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Commission rushes to redesign stormwater project after NJDEP rejects key device, grant at risk
Summary
Commission consultants told members that NJDEP rejected the previously planned vortex treatment devices and required certified manufactured treatment devices meeting an 80% TSS removal rate; revised plans must be submitted by Jan. 16 to avoid losing grant funds.
Consultants told the Watershed Commission on Jan. 15 that the New Jersey Department of Environmental Protection had rejected the project’s planned VORTEX stormwater treatment devices and required use of DEP-approved manufactured treatment devices that meet an 80% total suspended solids (TSS) removal rate.
The commission’s consultants said the DEP’s requirement — and a Jan. 16 deadline in a DEP email — means the commission must submit revised plans immediately or risk the agency refusing the grant disbursement. The commission’s presenter (identified in the meeting transcript as Presenter) summarized two DEP-approved alternatives: a soil‑matrix “Filterra” (tree‑box filter) style system and nutrient‑separating baffle boxes (NSBBs). The presenter said both alternatives are compliant with DEP’s MTD list but are more expensive and may require removal of existing on‑site structures.
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