Friday, January 21, 2011

Warren County, NY SWCD installs TerreKleen hydrodynamic separator to improve stormwater runoff at AAA rated, historically important, Halfway Brook, Queensbury, NY

We LOVE what we do because we:
1) Really help our clients improve stormwater runoff
2) What we do has a long term impact on improving water quality
It means a lot to have this opportunity.

During the summer of 2009, we were invited to make a site visit and compete against other hydrodynamic separator units for a high profile project to improve the stormwater runoff that flows into Halfway Brook in Queensbury, NY.   Queensbury is located in Warren County, which is located on the edge of a 6 MILLION ACRE Adirondack State Park.

This particular site was selected because:
1- The Warren County SWCD wanted to have the largest impact on improving stormwater and this outfall is the largest in the County
2- A large surrounding commercial area of 106 of impervious surface drains into Halfway Brook at this point.
3- Halfway Brook is a historically important Brook
4- Halfway Brook is a AAA rated Trout Brook
5- Brook trout need cold clean water to thrive
6- Site is upstream from a popular public park

The site constraints were very difficult:
1- The site had a very small footprint 
2- A 12" gas main ran through the property
3- Other utilities ran through the property
4- Unit would have to go RIGHT NEXT to the brook, so there is a high water table
5- Runoff from a large commercial area (106 acres of impervious surface) enters the brook at this location
6- Site is right along side a major state route - with lots of traffic
7- The property owner agreed to help at great inconvenience to himself and his going business
8- The site had previously been a gas station - leaky tanks contaminated the site and it had undergone cleanup

The best option at this site would be a hydrodynamic separator.  Water could flow down to toward the brook and through the hydrodynamic separator.  We demonstrated how the TerreKleen works:

1- Water enters the primary chamber where oils, sediment, trash are collected
2- The water then flows through a screen into the secondary chamber and onto the TerreKleen's stacked inclined plates
3- The water enters the secondary chamber near the bottom of the plates as the water rises the stacked inclined plates help finer sediments fall out
4- Once collected, there is no scour or re-suspension and so the material is permanently collected
5- Maintenance is easy - NO CONFINED SPACE ENTRY is required and most maintenance is completed with a vac truck in about an hour
6- What is really cool is to realize that the stacked inclined plate technology is technology that has been used to separate particles from drinking water since 1905.  One would think that if there were a better way to separate particles from water, the drinking water industry would have gone with it.  This technology is still widely used and its effectiveness is well known by engineers.  The TerreKleen simply adapts this technology to efficiently remove sediments from stormwater.

Details on the TerreKleen:
Each TerreKleen is custom manufactured for each site.  We look at flow rates, particle size removal objectives and where the pipes are coming in and manufacture the TK for specific site)  
This site has a TK63 - which is our largest unit
TK63 Structure size is: 16.5' X 7' (115.5 ft2)
TK63 offers 403 ft2 Settling Surface Area
The Settling Surface Area per Structure Ft 2 for the TK63 is 349%
*(Please read ft2 as "foot squared - I cannot figure out how to superscript the 2 - thank you)

Here are a few pics:
Just cool to see part of the unit on the ride
up to the site.  The weather is sub-optimal

You can see the site here - RIGHT NEXT TO
THE BROOK.  The guys told me that brook
 trout are always seen right here at the outfall.

The hole has been pre-dug and prepared
for the TerreKleen.  The crane is in place and
ready to go.  Trucker backs in to
start off-loading the base of the TerreKleen.

Here is the base - in place
This shows the manifold system
which allows the TerreKleen to
be cleaned from the curb.

Here is the middle section of the
TerreKleen getting installed.
This is our largest unit and
these plates will help all of the
fine sediments settle out. 

Two hours later and
3 lifts by the crane,
the TerreKleen is in place and ready to work

The TerreKleen is the BEST option at this site.
Not only does TerreKleen maximize the 
sedimentation in the smallest footprint, but 
the easy maintenance/cleanout will significantly
help keep both short and long-term
maintenance costs to a minimum.

What a great day!

PS - here is a link to project details prepared by
Warren County Soil and Water Conservation 

Monday, January 17, 2011

Stormwater Cleanout - Confined Space Entry NOT REQUIRED

When we talk about stormwater with our clients, one of the most important things we discuss about is The "M" Word... MAINTENANCE.  Since we know how time and money intensive maintenance of stormwater systems can be, we try to recommend the most effective stormwater solution with the least maintenance required.

In early January we had installed our second TerreKleen hydodynamic separator in Waccabuc in Westchester County, NY.  The first unit had been installed in September.  Since we have had lots of snow here in the Northeast this Winter, the first unit was buried in a snow bank, but we were able to "pop the lids" and see how the system was working:

Even though there is snow all over up-top, you can see
once we "popped the lids" that the water is still flowing
through the unit.  See trash and debris that has been
collected in the primary chamber.

This is a picture of the secondary chamber.  You can see
the plates where finer sediment settles out.  See the red hose?
The red hose clips to the top of the unit.  The vac truck
operator can energize our manifold system at the bottom
of the unit to re-suspend the sludge blanket.

Wednesday, January 12, 2011

TerreKleen 02 installed to capture sediment and improve stormwater runoff

A GREAT KICK-OFF FOR 2011!  Even though it was a bit cold, it was a great day to be outside and see our first Terre Kleen hydrodynamic separator of 2011 installed!

We are on-site at 7:00 AM and the trucker has already arrived.  TerreKleen arrives pre-assembled and ready to install.  This makes installation easy.  

TerreKleen is quickly off the truck and installing in the hole the contractor has prepared.
The conseal (black strip) is quickly applied.  We are now ready to install the riser section.
Riser is being installed

TerreKleen installed!!!

The primary contaminant at this site is sediment.  The TK02 is a smaller TerreKleen unit.  The size of the TerreKleen for each site is chosen based on flow rates and the sediment particle size that client needs to capture.  After pipes are connected and manhole covers put in place, TerreKleen will be fully functioning and will immediately start to work.

Saturday, January 8, 2011

Engineering Expo for HS Kids - Sunday, April 3, 2011 - White Plains HS

We are excited to be volunteering to help pull together the 8th annual engineering expo designed to show middle and high school kids what engineering is.  Kids will have the opportunity to speak with engineers, find out about the diverse career paths available through engineering and how they can "get there".  The expo is scheduled for Sunday, April 3rd at White Plains High School.

Many local engineering firms, businesses, government agencies will be represented at the expo.  Additionally, a number of colleges and universities will be on hand to discuss their engineering programs as well as college finances.  (Last year we had about 1500 students attend and 35 college programs were represented)

Attendance is free.

The special guest at the expo will be Marshall Brain, Founder of "How Stuff Works" a program on The Discovery Channel.

If you are a company and can help sponsor the event, if you are a college/university and you can exhibit at our event or you are a middle or high school student that wants to learn more about engineering careers, please come to our great website and register!

Hope to see you there!  Should really be a great day!