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  1. MarshfieldTimC

    Sanitary Manhole 'Plumbness' Tolerance?

    I have an 8-foot deep sanitary manhole that was installed by a contractor that was unfortunately installed out-of-plumb. I am unable to find any standards or tolerances for manhole 'plumbness'. Does anyone know how far out-of-plumb is too much for a manhole? Thanks in advance for replies.
  2. MarshfieldTimC

    Oval Concrete Splashpad Jointing

    I have a municipal splashpad project - an oval shaped concrete slab, 6-inches thick. The dimensions of the splashpad are: inner oval (with splashpad jets and lights) is 34' x 42'; and the surrounding oval is 60' x 100'. Does anyone know of any guides or resources to help determine jointing...
  3. MarshfieldTimC

    Wood Truss - Improving strength of Nailed Member Joints

    I recently purchased a 30' x 40' (unfinished) pole shed, and I would like to add a ceiling and insulate it (along with the perimeter walls). The shed was built (in approx. 1990) with 6x6 posts spaced 8' apart, with wood trusses (spanning the 30' width) attached to the posts. The trusses are...
  4. MarshfieldTimC

    Improving Pedestrian Safety, Crosswalks on 4-Lane Urban Street

    I am looking for suggestions to improve pedestrian safety at an unsignalized intersection. The street to be crossed is a 4-lane urban street, 25 mph speed limit. The street was reconstructed 8 years ago and includes curb extensions/bump-outs, safety islands in the center (with in-street ped...
  5. MarshfieldTimC

    Vactor Dumping Pad (for Decanting of Sewer Cleaning Solids)

    I'm searching for a simple design for the 'decanting' of sewer cleaning truck (Vactor) solids. We'd like to dump the Vactor solids onto a containment pad (similar to a concrete slab with curb & gutter around three sides), let the solids sit for a bit, while draining the liquid run-off into the...
  6. MarshfieldTimC

    Consequences of a Deflected Pipe?

    A developer recently installed a new section of sanitary sewer in our City. On one segment of 8-inch PVC sewer (8-feet deep), the pipe has failed a deflection test (5% mandrel gets stuck). We televised the pipe and it looks good, other than a few scratches due to repeated mandrel pulling...
  7. MarshfieldTimC

    Concrete Pipe Sanitary Sewers - To Clean or Not to Clean?

    Our City has many sanitary sewers consisting of concrete pipes. This pipe material was commonly installed between approximately 1950 and 1970. As these concrete pipes age, hydrogen sulfide attacks the wall surface and deteriorates the pipe from the inside, mostly above the water line. My...
  8. MarshfieldTimC

    Curvilinear Sanitary Sewer

    I am considering installation of a curvilinear sewer for a sanitary 'relief' sewer project. The pipe would be approx. 10-inch (HDPE or fusible PVC), installed via directional drilling, approx. 600 lf, no lateral connections, and good slope (more than minimum required slope). The two end...
  9. MarshfieldTimC

    Deep Interceptor Sewer Project - Construction, Inspection, etc.

    Our project includes an extension of an interceptor sanitary sewer. Pipe sizes range from 21-inch to 8-inch ID. The depth will vary between 10-feet and 34-feet, with a majority of the project over 20-feet. I assume much of this will be open cut excavation (with double stacked trench boxes)...
  10. MarshfieldTimC

    Exsiting water main needs a casing pipe

    I have an existing 12-inch water main (buried 8 feet deep and in service) and need to install a casing pipe on this water main under a proposed at-grade railroad crossing. One option is to shut down the water main, remove the existing ductile iron pipe, install a steel casing pipe...
  11. MarshfieldTimC

    Hydrodfracturing a residential well

    My well production has diminished to the point where I need to do something about it. I was getting about 2 gpm, but now am getting 1/3 gpm. The well has 40' of 6" casing, drilled through 30' of clay overburden and 160' of granite below that. I am considering having a local well driller...
  12. MarshfieldTimC

    Venting Interceptor Sewers

    I am looking for information on the proper venting of an interceptor (sanitary) sewer. I have an existing sewer that includes 24" to 36" ID concrete pipe, 6500 LF long and only carries wastewater that is discharged from a lift station (no other connections, no laterals, etc.). There is a vent...
  13. MarshfieldTimC

    Low Clearance of Underground Pipes (Crossing)

    I have an existing 24-inch sanitary sewer that will be crossed by a new 54-inch concrete storm sewer pipe. The new 54-inch storm sewer will cross over the sanitary sewer with minimal clearance (1 to 2 inches, max.). The 24-inch sanitary sewer is old but in good condition (I have no reason to...
  14. MarshfieldTimC

    Proposed Collector/Drop Manhole on Ex. Deep Interceptor Sewer

    I have a project that requires connecting a collector sanitary sewer (12") to an interceptor sewer. The existing interceptor is 60" reinforced concrete and approximately 25' deep. I would like build the proposed manhole as an outside drop manhole. I am considering a poured-in-place...
  15. MarshfieldTimC

    Venting of a Force Main Discharge Manhole

    I am looking for help with venting of a forcemain discharge manhole which is located in a residential neighborhood, so nuisance odors are a big concern. The forcemain enters the existing manhole approximately 18" above the gravity sanitary sewer (outfall). The manhole is presently within the...

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