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  1. civilsid

    quonset arch section properties

    I was approached by a client to design a foundation for his U.S. Buildings quonset hut shaped garage. Our local municipality requires structural calculations in addition to the plans. U.S. Buildings told me it would be an additional $2,000 for the calcs. Of course this is completely...
  2. civilsid

    best books for learning structural eng?

    I am a civil PE that happened to pass the CA Seismic exam but know very little about structural engineering- I took two semesters of statics way back in college. I have been getting multiple calls for designing simple structures such as single floor steel frame buildings, garages, carports...
  3. civilsid

    derivation of CN's?

    I am working on a residential subdivision approx. 100 acres in size and all lots are going to one acre or larger. I am using TR-55 to develop my Q's and notice that the CN for residential districts one acre in size or larger is CN = 68; all soils are Type "B" for this application. Many...
  4. civilsid

    ASTM 5921 supporting material

    I am using the ASTM 5921 "Standard Practice for Subsurface Site Characterization of Test Pits for On-Site Septic Systems". I think I am doing a reasonable job of flailing through the soil characterization process but I would like to get some feed back from the engineering community regarding...
  5. civilsid

    need info for Hamilton Dial-A-Torque and Mutoh drafting machine

    I just purchased a used drafting table which is called dial-a-torque and is made by Hamilton Industries. It has a Mutoh drafting head and I would like to get everything working right. I have the table working correctly as far as the legs up and down and table rotating forward and back. I took...
  6. civilsid

    BOD aging vs. SRT?

    Is there a direct relationship between what is commonly known as "Solids Retention Time" (the age of the suspended solids) and the BOD sludge age? I had some calculations go very awry because I used the age of the BOD and not the SRT. If they are not the same, what gives?
  7. civilsid

    inground swimming pool inquiry

    I am in NW Arizona and remember working for an engineer several years ago and we got a few calls from home owners that had inground swimming pools begin to float on them, obviously from the build up of hydrostatic pressure. I have never heard of this happening back east (western NY) where the...
  8. civilsid

    Can anyone explain Schultz-Hardy rule?

    Civil P.E. study question I ran into but would like someone experienced to translate this into English. It is somewhat confusing to me: If 0.1 mol/L of sodium is sufficient to destabilize a colloid, then which of the following doses will be equally effective? 1.00× 10 ?4 mol/L of alum...
  9. civilsid

    Using "Peck's Method" for design pressure

    I'm studying for my Civil P.E. and ran across a question that said to use Peck's method to find the maximum design pressure. None of my reference material says anything about this method and an internet search has also been fruitless. Any good references would be helpful. Also looking for any...

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