Municipal

The City of Portland Department of Public Services contracted with Gorrill Palmer to assist with the final collaboration, review and design of this park preservation project on Eastern Promenade. Our involvement began towards the end of a long period of research, design, permitting and public process that was undertaken by the Friends of Eastern Promenade and their consultants, Martha Lyon Landscape Architecture, LLC and Regina S. Leonard Landscape Architecture & Design. Gorrill Palmers role was to provide design assistance with the stormwater management, access road, utilities, and pedestrian walkways. In addition we facilitated and managed the preparation of the bid documents and provided periodic construction administration assistance.

The overall goal of the project was to restore several of the original park features, including shade trees along the park side of the Promenade, central walkway leading to the bandstand, original loop road layout with cobblestone edges, and low shrub planting beds. In addition two pathways leading from the Promenade to the lower terrace were re-introduced and will connect to the two contemporary memorial sites. The overlook was reconstructed to allow full access for all people to enjoy the views.

Client: City of Portland

Services Provided:
• Stormwater Management & Design
• Roadway Design
• Low Impact Development Design
• Construction Inspection

Gorrill-Palmer was selected by the City of Portland to prepare design plans for the separation of storm drainage from the existing sanitary sewer system in the Bartley Avenue residential neighborhood of Portland as part of the Tier II Abatement plan. This project was a continuation of the sewer separation work within the Fall Brook Watershed.

The Bartley and Rustic neighborhood is located within the upper reaches of the Fall Brook watershed. Fall Brook is listed as an Urban Impaired Stream by the Maine Department of Environmental Protection. The Bartley to Rustic project included about 1,800 linear feet of new 8 inch to 21 inch sanitary sewer pipe, over 3,000 linear feet of new 10 inch to 18 inch storm drain pipe and over 70 new catch basin and manhole structures.

In addition the City requested that we evaluate stormwater treatment options for the project. We designed a gravel wetland treatment system on the Lyseth Moore School property, which is located just downstream from Bartley Avenue. This system was designed to treat runoff from about 7.3 acres of parking lot and 13.1 acres of landscaped area on the school grounds.

Client: City of Portland

Services Provided:
• Combined Sewer Separation
• Sewer Design
• Storm Drain Design
• Stormwater Quality Treatment
• Green Infrastructure & LID Design
• Roadway Reconstruction
• Construction Inspection

Westwood Road in Gray, Maine is a dead-end road providing access to about 140 year-round and seasonal camps along the northern end of Little Sebago Lake. The Town of Gray has spent considerable time and funds over the years repairing and replacing the road where it crosses over Sucker Brook, which is a flashy tributary to Little Sebago. Spring flooding often damaged or washed out the road to a point where it became unpassable, sometimes for several days. This was of concern to the residents and Public Safety as it prevented access by emergency vehicles and economic losses to the residents.

Gorrill Palmer prepared a successful Federal Emergency Management Agency Hazard Mitigation Grant application for this project and the Town was awarded a grant funding 75% of eligible design and construction costs to upgrade the existing culvert to help mitigate the flooding and reduce road closure time.

The project included replacing the existing 6 foot diameter corrugated metal pipe and degraded concrete headwalls with a new 10 foot span by 8 foot rise, three sided, precast concrete box culvert with gabion headwalls. The new structure was sized to pass the 100 year flood event without overtopping the road. The new open bottom culvert also provided a significant improvement to fish passage and will also reduce sedimentation of the downstream brook channel caused by the regular washouts in the past. The project required a Category 2 General Permit from the Army Corps of Engineers.

Client: Town of Gray

Services Provided:
• Minor Span/Culvert Design
• Road Reconstruction
• Permitting
• Construction Observations

Gorrill Palmer completed the design, permitting and construction administration for the Lawrence Road Bridge replacement on Lawrence Road in Gray, Maine. The existing concrete abutment and steel beam bridge with 18 foot span and 8 foot rise was replaced with a multi-plate arch culvert with 28.5 foot span by 6.5 foot rise. Corrugated metal end and wing walls were used to minimize further impacts to the Pleasant River. The project required an Army Corps of Engineers Category 2 General Permit. The existing concrete bridge abutments were partially removed and used to assist with dewatering during the construction process. New cast-in-place concrete footings were poured behind the existing abutments.

We assisted the Town throughout the bidding process and provided construction administration services, including: periodic site visits and field reports, daily coordination with the contractor, providing clarification of the bid documents and review of applications for payment.

Client: Town of Gray

Services Provided:
• Minor Span/Culvert Design
• Road Reconstruction
• Permitting
• Construction Administration

Gorrill Palmer has completed pavement condition studies for over 15 municipalities. In many of these communities we have continued to provide updated evaluations and reports every few years. Pavement generally represents the largest capital investment for any municipality and maintaining that investment involves knowledge and decisions on the timing and type of preservation treatments to apply. Typically these decisions have been left up to the public works director or road commissioner and have been based on availability of funding, knowledge and experience. Pavement management is more scientifically-based and involves the regular/consistent collection of pavement condition data, a computer database to store the data, and computer software to analyze the data and recommend pavement preservation strategies and associated costs. We are familiar with several methodologies and software packages, including:

· ASTM D6433 – Standard Practice for Roads and Parking Lots Pavement Condition Index Surveys
· Visual Condition Survey for Flexible Pavements
· MicroPaver and Field Inspector software
· Road Surface Management System (RSMS) software

MicroPaver software is based on the ASTM D6433 standard practice and quantifies nineteen different types of pavement distresses. The Visual Condition Survey and RSMS systems are less rigorous than the ASTM method, but still provide beneficial results.

Benefits of pavement management include:
• Prioritize Funding for Pavement Overlays
• Assist with Planning for Future Expenditures
• Justification of Roads Chosen for Overlays
• Identification of Roads in Need of Reconstruction Versus an Overlay

Gorrill Palmer has completed pavement management studies for the following municipalities:
• City of Auburn – 150 miles
• Town of Cape Elizabeth – 63 miles
• Town of Cumberland – 72 miles
• Town of Dover-Foxcroft – 46 miles
• Town of Falmouth – 90 miles
• Town of Gray – 75 miles
• Town of Harpswell – 27 miles
• Town of Kittery – 35 miles
• City of Lewiston – 184 miles
• Town of Old Orchard Beach – 69 miles
• City of Portland – 240 miles
• Town of Sebago – 35 miles
• Town of Windham – 100 miles
• Town of Winslow – 70 miles
• Town of Yarmouth – 67 miles


Services Provided:
• Pavement Management