We provide construction services to many of our clients.
These services range from bidding & construction observation to as-builts & record drawings.
For larger sites we provide Stormwater Pollution Prevention Plans and soil erosion inspections, referred to as SWPPP’s.
Under the Clean Water Act, operators of construction activities that meet the requirements of the National Pollutant Discharge Elimination System (NPDES) general permit are authorized to discharge pollutants in accordance with the effluent limitations and conditions. Permit coverage is required from the “commencement of earth-disturbing activities” greater than 1.0 acre. States may have individual permitting requirements that are more stringent than the NPDES or local permits required prior to construction.
We perform SWPPP inspections once a week from the initial construction to a point where the site is considered nearly complete and the landscaping is stabilized.
During heavy rain events greater than 0.5”, additional visits are required. During the inspections, we look to confirm the Stormwater Pollution Prevention plan is being implemented. If issues are found, we notify the General Contractor and note it in the inspection reports.
Below are a few examples from our projects illustrating some of the typical SWPPP devices.
The Construction Entrance is the main access to the site for contractors, material haul off, and building supplies. Sediment from vehicles is tracked into the public roadways where it ends up in the storm sewer system connected to lakes and streams. In this picture, mud & puddles can be seen on the site.
A proper construction entrance consisting of large open graded rock works well to remove mud from tires and reduce tracking. Wash stations are used in situations when the rock entrance is overwhelmed by sediment.
A silt fence is a part of nearly every construction site, no matter the size. A properly installed & maintained silt fence prevents sediment from leaving the site, damaging property, and polluting bodies of water. In this picture from one of our projects, this improperly installed silt fence will not work. The fence needs to be keyed into the soil subgrade to allow the filter fabric to work.
Silt fences are often damaged during construction because they can obstruct the construction process. During our inspections, we check for silt fences in need of repair and report it to the GC.
Inlet baskets and filters are another very common method of trapping sediment during construction. They can be as simple as filter fabric placed between the rim and the frame of the storm structure or manufactured baskets with sturdy metal framing. This photo depicts the sediment entering the street from over the curb and flowing in the gutter to the inlet. The fabric is inspected weekly and needs to be cleaned as the basket fills with sediment.
Keeping stormwater clean is good for the community. We want to do our part to ensure that construction doesn't get in the way of your water being clear and clean.