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  1. roscoe

    Educational Material on Quality Foundations

    I am getting ready to do the drainage tile and backfill for my basement wall for my hillside home (I am the Engineer and the Contractor)and was planning on using drain rock as backfill, but now I am looking into sand as Oldestguy mentions above and it really makes sense. There are a couple of...
  2. roscoe

    Subsea shut down valve

    Maybe I don't understand the question correctly, but I don't understand the need for a valve on your pipeline. What is the purpose of the valve? Why not just break up the pipeline wall thickness design based on the actual pressure it will see along say 100 km intervals. At the interface joint...
  3. roscoe

    Steel Moment Frame Connection

    I am designing and building a residence less than 2 km from a type A fault (The Hayward Fault). This will be a home constructed in the hills on an upslope lot. The front of the house requires a steel moment frame with two columns W12x31 and two beams W12x87 (one at the 1st story and one at 2nd...
  4. roscoe

    Stiff Clay Subgrade Preparation

    Thanks for your comments. Yes, this clay is very expansive. It is adobe clay which is what is typically found in the San Francisco Bay Area. The project site is at an elevation of 8 feet above mean see level. Thanks again!
  5. roscoe

    Bird Baths/Low Spots in AC Paving

    Thanks for your comments gents! Very helpful.
  6. roscoe

    Bird Baths/Low Spots in AC Paving

    Does anyone have a good method of quality control of "bird baths" or low spots in Asphalt Concrete Paving construction. I am supervising the construction of some roads, and have found some bird baths after the paving was already complete. I would like a method of either preventing it...
  7. roscoe

    Stiff Clay Subgrade Preparation

    We are constructing an AC Pavement sport court (2" AC with 4" base rock). The subgrade soil is stiff, thick adobe clay. The spec calls for scarifying 8 inches of the subgrade, and conditioning to a moisture content that will allow for compaction to the specified (90% MDD). Based...
  8. roscoe

    AC Parking Lot - Grind/Deep Lift/Overlay

    Thanks for your comments and the link to ARRA. We are already set to do deep lifting this Friday, and seal coat next week. I look forward to trying the recycle-in-place method on a future project. best regards.
  9. roscoe

    AC Parking Lot - Grind/Deep Lift/Overlay

    Due to cost constraints, we have decided to proceed as follows: 1) Eliminate the 2" grind and 2" overlay 2) With the cost savings from elimination of the grind and overlay, we are going to be able to deep lift almost all of the badly cracked areas. 3) Then we will do a seal coat...
  10. roscoe

    AC Parking Lot - Grind/Deep Lift/Overlay

    Gents, thank you for your comments. I talked to the Contractor, his concern regarding the mix-in-place recycle method is that the existing AC in the severely cracked areas will not pulverize into small enough aggregate and it will take a lot of work to remove the large pieces of AC from the...
  11. roscoe

    AC Parking Lot - Grind/Deep Lift/Overlay

    I am supervising a job which has as part of the scope of work the re-surfacing of an old AC parking lot. The existing parking lot is approximately 4" of AC over about 6" of base rock. The subgrade soil profile is thick, firm adobe clay. There is a lot of aligator cracking in the...
  12. roscoe

    Cracks on Exterior Bearing Walls

    What is the wall made of? Are the cracks in the stucco? When building new single family homes it is common practice to install the roofing material before doing the stucco(especially for heavy Spanish Tiles).
  13. roscoe

    Expanding an existing pond

    Can you excavate another pond adjacent to the existing pond and then gradually fill the new pond and eventually join the two? Since you are concerned about the "marine" life of the pond, dredging the existing pond deeper doesn´t seem like a good idea because it would probably kill a...
  14. roscoe

    Construction Cost Estimating

    A lot depends on where you are located. Here in California you would probably have to include costs for seismic upgrades, especially if you are adding HVAC equipment to the roof. A good commercial estimating source is Saylor http://www.saylor.com/ regards
  15. roscoe

    Pipeline C.P. Design

    I remember that we used DNV RP B401, and although there was no breakdown factor explicitly called out for FBE, we used the most similar coating (I seem to recall DNV lists a rubberized coating system, I don´t have a copy of DNV in front of me). Since FBE is better than that coating system, the...

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