Concrete block mats were removed, and then the sink hole was over excavated and compacted. Geotextile liner was installed and coarse aggregate was used on the bottom and compacted. We installed more liner to cover the aggregate and used DOT grade fill which was compacted in 6-inch lifts, Once optimal grade was meet, concrete block mats were then reset and sod was laid around all edges of the work area. Follow us on Instagram and see more projects showcasing our Best Management Practices.
We are digging with a vac truck, it’s called soft digging. The client was experiencing flooding in the truck bay and we ran a camera up the outflow line of truck bay and found a Pepsi can and other debris restricting the water flow. We tried to jet with a linear hose and flush the line but couldn’t move or break up the blockage. We had a beacon on the camera and were able to pin point where the blockage was precisely for easy excavation of pipe. We used the soft dig method because of underground utilities which were present in the parking lot, (811dig will give major utilities). Construction footprint is a lot smaller with soft digging than with traditional earth moving equipment.
Vac truck is like a giant vacuum cleaner on wheels, it also has a water pump on it allowing you to pressure wash and jet pipes. When you soft dig you use the water to break soil up and the vac truck will suck it up. It allows you to safely see any underground utilities.
Construction site best management practices (BMP) are installed to prevent erosion. These BMPs capture sediment on the construction site.
Hire DGC for your next construction project project
Proper design. Proper installation
There are many types of stormwater assets and even more methods for maintaining and repairing them. A Detention Pond is our main focus in this blog post and we will discuss how to remediate a detention pond that is not functioning properly. During and after a storm event, a detention pond collects stormwater that is conveyed to it from somewhere else (usually an impermeable surface close-by). Generally, the water that collects is supposed to drain - or percolate - back into the aquifer within a 72 hour time period. An easy way to remember the difference between a detention pond and a retention pond is after school detention ended and you were let go, whereas retention is a more long term scenario, holding water permanently.
There are a number of reasons why the stormwater in a detention pond might not percolate properly, including improper design and construction, incorrect fill media, and sedimentation - a build up of sediment transported by stormwater. Rectifying all of these issues is very important for the simple fact of safety and flood control. In addition, most regulatory agencies have compliance standards and consistently look for these non-compliant systems to issue Notice of Violations - NOVs. Ensuring your detention pond functions properly will save you money on maintenance and maintaining compliance.
Our case study is an excellent representation of a non-percolating detention pond that totals approximately 4,000 square feet and includes a concrete retention wall. The pond did not drain within the allotted 72hr period, at times became an eyesore due to algal blooms and unwanted vegetation was difficult to maintain for the contractor as they could not mow sod under water. On top of all that, this site was out of compliance and an NOV could have been right around the corner, literally - there is a regional field office for the local water management district less than two miles away from this location.
The processes involved in a project of this scope extend way beyond what one might think and various specialists are involved throughout the entire project. Geotechnical experts are occasionally consulted to provide geological surveys and soil analysis. Engineers and their assessments are consistently relied upon ranging from as-built drawings to any modifications that may need to occur. In the event of a modification to originally designed systems, additional permitting is ALWAYS required and opens the door for regulatory agencies and their involvement. Proper equipment and experienced operators are vital to the success of a project of this nature. Fences and gates are also a common piece of the puzzle that need to be handled accordingly. Unforeseen obstacles such as electric conduit or irrigation systems are always a concern; while ensuring proper trees and sod/seed are specified. Seed is usually preferred to sod due to the sedimentation that naturally collects in the sod at the sod farms.
Once the geotechnical items are handled, excavation can begin. The equipment operators will have been instructed on exactly how much earthwork needs to be done to satisfy the geo-parameters. A specific, predetermined depth is achieved and the foundation is scarified. Again, pre-determined choice of fill is brought in and distributed evenly across the area that has been excavated, careful not to impact the newly laid fill material. Trees are planted, grass seed is distributed and we wait for a rain event to see our handiwork in action!!
In conclusion, it is important to know what kind of stormwater assets you have and how best to maintain them. Detention ponds are meant to percolate back into the earth over a short period of time, and when that process is stagnated the pond needs to be repaired. There are many variables that can comprise the process and a proper plan of action is fundamental in a successful project. In the event that it needs remediating, having knowledgeable, experienced contractors is a very important aspect of the process. DGC Environmental is that knowledgeable, experienced contractor.
Let’s Work Together!
DGC Environmental is the solution to your stormwater problem.
Erosion is the displacement of soil by water, wind or other natural agents. The severity of the erosion is dependent on the environment, water velocity, soil type, and vegetative or other coverage.
Most municipalities require that any erosion that occurs on a property to be repaired as quickly as possible and failure to do so could result in a Notice of Violation (NOV) which can incur fines. Erosion repairs can be expensive, so the best way to manage erosion is to prevent it.
When looking for a solution to an erosion problem, rip rap can be a cost effective option. When properly installed it can slow water velocity and offer coverage to protect venerable areas from erosion. The proper installation makes all the difference in the effectiveness of the protection the rip rap will provide. Rip rap is commonly large rock that is installed over prepared ground and secured geotextile fabric. With this method, the ground beneath the rock is stabilized and can offer years of protection from elements of erosion. Typically, rip rap is used around structures, on slopes and in high velocity areas. In addition to offering a solution for erosion issues, rip rap is esthetically pleasing.
Maintenance costs are reduced when rip rap is used around structures because the areas will be sprayed quarterly instead of trimmed monthly or bimonthly. It also reduces the cost of sediment removal because the soil is not displaced, so sediment accumulation is reduced. In one of our projects, a client was having drainage issues and it was found to be accumulated sediment in a mitered end structure. We removed the accumulated sediment and added geotextile fabric and rip rap at the end of the structure. After the repair was complete, the drainage issues were resolved.
Even though some sediment accumulation will occur within any stormwater system, the amount can be minimized with preventative measures.
Rip rap was one of the first forms of erosion control, used on the dams in the Panama Canal in the early 1900’s, so it is a tried and true method.
Contact us today for a site evaluation and erosion prevention plan.
Contact Us Today!
For a Site Evaluation and Prevention Plan
When 215 MILLION gallons of radioactive treatment water drains through a sinkhole into Florida’s aquifer, every pond owner in the state takes notice. Sinkholes are becoming a common occurrence in Florida and with a recent environmental disaster involving a sinkhole under a treatment pond, the value (both environmentally and economically) of monitoring these systems has never been greater. DGC Environmental is now offering real-time, remote monitoring of environmental sites thanks to our new partnership with the real-time control experts at Opti.
What is so different about this approach?
Using state of the art equipment, innovative cloud-based technology, and real-time continuous monitoring, we can now reduce field expenses by limiting service visits to only when triggered by a maintenance condition, all while collecting continuous data and monitoring your system remotely. Pond water levels, flow monitoring and reporting, water quality monitoring and live camera inspection are now in real time and are available as services we provide. Opti’s current technology continuously monitors pond levels and calculates the expected drawdown rate of a facility; any deviation from this expected performance results in an instant alert to a technician who can login from any internet enabled device and get an in-depth look at the current status of the system. This real-time monitoring system could have prevented a large percentage of the discharged radioactive water from entering the aquifer through early identification of a rapid unexpected drawdown. Additional thresholds can be set to notify technicians of any abnormal water level drop, or rise (for flood mitigation), the instant it is picked up by professionally installed sensors. The future of stormwater maintenance is rapidly catching up with the rest of the constantly connected world.
Preventative maintenance of stormwater systems has never been so accessible and affordable. Have you considered reducing expenses and increasing visibility and control of your stormwater infrastructure? Contact us about how we can save you money and help you sleep at night.
The Zika Virus is a virus that is carried by mosquitoes. So far, there are 70 reported cases of Zika in Florida alone. According to the Centers For Disease Control and Prevention, the virus is mostly spread by the bite of an infected Aedes species mosquito. That particular type of mosquito bites aggressively during the day and at night. The virus can also be transmitted through sexual intercourse as well as blood transfusion. It is also passed from a pregnant woman to her fetus which can cause a birth defect called Microcephaly.
There is no immunization for this virus, so people must take precautions to protect themselves. Wearing long-sleeved shirts and long pants. The public has also been encouraged to us EPA approved insect repellents that contain Deet, Picaridin, IR3535, or oil of lemon eucalyptus. Even though these preventative measures are effective, one must also treat the areas where mosquitoes live and breed.
Since mosquitoes breed in standing water, any water source in or around your home or business should be monitored and/or treated. DGC Environmental is trained to treat Mosquito areas in order to interrupt the life cycle of the Mosquitoes. Shallow water with vegetation around the edge of a retention pond is the most attractive to mosquitoes so DGC will work to remove exotic vegetation in those areas and also treat with EPA approved pesticide. At least two treatments (2 weeks apart) are needed to rid your property of mosquitoes.
Some things you can do to remove standing water around your home and business.
Once a week, empty and scrub, turn over, cover, or throw out containers that hold water.
- Pet water bowl
- Flowerpot saucers
- Discarded tires
- Pool covers
- Trash cans
- Rain barrels
In our effort to remain industry leaders, DGC Environmental Services, Inc. will be attending WEFTEC 2016 from September 24-28, 2016. This marks the first year we will be attending and look forward to networking with other industry leaders and learning more about water quality and regulations.