1527 FLORIDA DR 2022-04-15 - Laserfiche WebLink

SWPPP NARRATIVE • _ 6/13/2019 PAUL BUSTARD SHOR PLAT LOT 2 (PAGE 5 OF-6) For Lot 2, splash blocks will be used for roof runoff, and porous concrete will be used for the driveway. Once again,it is preferred that these LID BMPs area installed after building construction is completed to protect them as much as possible. There are many ways to protect LID BMPs that area already installed however. As previously mentioned, Wattles (BMP C235) will be used to prevent sediment from impacting installed porous surfaces, such as the access road and driveways. 2. PROJECT DESCRIPTION The project includes building construction of a residence (1,508 sf roof). A pervious concrete onsite driveway (501 sf), will be installed on the 7,121 sf lot. The total new plus replaced impervious surface area is 1,508 sf. Approximately 0.16 acre of disturbance proposed. The grading quantities for the proposed construction are estimated at: 80 CY Cut and 80 CY Fill, mostly within the structure footprint. 3. EXISTING SITE CONDITIONS The site consists of 0.65 acres in size and is currently cleared and being developed as a short plat. There will be a pervious access road and pervious driveways for all five lots on the site. The topography of the site shows that the ground slopes downward from west to east at 5-10% over most of the site. The high point of the site is in the west corner at approximate elevation 454, and the lowest point is the farthest east corner at approximately elevation 446. The proposed house construction is for Lot 1, which is the farthest lot to the south on the site. 4. ADJACENT AREAS The site is bounded by similar size single family lots to the southwest and northeast, Florida Drive to the southeast, and an interurban trail to the northwest. 5. CRITICAL AREAS There are no critical areas on site. There is a wetland to the south at the end of Florida Drive. The closest body of water is Wood Creek which per the City of Everett GIS Map flows through the wetland to the south and is contained in culverts and open channels until it reaches a full open stream approximately 0.5 miles to the west of the site. There are no critical areas or 303(d) listings for Wood Creek. 6. SOILS According to SCS the underlying soil is Alderwood-Urban land complex. This soil is moderately deep over a hard pan and is moderately well drained. Typically, the surface layer is very dark grayish brown gravelly sandy loam about 7 inches thick. The upper part of the subsoil is dark yellowish brown and dark brown very gravelly sandy loam about 23 inches thick. The lower part is olive brown very gravelly sandy loam about 5 inches thick. A weakly cemented hardpan is at a depth of about 35 inches. Depth to hardpan ranges from 20 to 40 inches. Permeability of the soil is moderately rapid above the hardpan and very slow through it. According to the DOE Manual, this soil is in hydrologic group C. 7. EROSION PROBLEM AREAS One area that shows potential for erosion is always present with pervious pavement. Since the pavement allows surface water to freely percolate through and infiltrate through the underlying media, this creates an erosion concern. It is critical that the underlying media is compacted properly and at a correct depth, or the water C:\Users\darianc\Desktop\CE\DOCS\Bustard SWPPP Lot 2.docx