The commission tackled alarming discrepancies in the solar farm’s stormwater basins, as highlighted in a report by engineering firm Weston and Samson. The firm noted that the as-built plans submitted to the planning board did not align with the approved designs, raising red flags about the integrity of the project’s stormwater management systems. One of the major points of concern was the embankment elevation, which differed by as much as seven feet from the original design specifications. This variance, coupled with mismatched outlet pipe inverts, left the adequacy of the basins indeterminate, prompting further inquiry and necessitating a comprehensive hydrology and hydraulics analysis.

The commission expressed significant apprehension regarding the potential impact of these discrepancies, particularly the risk of water overtopping and bypassing the riprap spillways. Concerns were voiced about possible flooding issues and failures in water quality treatment, which could have far-reaching implications for the surrounding infrastructure and safety.

In light of these findings, the commission recommended that the applicant conduct a comprehensive analysis to verify that the as-built conditions meet the original design intentions. The discussion also touched upon the gap in oversight following the departure of a key inspector, which had left the commission uneasy about the adequacy of site inspections during construction. The commission underscored the importance of ongoing monitoring and collaboration with the planning board to address the identified structural concerns and ensure the project’s compliance with stormwater regulations.

Amid these deliberations, a separate discussion unfolded regarding a significant violation of wetland regulations by a construction crew. The crew had cut a road into a wooded area, encroaching upon a vernal pool and failing to adhere to established no-touch zones. This prompted immediate intervention and a cease and desist order from town officials. The crew’s lack of awareness and training about the environmental restrictions was highlighted as a critical oversight. In response, the project owner was required to draft a restoration plan for the Conservation Commission, involving detailed remediation efforts overseen by a wetland scientist.

The commission also addressed ongoing concerns with another project involving three house lots requiring stormwater permits. Weston and Samson had been engaged to create boilerplate terms and conditions for these permits, which were necessary due to the project’s advanced stage. The commission noted that permits could not be issued without clear terms, delaying approval until conditions were prepared. A need for accountability and monitoring of compliance with the permit conditions was emphasized, given concerns about the site being exposed during winter months.

In addition, the commission discussed the Brook Street solar project, particularly the replacement of dead plantings and the condition of a stormwater basin. It was noted that the basin had failed to drain completely within the designated 72-hour period, prompting a request for engineering assessment before any modifications. This issue, alongside the project’s power generation capabilities and concerns about stormwater drainage, was addressed with input from project representatives and commission members.