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Minnesota Stormwater Manual

Minnesota Stormwater Manual test page 5
Revision as of 21:46, 27 June 2022 by Mtrojan (talk | contribs)

Warning: This page is an edit and testing page use by the wiki authors. It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.
Protection of existing trees on construction sitesStockpile managementConstruction materials managementConstruction materials managementSediment control practices - Perimeter controls for disturbed areasSediment control practices - Storm drain inlet protectionConstruction stormwater best management practice – Concrete, paint, stucco and other washout guidanceSediment control practices - Vehicle tracking BMPsProtection of existing trees on construction sitesSediment control practices - Storm drain inlet protectionConstruction stormwater best management practice – Concrete, paint, stucco and other washout guidanceConstruction materials managementSediment control practices - Vehicle tracking BMPsConstruction stormwater best management practice – Stormwater Pollution Prevention PlanSediment control practices - Perimeter controls for disturbed areasConstruction materials managementStockpile ManagementProtection of existing trees on construction sitesConstruction stormwater best management practice – Stormwater Pollution Prevention PlanConstruction stormwater best management practice – Site stabilizationConstruction stormwater best management practice – Site stabilizationProtection of existing trees on construction sitesThe SWPPP must describe methods to minimize soil compaction and preserve topsoil. Minimizing soil compaction is not required where the function of a specific area dictates compaction.Permittees must stabilize all exposed soil areas, including stockpiles. Stabilization must be initiated immediately to limit soil erosion when construction activity has ceased on any portion of the site and will not resume for a period exceeding 14 calendar days. Stabilization must be completed no later than 14 calendar days after the construction activity has ceased. Stabilization is not required on certain temporary stockpiles but must provide sediment controls at the base of the stockpile.Permittees must place building products and landscape materials under cover (e.g., plastic sheeting or temporary roofs) or protect them by similarly effective means designed to minimize contact with stormwater. Permittees are not required to cover or protect products which are either not a source of contamination to stormwater or are designed to be exposed to stormwater.Permittees must properly store, collect and dispose solid waste in compliance with Minn. R. ch. 7035.Permittees must establish sediment control BMPs on all downgradient perimeters of the site and downgradient areas of the site that drain to any surface water, including curb and gutter systems. Permittees must locate sediment control practices upgradient of any buffer zones. Permittees must install sediment control practices before any upgradient land-disturbing activities begin and must keep the sediment control practices in place until they establish permanent cover.Permittees must protect all storm drain inlets using appropriate BMPs during construction until they establish permanent cover on all areas with potential for discharging to the inlet.Permittees must provide effective containment for all liquid and solid wastes generated by washout operations related to the construction activity. Permittees must prevent liquid and solid washout wastes from contacting the ground and must design the containment so it does not result in runoff from the washout operations or areas. ermittees must properly dispose liquid and solid wastes in compliance with MPCA rules. Permittees must install a sign indicating the location of the washout facility.Permittees must install a vehicle tracking BMP to minimize the track out of sediment from the construction site or onto paved roads within the site.Permittees must keep the SWPPP, including all changes to it, and inspections and maintenance records at the site during normal working hours by permittees who have operational control of that portion of the site.Permittees must stabilize all exposed soil areas, including stockpiles. Stabilization must be initiated immediately to limit soil erosion when construction activity has permanently or temporarily ceased on any portion of the site and will not resume for a period exceeding 14 calendar days. Stabilization must be completed no later than 14 calendar days after the construction activity has ceased. Stabilization is not required on constructed base components of roads, parking lots and similar surfaces.Permittees must immediately initiate stabilization of exposed soil areas, as described in item 8.4, and complete the stabilization within seven (7) calendar days after the construction activity in that portion of the site temporarily or permanently ceases.Image map test
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Information

Reporting phosphorus and TSS reduction credits from street sweeping

graph of P removal with street sweeping
Research conducted by Bill Selbig (USGS) shows that streets, when cleaned of leaf litter prior to a storm, can significantly decrease phosphorus loads in stormwater runoff (Link to study)

At this time, the MPCA has not developed guidance for how to credit reductions in phosphorus or total suspended solid loading associated with enhanced street sweeping. We anticipate developing this guidance in 2022. In developing this guidance, consider the following.

  • Baseline: Credits toward permit compliance, such as compliance with total maximum daily loads, can only be applied toward enhanced street sweeping. This is sweeping that results in pollutant reductions above pollutant reductions associated with sweeping that occurred at the baseline year.
  • Accounting for seasonality: The image on the right illustrates the seasonal nature of phosphorus loading in areas where leaves and other organic sources are a source of phosphorus. Most models and other methods of estimating annual loads do not consider this seasonality and most likely significantly underestimates annual phosphorus loading. Accurate representation of impacts from enhanced street sweeping will require adjusting initial (baseline) calculations of loading. The MPCA is discussing appropriate methods for accounting for this seasonality.
  • Downstream BMPs: Enhanced street sweeping potentially impacts loading to and performance of downstream BMPs. The MPCA is discussing if adjustments in downstream loading and/or adjustments in BMP performance are needed to accurately determine changes in phosphorus loading in areas where enhanced street sweeping is implemented.
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