"During the development of this final permit, EPA conducted futher research into the relative toxicity of chemicals commonly used for treatment construction stormwater discharges. This research was intended to supplement the aquatic toxicity data collected as part of the C&D rule promulgation, and to address comments received on the proposed CGP relating to toxicity. The research focused on different formulations of chitosan, a cationic compound, and both cationic and anionic polyacrylamide (PAM). In summary, the studies found significantly less toxicity associated with using anionic PAM."
--2012 US EPA Construction General Permit Fact Sheet, page 23
Click here to view the EPA Construction General Permit Final Fact Sheet
APS Silt Stop® anionic polymers are used to prevent erosion on slopes and control sediment runoff. Soil specific polymer additions (in granular or liquid form) can assist temporary or permanent grassing by binding the seed, fertilizer, mulch, and soil together until the grass germinates.
APS Floc Logs® can be used to clarify stormwater removing turbidity such as sediment, heavy metals, and inanimate nutrients reducing the total suspended solids.
APS Silt Stop® Powders can be used for mud thickening to remove unmanageable muck. Highly saturated soils can be messy and difficult to remove without spilling or dripping.
APS Silt Stop® material is designed to agglomerate very fine particulate and retain that agglomerate for 1-4 days, while still allowing water to penetrate the soil. This has been shown to reduce airborne dust from haul roads, waste dumps, tailing piles, and open areas on construction sites.
APS 700 Series Silt Stop Anionic Polyacrylamide Erosion Control Powder. APS 700 Series Silt Stop is a group of soil specific polyacrylamide co-polymer powders used for erosion control. They reduce and prevent erosion of fine particles and prevent colloidal clays from entering water bodies.
APS 700 Series Floc Logs are a group of semi-hydrated anionic polyacrylamide blended logs that when placed in the flow of turbid water remove fine particles and reduce turbidity, metals and inanimate nutrient values. Each Floc Log is formulated for the soil and water chemistry of the specific site where the placement and usage are intended.
APS 600 Series Silt Stop Anionic Polyacrylamide Erosion Control Emulsions. APS 600 Series Silt Stop is a group of soil specific anionic polyacrylamide co-polymer emulsions used for erosion control. They reduce and prevent erosion of fine particles and prevent colloidal clays from entering water bodies.
Applied Polymer Systems (APS) uses an innovative approach for the performance optimization of polymer applications. Unlike conventional techniques that tend to only "get close", APS precisely matches the correct polymer to the desired application.