Commission discusses remediation plan after riprap replaced planned vegetation at The Delaney at The Vail

Woburn Conservation Commission members on the agenda reviewed a proposal (DP 348826) for The Delaney at The Vail to apply an organic geo-earth material and seed to a riprap slope that had been constructed where the approved plan called for vegetation.

Jake Quattrocki, senior wetland scientist with VHP, said the slope “was originally planned to be vegetated, but, when it was constructed, they kept it entirely riprap. So now we're trying to come forward with the best solution that we think will work, try to get some vegetation on that slope.” He described the planned treatment as similar to a hydroseed application, with the product sprayed onto and between rocks and seed applied on top.

The commission’s discussion focused on technical details that were not in the packet. Commissioners asked whether the material would be sprayed from a truck or applied with hoses on the slope, how well the spray would penetrate crevices between riprap, the recommended application depth or rate, and how the treatment would be watered and maintained until vegetation established. Quattrocki said the applicant had asked the subcontractor for details from Geo Earth but had not yet received them and offered to be on-site to oversee the application to ensure material reached crevices.

Commissioners also raised concerns about runoff and erosion during initial establishment and asked whether erosion controls at the base or intermediate points on the slope would be used. Quattrocki said he has used the material on another, less-steep site but has not yet seen a full growing season to assess longevity; he agreed additional monitoring would be weather-dependent and could require reapplication if material washed off.

The commission asked staff and the applicant to obtain and file additional technical documentation from Geo Earth before a final decision, including recommended application rates, evidence of use on steep riprap slopes, and any runoff/erosion calculations. The commission also directed that an on-site oversight and a follow-up reporting plan be provided; the applicant indicated work would likely occur in early spring (April) and that timing would remain weather-dependent.

At the meeting the commission also approved a change to the routine inspection schedule for the overall site from monthly to quarterly, with the understanding that more frequent monitoring would occur while the riprap treatment was applied and during the initial establishment period. The motion to move to quarterly inspections with additional, as-needed monitoring during and after the riprap treatment was seconded and carried by voice vote; the transcript records the motion as approved but does not record roll-call tallies.

Why it matters: The slope sits where construction replaced the approved vegetated plan with riprap; restoring vegetation could reduce long-term erosion and improve habitat if the application and follow-up succeed. Commissioners signaled they will withhold final approvals pending submission of the missing technical details and a monitoring plan.

Next steps: The applicant will obtain and submit Geo Earth technical specifications (application rate and method, prior steep-slope experience, runoff calculations), confirm a proposed spring start date, and provide an on-site oversight and follow-up reporting schedule for the commission to review at a future meeting.