How should I run a dual hydrologic soil group (A/D) in TR-55? It appears the soil group is defined A/D due to the shallow water depth, however, still has drainage characteristics of an A soil. Should I run it as all A soil or 50% A / 50% D?
Hi All -
I'm working on a project located adjacent to a CP Railway - anywhere from 20-50 ft from the tracks. It's a main trunk sewer main - 18" diameter. We originally designed the pipeline to be PVC, however, during the review process with CP Rail and in accordance with AREMA standards, they...
How's overtime typically work with the firms you work with?
I currently am a civil PE that works for an A/E firm and a majority of us are salary. We're overly busy with too much work right now. We are not paid for overtime, so I generally do not work overtime unless it's necessary (i.e...
I previously worked for a Design-Build company and have since moved on to a traditional engineering company. The design-build company had an in-house civil engineering division and an in-house excavation (construction) division. Since I've moved on, I've always wondered if this situation would...
I have a project with a maintenance garage floor drains discharging directly to the sanitary sewer. According to the Town sewer ordinance and plumbing code, an oil/water separator is required prior to discharging to the sewer. Did some research, called reps, etc. Found a wide variety of...
I'm looking for a good resource or design manual for the design of infiltration chambers. Particularly separation from groundwater and bedrock. I've contacted a couple manufacturers, however, each of their 'simple' designs do not take into account infiltration rates, groundwater levels...
I'm in the process of designing/researching the removal of TDS from a stormwater pond at a mining facility. The facility that I'm working on is pumping mine water to a stormwater pond. TSS settles in the forebay, however, TDS (currently a stained, greenish tint in the water) is present in the...
Our firm is in the process of designing a 1300ft rock breakwater. The breakwater is 12ft wide at the crest with 1.5H:1V slope to the riverbed. This breakwater will be situation within a river and the ACOE has suggested we install culverts within the breakwater to prevent stagnant water on the...
When creating proposals for projects, we've typically used $1500 per sheet as a cross check on our prices. Does anyone use anything different? We use standard 24x36 sheets. Thanks.
When a contractor applies for a change order, overhead and profit are applied to their extra. How about when they issue the Owner a credit? Shouldn't the Owner receive the overhead and profit associated with that item as well? Has anyone ever done this, seen it done, or seen it explained in...
We're putting together a set of plans for removing a dam in NY that was built in the 1920's. This is a small dam, approx. 100 ft long and 15 feet high. The stream is approx. 25 feet wide. This may be fairly conservative.
Do we have to do stream bed restoration? We're planning on removing...
I'm looking for information on designing a lagoon or settling basin for DE backwash from a water plant. We have limited space at the water plant, however there is a vacant lot that we can utilize to construct a lagoon or settling basin.
Currently, I plan on designing a holding tank at the...
I'd like to see some experiences and opinions on the following question. What is the maximum distance a septic tank should be placed away from a building while utilizing a 4" SDR-35 pipe with 1/4 inch per foot slope?
We haven't encountered any maximum distances before and New York State...
I'm been trying to develop a library of costs for engineer's estimates, however I'm constantly calculating numbers from scratch. It takes time to think about how many hours and call on material prices. Does anyone know of a resource for cost estimates? I'd like to go to a source and look up...
Our firm as been asked to complete a preliminary design for a diatomaceous earth settling tank. Currently, the client has several DE tanks for their water treatment process and they backwash them periodically into the waster water sewer. By doing this, they are coating the sewer lines with DE...
