introduCtion Why is There a Need? When it rains, oils, sediment and other contaminants are washed from paved surfaces directly into our storm drains and waterways. Non-point source pollution such as stormwater now accounts for 80% of water pollution in North America and governments are responding with demanding regulations to protect our water resources. ConCrete pipe stormwater treatment teChnologies Total Loadings Management According to Alberta Environment (AENV), oil/grit separators are considered a best management practice (BMP) for developments under five hectares. Typical applications include parking lots, commercial & industrial sites, gas stations, airports, and residential developments (pretreatment of ponds/wetlands or as part of a treatment train). The need for an oil/grit separator is directly related to and driven by total loadings management, which refers to the sediment accumulation within a river basin as the result of urbanization. box seCtions Under the terms of an Approval to Operate, a municipality is required to submit to AENV a Total Loadings Plan (TLP). Within a TLP, the municipality is tasked with assessing their watershed for key water quality indicators, with total suspended solids (TSS) at the forefront, but also including other parameters such as Total Phosphorous, Total Nitrogen, and heavy metals. A TLP establishes baseline criteria for the parameters outlined above, as well as a framework for limiting future annual loadings. As urbanization and high density development continues, total loadings becomes more challenging to manage, and in time regulatory requirements pertaining to stormwater treatment will become more stringent. manhole and CatCh basin material LAFARGE PIPE eMANUAL PAGE 5