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Ms. Katie Larsen <br />03/22/2023 <br />Page 3 <br />399 Elm St (Centennial Middle School) Engineering Review <br />Existing 9.49 15.82 32.09 Not provided <br />Proposed 8.39 14.57 30.29 Not provided <br />Comments: <br />1.(3/1/2023) Staff recommends adding cleanouts to the tennis court drain tile <br />system. <br />(3/17/2023) Due to the fact that only clean ground water will be entering the <br />drain tile system. We do not see the need to include cleanouts. <br />2. (3/1/2023) For the pipe connection from FES-2 to the existing CB, applicant <br />to verify if they can feasibly core drill another 12” RC pipe into the structure <br />at that angle to the existing pipe. Based on pipe sizes and the acute angle, <br />the minimum structure diameter is 48”. <br />(3/17/2023) A second structure has been added to ensure feasible angles <br />entering the existing structure. <br />3.(3/1/2023) Applicant to add contours to utility sheets. <br />(3/17/2023) Contours have been added to Sheet C401. <br />4.(3/1/2023) Applicant to revise Pond 1 outlet pipe modeling in HydroCAD to <br />match proposed inverts in plans. Modeling the existing pipe to the <br />catchbasin in the bituminous trail is also recommended. <br />(3/17/2023) HydroCAD and plans are now matching. This catch basin has <br />been added to the modeled. <br />5.(3/1/2023) Applicant to revise HydroCAD modeling to not include exfiltration <br />in Pond 1. <br />(3/17/2023) Exfiltration has been removed. <br />6.(3/1/2023) Applicant to specify casting on STMH-1 structure. <br />(3/17/2023) Casting is specified on the detail. See details, 5/C501 and <br />6/C501. <br />7.(3/1/2023) Applicant to include silt fence around the infiltration basin surface <br />until final stabilization has been achieved to prevent sediment clogging of <br />basin. <br />(3/17/2023) Sediment log has been added to the bottom of the basin. <br />8.(3/1/2023) Applicant to include silt fence around FES-2 until final <br />stabilization has been achieved to prevent sediment loading into the storm <br />sewer network. <br />(3/17/2023) Sediment log has been added surrounding FES-2. <br />•Water Supply <br />There is an existing 8-inch diameter ductile iron pipe (DIP) watermain along 4th Avenue that <br />serves the school. No changes to the water system are proposed at this time. <br />WSB staff does not have any comments at this time. <br />•Sanitary Sewer <br />There is an existing 10-inch diameter polyvinyl chloride (PVC) sanitary sewer along 4th <br />Avenue that serves the school. No changes to the sanitary sewer system are proposed at <br />this time.