CME Associates Review 2

\ ASSOCIATES Chairman and Members of the West Orange Township Planning Board duly 29, 2024 Re: West Essex Highlands, LLC (PB 24-01) Our File No. VWRP0179.01 Preliminary & Final Site Plan - Review #2 Page 11 32. 33. 34. 35. 36. 37. 38. 39. 40. At. 42. 43. 44, The hydrograph routings for porous pavement system #6 utilize an exfiltration rate of 10 inches per hour. The Stormwater Management Report indicates that a design permeability rate of 4 inches per hour is utilized and the porous pavement #6 section on Sheet SP-25 indicates the soil replacement permeability will be 20 inches per hour. This discrepancy must be resolved. Sheet SP-25 must be revised to correct the finished grade elevation on porous pavement section #6 detail. Verify drainage areas ‘Basin 7 — Imp’ and ‘Basin 7 — Perv’ as same is inconsistent with the Post-Development Drainage Area Map. The Stormwater Management Report indicates that exfiltration will be utilized for small scale infiltration basin #7, however, the hydrograph routings do not include exfiltration. Clarify. Sheet SP-22 must be revised to indicate the size and elevation of the orifice and or weir associated with outlet structure #7. Additionally, the label for outlet structure #7 includes an invert into the structure at elevation 531.6, however, there does not appear to be a connection into outlet structure #7. This discrepancy must be resolved. Sheet SP-22 indicates that the top of grate for outlet structure #7 is at elevation 533.00, however, the outlet structure #7 detail on Sheet SP-22 indicates a grate elevation of 533.02. This discrepancy must be resolved. Sheet SP-22 must be revised to indicate the size and elevation of the orifice(s) and or weir(s) associated with outlet structure #8. Verify the size of the pipe that exits outlet structure #8 as it is inconsistent between the plan and detail. Sheet SP-22 and the detail on Sheet SP-26 shall be revised accordingly. Verify the size of the pipe that connects to outlet structure #9 as it is inconsistent between the plan and detail. Sheet SP-23 and the detail on sheet SP-26 must be revised accordingly. Sheet SP-23 indicates that outlet structure #9 has a 4”x40” weir at elevation 564.9 while the hydrograph routings and Sheet SP-25 indicate that the weir is a 4’ weir at elevation 564.0. This discrepancy must be resolved. Sheet SP-23 shall be revised to

4”x40” weir at elevation 564.9 while the hydrograph routings and Sheet SP-25 indicate that the weir is a 4’ weir at elevation 564.0. This discrepancy must be resolved. Sheet SP-23 shall be revised to indicate that outlet structure #9 will have a rim and not a grate. Sheet SP-23 indicates that the rim of outlet structure #9 is at elevation 568.2 while the outlet structure #9 detail on sheet SP-26 indicates a rim elevation of 568.0. This discrepancy must be resolved. Sheet SP-23 shall be revised to re-locate outlet structure #10 or stone rip rap #B10-1 as the outlet structure appears to be located on top of the proposed rip-rap apron. :\West Orange\Pianning BoardiVWRPO179.01 - West Essex Highlands, Inc\Review #2 07-29-24 docx