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William Heffernan, P.E., M.ASCE


Contributions

1 to 3 of 3 total

RE: RCCP and DIP

Posted By William Heffernan 05-08-2018 10:00 AM
Found In Egroup: Environment, Coasts, Oceans, & Infrastructure \ view thread
​Michael If you are looking to repair Reinforced Concrete Pressure Pipe, I would refer you to the New Jersey Water Supply Authority and The Washington Suburban Sanitary Commission in Maryland both Agencies had major problems with their use of Reinforced Concrete Pressure Pipe. NJWSA repaired their ...

RE: Institutional memory on stormwater treatment?

Posted By William Heffernan 05-04-2018 10:51 AM
Found In Egroup: Environment, Coasts, Oceans, & Infrastructure \ view thread
​Elizabeth My reply was to provide a possible starting point for where the 80% originated. I believe the Erosion Control Standards pre-date the implementation of RCRA and CZARA laws. These ACTS maybe the point where the 80% became accepted. I do agree it is time to review and revise the requirement ...

RE: Institutional memory on stormwater treatment?

Posted By William Heffernan 05-02-2018 10:17 AM
Found In Egroup: Environment, Coasts, Oceans, & Infrastructure \ view thread
​Elizabeth, I believe the 80% comes from the development of the detention basin standards for erosion control. Detention of flowing muddy water is an effective method to cause the water to drop its sediment load. However, time becomes a factor to drop the smallest soil particles (clay). I was taught ...