Arrow Street peer review narrows Acton DPW building options; committee to seek more analysis

Arrow Street, the consultant retained to peer-review the Town of Acton Department of Public Works (DPW) facility project, presented five options — labeled Option 1, 2, 3, 4A and 4B — at the DPW Building Committee meeting on Sept. 24 at Acton Town Hall.

The presentation compared area, program fit, constructability, phasing implications and cost. Arrow Street’s presenters said the options differ in how much of the existing building is retained, how many vehicles could be stored, whether seismic upgrades are triggered and the likely energy performance. “We think Option 4A is the most promising,” Andrea said, adding that it met the most criteria in their scoring matrix while costing substantially less than the original Weston & Sampson 40% DD set.

Why this matters: committee members repeatedly emphasized that the choice will shape a capital request likely to go to town meeting and possibly a debt-exclusion vote. The options’ total project estimates discussed at the meeting ranged from low- to mid‑tens of millions for individual components up to roughly $39 million for the Weston & Sampson baseline after escalation; the differences affect whether voters will support a project and how long the town can defer future work.

Key findings and numbers

- Arrow Street compared the consultant-originated Weston & Sampson 40% design-development (40% DD) set to five alternatives they developed to reduce cost and scope. Weston & Sampson’s estimate dated March 27 was cited at $29,780,000 for construction and a project estimate of about $37,000,000; Arrow Street applied a 6% escalation and presented a comparable escalated figure of roughly $39,000,000.

- Arrow Street’s alternatives: one reduced the Weston & Sampson footprint (Option 1), one renovated the existing building without meeting program needs (Option 2), one combined demolition and addition (Option 3), and two hybrid approaches reusing portions of the existing building while building new fleet storage (Options 4A and 4B).

- Explicit figures given in the presentation included a construction total for Option 3 of about $22,000,000 and a construction total for Option 4A of $26,689,006 (presented on the committee handout). Option 4B was discussed in the $23–23.5 million neighborhood for construction in one slide and later presented in a project-estimate column near $29,000,000; Arrow Street said it would provide final reconciled numbers in the written report. Andrea said one early reduced-footprint scheme had a construction cost “a little over $27,000,000” before project-level multipliers were applied.

- Energy systems: Arrow Street’s estimates assume air-source heat pump systems for the options shown. The consultants said they did not include ground-source (geothermal) systems in the cost estimates; adding a ground-source system would raise initial costs and would need separate pricing.

- Wash bay and wash-station work: the consultants said a dedicated wash bay was not included in the baseline pricing for most options and would be an add-on in many scenarios; some options provide room to add a wash bay in the future while others would require more site work and grading to accommodate it.

Committee discussion and concerns

Committee members and Select Board representatives asked detailed questions about phasing, long-term operating costs, storage, seismic work and community impacts on nearby Forest Road residents. Greg, a committee member, praised the report as a “soup to nuts” summary that gives all stakeholders a consistent set of data to debate. Tom, a committee member, pressed whether eliminating phasing and relocating operations off-site during construction would materially reduce cost; Arrow Street said it could reduce some logistics costs but did not present a firm dollar figure without further study.

Several members emphasized lifecycle or operating-cost comparisons. Brewster (resident) and others urged that the committee ask Arrow Street to provide a life‑cycle cost analysis comparing operating and maintenance costs (heating, O&M, equipment replacement) over decades so voters and the Finance Committee can weigh upfront construction cost against long‑term energy and O&M savings. Multiple speakers noted the consultants’ choice to price air-source heat pumps across options and requested that Arrow Street add life‑cycle or 20–50 year cost comparisons when presenting to other town bodies.

Design trade-offs raised during public and committee comment included:

- Storage capacity: Option 4B would repurpose much of the existing structure and provide storage for approximately 18 trucks versus the Weston & Sampson 31‑vehicle baseline; several members described 18 as likely insufficient for full winter fleet needs.

- Envelope and energy performance: renovating the existing building (Options 2, 3, 4A/4B) does not include a full thermal-envelope replacement in the consultants’ pricing; Arrow Street said that will make renovated components less energy-efficient than new construction, and that omission affects operating-cost comparisons.

- Seismic upgrades and structural risk: Arrow Street said some renovation paths (notably Option 4B in the presentation) would trigger seismic upgrades, which Arrow Street included in its price for that option.

Decisions, follow-up and process

The committee did not take a vote on a preferred option. Members asked Arrow Street for a final written report with detailed backup, reconciled cost figures and a life‑cycle cost analysis. Committee members and staff arranged the following next steps at the meeting:

- Arrow Street will present to the Select Board on Oct. 20 (consultants confirmed availability).

- The committee recommended asking Arrow Street to appear before the Finance Committee (draft plan discussed for Oct. 14) to answer budgetary questions; staff will confirm availability and possible change-order logistics.

- The DPW Building Committee tentatively scheduled an internal follow-up meeting for the week of Oct. 13 (members discussed Oct. 15 or Oct. 16) to refine a recommendation to the Select Board after receiving Arrow Street’s final materials and to include absent committee members (Corey).

Votes and formal actions

No formal construction, appropriation or recommendation vote was held. The only recorded committee motion at the meeting was a procedural motion to adjourn, which passed by voice vote.

Ending

Arrow Street’s presenters said they will supply a final report that reconciles the various line-item numbers, clarifies where wash bays and mezzanine storage fit in each option, and provides the backup analyses requested — including the mechanical-system assumptions used for the air-source heat-pump pricing. Committee members said they want life-cycle operating-cost comparisons included when Arrow Street presents to the Finance Committee and the Select Board. The committee left the meeting without selecting a preferred option and with the expectation of additional analysis and public briefings ahead of any town meeting or debt-exclusion decision.