Agenda - Council - 09/14/2021 - Laserfiche WebLink

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Trott Brook Crossing EAW August 2021 Permit No. Well No. Annual Permitted Volume (MGY) Annual Average Use 2013-2018 (MGY) Annual Maximum Use 2013-2018 (MGY) 1985-6005 743832 850 89.1 161.6 1985-6005 743833 850 51.5 129.9 During 2013-2018, these wells used a combined average of 646.9 MGY, indicating an average available unused permitted volume of 203.1 MGY. Based on past use and permitted capacity, the existing municipal wells have sufficient surplus capacity to serve the proposed project. A twelve (12) inch watermain exists under the east side of Variolite Street between 163rd Avenue NW and 173' Avenue NW. Watermain extended through the Trott Brook is anticipated to be 8-inch diameter (to be determined). Water flow, pressure, and storage will be adequate to serve the development area. As indicated under Item 11.a.ii, the project is not located in or near a wellhead protection area. iv. Surface Waters a) Wetlands. Describe any anticipated physical effects or alterations to wetland features such as draining, filling, permanent inundation, dredging and vegetative removal. Discuss direct and indirect environmental effects from physical modification of wetlands, including the anticipated effects that any proposed wetland alterations may have to the host watershed. Identify measures to avoid (e.g., available alternatives that were considered), minimize, or mitigate environmental effects to wetlands. Discuss whether any required compensatory wetland mitigation for unavoidable wetland impacts will occur in the same minor or major watershed, and identify those probable locations. The project is estimated to include less than 2.0 acres of wetland impacts. Wetlands proposed for impact will primarily consist of isolated depressions within the farmed portion of the site, and a road crossing on the eastern portion of the site. Wetland impacts may also be required to facilitate construction of a pedestrian bridge over Trott Brook as discussed in Item 11.iv.b. The project proponent will be required to demonstrate wetland impact avoidance and minimization measures by preparing a wetland permit application and responding to agency comments during wetland the permitting process. The project proponent will be required to replace wetland impacts at appropriate ratios through the purchase of approved wetland credits from available wetland banks. Wetland replacement is most likely to occur offsite at available wetland banks because wetland banking allows for use of wetland credits that are created and functioning prior to wetland impacts. Under the WCA and CWA, it is anticipated that required wetland credits will come from banks located in the same Wetland Bank Service Area, and potentially within the same Major Watershed as the wetland impacts. Ultimately, the wetland credits that may be purchased for compensatory mitigation will depend upon the credit balances available for sale at the time when wetland replacement occurs. The project proponent will be required to implement BMPs or other management practices that help reduce and eliminate wetland impacts over time. Project proponents and construction contractors will choose stormwater practices appropriate for the site and install practices according to permit guidelines. Stormwater treatment basins will be designed to treat runoff from impervious surfaces and help maintain the hydrology of avoided wetlands either through discharge of treated surface 19