An RSF has been operating for 20 years. It's for a neighborhood system and treats an average of 10,000 metered gals/day. We took it offline for work on the tank and hauled away the sewage. Before the work, the sand filter lab results had been taking both BOD and TSS from around approx 200-300...
A client bought a bunch 3ft diameter HDPE corrugated-out/smooth-interior pipe and a shop-fab 3ft elbow joint so they could build an HDPE catch basin and the discharge line that basically looks like an elbow. This was their idea before I came in and their goal was to intercept and divert runoff...
Hello, I'm looking to clean up some old permits of a Gymnasium and an Auditorium at a boarding school. The school has a centralized wastewater disposal system just for themselves. The state's rules on wastewater demands mirrors the values of the Uniform Plumbing Code Table H201.1(4) and the...
If you have add a fall protection point on a steel frame and you check it with LRFD... Does the anchor point become a live load that needs to get factored like a regular live load? Or is the 5000# OSHA number already a factored number plugged into the dead/snow/live load equations without any...
Curious how cracks in 1-hr rated walls are viewed by the industry. I'm not aware of language about having to repair a hairline crack in a rated wall. It would seem that an open crack with some measurable width to it (lets say 1/32" or greater) would need to get patched to maintain the wall...
Interested in hearing experiences putting a new pump on existing infrastructure and minor losses. i've got a system that i just can't explain at this time as to why we're not getting twice the flow from. The sole source pump distributor apparently doesn't comp system curves when they recommend...
i heard through the grapevine of a project where infiltration open-bottom parabolic storm chambers were installed near a new building. The chambers were above the 1:1 influence zone, but there is a theory being floated around that the soils heaved up from below into the chambers and are causing...
More and more we're having contractors who want to use this admixture (at additional cost) for slabs-on-grade. A little background first for curious people less familiar... The product in the region is called Barrier 1 and it gets batched into the concrete. the concrete tester takes a photo of...
Came across a project in new england, where the mason completely rebuilt some 7ft tall triple-wythe brick masonry piers with 150+ yr old bricks using type N mortar. it is common knowledge that this is a no-no if it were a repointing job with lime mortar behind... but, most of the references...
I've got a client who doesn't want to put handrails on some exterior stairs with a 3 ft grade change to get to a fenced garden area. These stairs are not a "means of egress" for the building per the IBC. The question boils down to "if you build stairs that isn't governed under Chapter 10, does...
i'm looking at adding culverts to a seasonal stream to make some road improvements. The state is requiring the culverts have a minimum of 18" of stone inside the bottom of the culvert so there is a natural stream bed. we would like to accomplish this with 36" or perhaps 42" Corrugated Metal...
every time i've dealt with shot rock in structural areas, all the shot rock has been (or was specified to have been) excavated out and backfilled with structural fill. interested if anybody has had experiences with leaving it in intentionally. scenario being that the road access is needed now...
i'm having trouble figuring out if there are reasons out there to specify one masonry control joint material over another one. i haven't dug very deep on this but what i have seen from manufacturers is this... we sell synthetic rubber CJs and they are good for "A" and "B"... or we sell pvc CJs...
Have a small community water system with an existing atmospheric horizontal capsule-shaped or pill-shaped 8,000 gallon FRP tank. We're doing some upgrades to the distribution system and want to include adding a 2" penetration to make an overfill line for the storage tank. i'm curious if there...
Doing a gut renovation on a 3-story residence and have come across a 3/4" plywood subfloor nailed to the 16" o.c joists, but the plywood is not staggered, nor was there any blocking for end seams. Curious what options are on the table to look at here that don't involve ripping out the subfloor...
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I want to reboot an old thread that was closed, but the issue doesn't appear to be resolved yet (or at least not to me). Ignore the "Lead" part of the old thread, it is not a human health issue. There is on-going debate about whether or not the zinc primer contributes to...
what would you expect the time of concentration be for a high-performance artificial turf football field? i figured less than 5 minutes.
turf over 10" washed drainage stone. stone over geotextile and compacter earth. slopes 1% from center of field to 4 corners. laterals at 15 feet o.c.
i'm...
Hello Folks,
I'm looking at a geotechnical study done in 1990 for a buried pipeline where they measure soil conductivity of samples and it appears they inversed it to get resistivity. We perform resistivity testing along with other corrosion-related soil testing for pipeline and mse wall...
Hello Folks,
I'm looking at a geotechnical study done in 1990 for a buried pipeline where they measure soil conductivity of samples and it appears they inversed it to get resistivity. We perform resistivity testing along with other corrosion-related soil testing for pipeline and mse wall...
Hello everybody,
I've got a little interoffice debate that i want to get some outside views on.
Appendix G in API-653 is the "Qualification of Tank Bottom Examination Procedures and Personnel"
There is a lot to App G but what is the focal point is G.4.4 which states,
"G.4.4 The authorized...
