The surface basins show stormwater overflow using "bubbler inlets". Overflow from the bubbler on Lot 30.11 will flow across the proposed vacated portion of Sams Road and into the wetland buffer. However, overflow from Lot 30.10 will flow from Lot 30.10 onto adjacent residential Lot 30.09. The applicant should address this issue by providing an alternative overflow design, such as additional detention volume for the overflow or; redirecting the overflow through an easement to a more beneficial location.

  1. The Stormwater Management Report indicates "An outlet control structure is proposed in each surface basin which will direct runoff in excess of the water quality storm via a 15" (Surface #1) and 6" (Surface #2) outlet pipe to convey excess runoff beyond required reductions to a swale near the property limit". However, both outlet control structures are shown having 15" outlet pipes that lead to the bubbler inlets, not to a swale. The applicant should address this.
  2. Proposed spot grades should be added to the Proposed Drainage Area Map Plan and increase the line size of the drainage area boundaries for clarity.
  3. The Stormwater Management Report states "Runoff from remaining woodland area of the property is not captured in the proposed stormwater facilities". The proposed grading for all lots (except the area occupied by the wetlands and wetland buffer) is shown extending to the property lines, therefore, replacing the existing woodlands with lawn area. The applicant should address how the direct runoff (non-containment) from these new lawn areas meets NJDEP requirements for Water Quality Treatment post vs pre-development storm event reduction, etc.
  4. Outlet Control Structure 1 is labeled as "OCS-2" on the Grading and Drainage plan.
  5. The Top of Grate Elevations for Outlet Control Structures 1 and 2 should be coordinated between the grading and Drainage Plan and Construction Details (Sheet C 601).
  6. Access drives to both surface infiltration basins should be shown on the plan. Additionally, a "Basin Gravel Access Drive Section" detail should be provided.
  7. Stormwater basin lots should be labeled as "To be owned and maintained by Homeowner's Association".
  8. Access easements to the basins should be shown and dedicated to the Township of Jackson.
  9. Two (2) soil boring logs are provided in the Stormwater Management Report. An Estimated Seasonal High Water Table (ESHWT) is reported as being located 87" and 85" below grade respectively (resulting in Elevations of 90.3 and 89.7). Additional soil borings/test pits are required in the locations of the basins in accordance with NJDEP protocol along with associated testing results. Verification of a minimum separation distance of 2' between the ESHWT and the bottom of the basins will be made after the results are submitted by the Applicant.
  10. Groundwater Mounding Hantush Spreadsheet results are contained in the Stormwater Management Report. The applicant should justify why a Kh value (Surcharge Rate in the Coastal Plan) of 5X the Recharge Rate (R) was not used for the calculation. Additionally, the locations of the analysis should be indicated on each spreadsheet.
  11. Clarify distance between pipes on "Underground Basin Section View" on Sheet C601.
  12. Coordinate the values shown on Sheet C601 for each "Small Scale Surface Infiltration Basin" with the depths shown in the Stormwater Report for the Water Quality Storm.
  13. The applicant should address how the "Current" and "Future" Rainfall events were considered in the stormwater design as per NJDEP requirements.