03/08/2023 P & Z Combined Packet

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Ms. Katie Larsen 03/01/2023 Page 3 399 Elm St (Centennial Middle School) Engineering Review at that angle to the existing pipe. Based on pipe sizes and the acute angle, the minimum structure diameter is 48”. 3. (3/1/2023) Applicant to add contours to utility sheets. 4. (3/1/2023) Applicant to revise Pond 1 outlet pipe modeling in HydroCAD to match proposed inverts in plans. Modeling the existing pipe to the catchbasin in the bituminous trail is also recommended. 5. (3/1/2023) Applicant to revise HydroCAD modeling to not include exfiltration in Pond 1. 6. (3/1/2023) Applicant to specify casting on STMH-1 structure. 7. (3/1/2023) Applicant to include silt fence around the infiltration basin surface until final stabilization has been achieved to prevent sediment clogging of basin. 8. (3/1/2023) Applicant to include silt fence around FES-2 until final stabilization has been achieved to prevent sediment loading into the storm sewer network. • Water Supply There is an existing 8-inch diameter ductile iron pipe (DIP) watermain along 4th Avenue that serves the school. No changes to the water system are proposed at this time. WSB staff does not have any comments at this time. • Sanitary Sewer There is an existing 10-inch diameter polyvinyl chloride (PVC) sanitary sewer along 4th Avenue that serves the school. No changes to the sanitary sewer system are proposed at this time. WSB staff does not have any comments at this time. • Transportation The proposed improvements are completely within the 399 Elm Street (Centennial Middle School) site and do not affect any public roadways or intersections. A traffic study is not required. The proposed improvements are not anticipated to affect traffic volumes at the site. The proposed parking lot has two access points off of another parking area on the school site. The entrances to the proposed parking lot and the drive lanes are all proposed to be 24-ft wide. All parking stalls are shown at 9 ft x 18 ft. The curb and gutter is proposed as a B612 design along the north and west sides of the lot and a surmountable design along the west and south sides of the lot. The parking lot has five handicap accessible stalls proposed near the west entrance. A bituminous trail is proposed to be reconstructed and realigned with the parking lot improvements. The existing parking lot has a total of 129 parking stalls and the proposed lot has 134 parking stalls. New curb and gutter is proposed along the western edge of the proposed tennis court area. Concrete sidewalk is proposed between the two court areas (four courts to the north and four courts to the south). A bituminous trail is proposed to be reconstructed and realigned with the tennis court improvements.