09-14-2020 Council Packet - Laserfiche WebLink

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reviews and permits stormwater custom build subdivisions. This information wasn’t included in the incomplete letter as it is simply a further explanation for the review process of this permit. For stormwater, MCWD issues one overall permit for the entirety of the subdivision- we do not issue stormwater permits for individual lots. This comes from our language in Section 2 that outlines subdivision of land as requiring stormwater management as well as Section 2(a) of the rule that exempts the construction or re-construction of a single family home. Logistically, this means that one permit will be reviewed and issued (permit 20-190) for the subdivision’s stormwater management plan, wetland protection, and erosion control for any mass grading that may occur on site. As lots are sold and built, subsequent permits will be issued for the erosion control necessary for the construction of each home. This means that the District will review and hold the subdivision to a certain max amount of impervious that cannot be exceeded as each of the four lots are built out, as the stormwater BMPs will be sized to treat this amount and then reviewed and approved based on this amount. The District will cross-reference how much of the subdivision’s impervious is being ‘removed’ from the total amount reviewed and approved under 20-190, to ensure that the BMPs are still sized appropriately. However we will not review individual stormwater management plans for each lot. In the most recent stormwater management plan submitted on May 11th, rough calculations for each lot were provided as seen below-- I spoke with Josh about these amounts over the phone and if these are the impervious amounts that the subdivision would like to be held to, or if BMPs want to be built slightly larger to accommodate greater impervious areas. In addition, the submitted stormwater management plan will need to be expanded on to show the rate, volume, and phosphorous calculations for each of the BMPs that will treat impervious associated with the lots as the current submittal only shows calculations for the impervious associated with the cul-de-sac.