HomeMy WebLinkAboutPeer Review Memo 1 6.27.2025Comprehensive Environmental Inc. ● Bolton, MA ● Merrimack, NH ● New Britain, CT ● www.ceiengineers.com
Brittany DiRienzo June 27, 2025
Conservation Administrator
Town of Yarmouth
1146 Route 28
South Yarmouth, MA 02664
Re: Peer Review Services
1282 Route 28
South Yarmouth, MA
Dear Ms. DiRienzo:
As requested by the Town of Yarmouth, CEI has completed a technical review of the materials and
information listed below for the proposed development project located at 1282 Route 28 in South
Yarmouth, MA.
The proposed redevelopment property will demolish all existing buildings on site and construct (1) a
gasoline filling station with four fueling dispensers, an overhead steel canopy, and two double-walled
fiberglass fuel storage tanks; (2) a 3,890 square-foot building with convenience store with a drive-thru;
and (3) a two-story building with 4 residential units along the southeast corner of the property.
This letter includes the findings of our review of the stormwater design components for the proposed
project and compliance with the Massachusetts Stormwater Management Standards and the Town of
Yarmouth Stormwater Regulations. CEI’s review is based on the following documents prepared by
Choubah Engineering Group, P.C.:
a. Stormwater Management Report, dated April 2, 2025
b. Site Plans, dated April 2, 2025
Stormwater Comments
1. The development proposes three subsurface infiltration systems designed to completely infiltrate
runoff generated from the 100-year storm event, however, the following assessments must be
performed to ensure the system will function properly:
a. Test pit must be performed at the location and soil layer of all proposed infiltration systems to
confirm infiltration capacity. A test pit was not performed at the location of System #1 or #3.
b. A mounding analysis is required when the vertical separation from the bottom of an
exfiltration system to estimated seasonal high groundwater is less than four (4) feet and the
recharge system is proposed to attenuate the peak discharge from a 10-year or higher 24-hour
storm (e.g., 10-year, 25-year, 50-year, or 100-year 24-hour storm). The average separation to
COMPREHENSIVE
ENVIRONMENTAL
INCORPORATED
41 Main Street
Bolton, MA 01740
508.281.5160
Comprehensive Environmental Inc. ● Bolton, MA ● Merrimack, NH ● New Britain, CT ● www.ceiengineers.com
June 23, 2025
Page 2
estimated seasonal high groundwater is just below 4 feet (El. 16.11) based on the test pits
provided. The bottom of the stormwater chambers for System #1, 2, & 3 is at El. 20.00.
c. Note, per the Yarmouth Stormwater Regulations, the estimated seasonal high groundwater
elevation must be adjusted using the Cape Cod Commission adjustment method (Technical
Bulletin 92- 001, as amended) in areas to be used for stormwater infiltration.
2. Per the Yarmouth Stormwater Regulations, redevelopment projects must achieve 50% total
phosphorus (TP) and 30% total nitrogen (TN) removal in addition to 80% TSS removal from all
impervious area under post-construction conditions. Please document how the project meets TP
and TN removal requirements in the Stormwater Report.
3. Note the following information on the erosion and sediment control plan:
a. For the subsurface infiltration systems, accomplish any required excavation with equipment
placed just outside of this area. If the size of the area intended for exfiltration is too large to
accommodate this approach, use trucks with low pressure tires to minimize compaction. Keep
the area above and immediately surrounding the subsurface structure roped off to all
construction vehicles until the final cover is installed (either paving or landscaping).
b. Per the Yarmouth Stormwater Regulations, a description of vehicles and equipment
fueling procedures, including how fuels and other vehicle maintenance substances will be
stored and handled during construction.
4. Note the following information in the O&M plan.
a. The proposed Grading and Drainage Plan does not include Infiltration Ditches. If infiltration
ditches are not proposed, the O&M plan should remove this reference in the inspection and
maintenance procedures.
b. Restrictions on the application of fertilizers are required per Section 2.05(2)d of the
Yarmouth Stormwater Regulations.
We appreciate the opportunity to provide the Town with peer review services. If you have any questions
or comments regarding this report, please contact me at 774-843-2007 or cosullivan@ceiengineers.com.
Sincerely,
COMPREHENSIVE ENVIRONMENTAL, INC.
Conor O’Sullivan
Project Review Engineer
Pareena Deva, P.E.
Project Manager