our manholes. Inexpensive, easy to install. Average life is about years depending on traffic conditions.

61 Broken Casting Rebuilt Using a 3-M 2-Part Epoxy

62 . Manhole Demo Testing a Joint Sealer

63 Oakum to quiet down those rattling covers USA Bluebook

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65 After injecting SealGuard to stop leaks

66 New MH Liner Installed Into Existing Major Intersection Instead of Excavation USA, Inc.

67 How Manhole Insert Liners Work

68 1995 FIBERLINERS INSTALLATION.

69 FiberLine Lined Manhole

70 PRELIMENARY MANHOLE PREP FOR LINING.

71 FINAL PRODUCT STILL. WORKING AFTER 18 YEARS

72 PANELS WERE USED FOR THE BENCHES

73 How to replace old/missing Internal Drop Pipes for residential or commercial properties. We use these as a last resort always preferring the traditional wye connections.

74 Another Good Method For Sealing MH Joints Gator Wrap by Sealing Systems, Inc.

75 . CRETEX WRAP External Joint Sealer Which Can Be Use For Round, Arched, Elliptical, And Culvert Pipe

76 PEACEMAKER BRAND ODOR CONTROL ROOF VENT FILTERS.

77 Odor Canister on Roof Vent

78 At large lift stations we have installed 12 Carbon Cannisters to help control odors.

79 We use 4 & 6 odor canisters on Air Relief Manholes & at smaller lift stations with success to control sewer gases.

80 Bay Products Air Lift Station

81 Vortex manhole insert being installed Installed by Zito Construction / C2AE Municipal Engineer

82 Flows go down around the main shaft pulling air down the center column and injecting it in the bottom sump

83 Our Vortex Manhole Works Even With All 3 Pumps On IPEX

84 Do you have days where it seems that you are drowning in your work?

85 10-Year Old Raven AquaPlex Hand Applied Epoxy We Contracted With Plummer s Environmental Services To Apply This Product To Over 420 Manholes. This Was A Successful I/I Reduction Program In The LS102 Flow Basin.

86 Internal Chimney Seal

87 Double Chimney Liner

88 SPECIAL CHIMNEY LINER FINAL PRODUCT THIS WAS INSTALLED AT THE DEWITT MEIJERS WHERE THEY WOULD PILE UP SNOW FROM THE PARKING LOT.

89 UGT Adjustment Ring

90 UGT Adjustment Rings / Grades & Final Product - Installed In 2005

91 External Casting/Adjustment Ring Seal Sealing Systems Incorporated

92 Cretex External Seal

93 Raising up buried manholes along roadways step one take it down to good structure or cone section LadTech Rings

94 Installing grout rope along the bottom of the ring s to seal the rings for I/I seal

95 Step two install rings to needed grade

96 Setting Final Grade Before Replacing Casting LadTech Manhole Adjusting HDPE Rings

97 Ease of use, carring 8 of adjustment all at once.

98 Final product with little restoration needed

99 Cementious Spray on Liner

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101 FLEXSEAL INSTALLED IN SCCMUA PARKING LOT.

102 Polycrete Manhole Structure 2005

103 Polycrete Adjustment Rings

104 flowline for manhole from the outside.

105 Flow channel & bench as seen from inside structure

106 2012 Joint Sewer Rehabilitation Project in DeWitt Charter Township. H2S Corrosion resistant manholes.

107 Spray-On Epoxy Repairs.

108 Sealing Lift Station Wet Well to Prevent Future Corrosion Issues E.T. MacKenzie Companies

109 We used the epoxy spray liner on our valve/by-pass vault

110 And we also used it in our meter vault to protect it from any possible future corrosion

111 Close-Up View of Raven Spray Liner As Applied to LS#102 FM MH Before Rehabilitation After Rehabilitation Applied by Plummer s Environmental Services

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114 Concrete Plug for Manhole Rehabilitation

115 Corrosion in concrete pipes with H2S exposure From American Society of Civil Engineers (ASCE), Manual 92, page 26, manhole inspection H2S ppm 1 concrete pipe 2 concrete pipe 0.1 ppm 70 years 200 years 1 ppm 45 years 90 years 10 ppm 10 years 20 years 20 ppm 5 years 10 years

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118 DeWitt Meijer's Demo This area is the designated snow piling area for their parking lot.

119 . Sealed Chimney To Prevent I/I

120 . Final Manhole Product

121 Two Forcemains Causing H2S Corrosion In MH

122 Quadex Spray-On Cementious Lining.

123 . Finished Manhole Product

124 Sherwin. Williams Epoxy Lined Manhole 2012

125 Directional boring project along Airport Road into new Polycrete Manhole USA performed Open Trench / Directional Boring / Pipe Bursting / CIPP Lining / Manhole Replacement / Manhole Monolithic Liner all on this same project in 2005.

126 CIPP through existing manhole structure 2005

127 Sorry Norton, Our Game Style Has Changed.

128 How about a grilled cheese sandwich using Colby Longhorn Cheese and thin sliced Pepperoni, ½ tsp of raw sugar on cheese side next to the Sour Dough Bread, with a Famous Dave s Sweet N Hot Pickle Slice.