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Turbidity Control by Chemical Flocculation: Basic Concepts

While the US EPA has withdrawn its proposed turbidity limit on construction site runoff, there are still many states have or are proposing their own enforcement levels. Construction site owners and managers are also looking for ways to avoid public outcry and potential lawsuits over muddy water leaving their site. In most cases, typical and even more advanced erosion and sediment control practices will not prevent discharges that look like chocolate milk. This two-part seminar will explore the principles behind chemical treatments to rapidly settle suspended solids and reduce turbidity in runoff from construction sites. In the first part, McLaughlin will discuss ways to make typical practices work much better and then explore the turbidity problem and how chemical treatment can solve it.
Member Price:
$50.00
Nonmember Price:
$65.00
Available for Immediate Download
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Vegetation Basics

Module two discusses beach and dune restoration and nourishment as an important component of proper coastal system management. Construction and maintenance of the components that make up the coastal system, such as dune restoration (including dune vegetation and sand fencing) and beach nourishment, are discussed in detail, including construction techniques and costs. The variety of techniques and equipment used to construct projects is discussed at length, including locating and analyzing compatible sediment material, which includes grain size, composition, and color, both from offshore and upland areas. Finding and transporting the best sediment material for the appropriate beach and dune system is a major focal point.
Member Price:
$50.00
Nonmember Price:
$65.00
Available for Immediate Download
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What’s a Contractor to do When the Sediment Pond Does Not Work?

A good design, proper construction and frequent maintenance still offers no guarantee that a sediment pond will discharge turbidity-free discharge. So what can a contractor do to improve the effectiveness of sediment ponds, after it has been constructed according to design standards; but still will not accomplish its objective? Briefly I will discuss the complexity of runoff generated by Mother Nature. Then I will examine the benefits of five initiatives: upstream treatment, inflow diversion, pond slope stability, filtering berms and discharge techniques. While any one of these components will result in some improvement of discharge quality, the incorporation of all five components will significantly increase sediment trapping. Examples of each component will be illustrated. Coupling these components will be the key to success!
Member Price:
$50.00
Nonmember Price:
$65.00
Available for Immediate Download
↑/↓ Full Details