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Home My WebLink AboutSculpture Mod Request (2023-03-23) no check Marlborough Technology Park 100 Nickerson Road, Marlborough, MA 01752 Tel 508.786.2200 Fax 508.786.2201 tetratech.com March 23, 2023 Ms Darcy Karle, Conservation Administrator Barnstable Conservation Commission 230 South Street Hyannis, MA 02601 Re: Plan Revision - Sculpture DEP File No. SE3-5767 Rushy Marsh Farm Japanese Pavilion 1541 Main Street Cotuit, MA Dear Ms. Karle: This letter, completed Form R, and attached supporting documentation requests Commission approval of a minor plan revision to the above-referenced Order of Conditions to install a sculpture as shown on Figure 1. The work includes installation of a 2’ x 24’ sculpture base that will extend 1-2 feet above grade to support a 10- foot (+/-) tall sculpture commissioned by the owner (see attached photo of artist’s mock-up). Work: The work includes excavating a 30’(L) x 4’(W) x 5’(D) trench for construction of a reinforced concrete footing and wall (detail per approved plans) to support the sculpture and installation of a 15” diameter Weeping Willow. The sculpture base will be constructed using a backhoe or small excavator and the willow will be installed using a tree spade to limit disturbance. Backfill material will be stockpiled temporarily on the uphill side of the trench and any excess material will be removed immediately from the site. All surfaces will be returned to their original condition following installation of the sculpture. The sculpture will be delivered to the site by truck and erected with a mobile crane. Both vehicles will be mobilized from the existing driveway and any areas disturbed during erection will be repaired immediately. Schedule: We anticipate installation of the sculpture base will take approximately 5-7 days after which all materials and equipment will be removed and any areas disturbed during installation will be repaired immediately by re-sodding leaving no potential for erosion. When finished, the sculpture will be delivered to the site by truck and erected with a mobile crane. Both vehicles will be mobilized from the existing driveway and any areas disturbed during erection will be repaired immediately. Erosion Controls: A row of 12” compost filter tube will be installed as shown on the attached plan to ensure protection of adjacent wetlands. Erosion controls will remain in place until sculpture is installed, and all related repair work is complete Mitigation: The work will result in 48 sf of new impervious surface within the 0-50’ wetland buffer requiring an additional 192 sf (4:1 mitigation ratio). The change results in a revised total required project mitigation of 4,556 sf which is still far less than the 14,448 sf being provided. A copy of the approved and revised Mitigation Summary is attached. We anticipate the Project and the additional work described in this request will be complete by September 2023. An extension of the OOC was requested on March 15, 2023 and is currently pending. Plan Revision - Sculpture Rushy Marsh Farm Japanese Pavilion March 23, 2023 TETRA TECH 2 Enclosed is a completed Form E, original documentation (including 2 stamped Figure 1), a check in the amount of $50 and 8 collated copies of the request. If you have any questions or require any additional information, please don’t hesitate to contact me directly by email at sean.reardo@tetratetch.com or by phone at 508-786-2230. Very truly yours, Sean P. Reardon, P.E. Vice President P:\89057\143-89057-21002\DOCS\SCULPTURE MOD REQUEST.DOCX Sculpture – Bench Scale Mock-Up Mitigation Summary Structure Woods Pine Needle Path/Stepping Stones Sand Bed/Stone Mulch Existing Conditions 53,864 0-50 FT Buffer 0 28,157 840 0 29,122 50-100 FT Buffer 0 23,955 787 0 24,742 Proposed Conditions 53,864 0-50 FT Buffer 0 28,401 406 53 29,122 50-100 FT Buffer 570 22,430 969 71 24,742 Net Alteration 0-50 FT Buffer 0 244 -434 53 50-100 FT Buffer 570 -1,525 182 71 Existing Buffer Zone Disturbed Area to be Removed Net Area (SF)Mitigation Requirement Required Mitigation (SF) Proposed Mitigation (SF) (SF) 0-50 FT Buffer 0 185 4 to 1 740 7,602 50-100 FT Buffer 0 1,272 3 to 1 3,816 6,846 4,556 14,448 Note: Sculpture is outsdie original analysis area . Additional 48 sf impervious within 0-50' added to Table 2 only. Table 1 Alteration Summary - Existing vs. Proposed Hardscape Softscape Total (SF)Stone Walls, Pavers & Water Feature 137 702 125 53,739 125 0 1,534 52,330 185 262 702 1,409 -1,409 1,272 Tetra Tech Sculpture Mod 1541 Main Street 22-Mar-23 Cotuit, MA Japanese Garden, Paviliion and Sound Wall Table 2 Mitigation Summary Proposed Impact (SF) Mitigation Summary Japanese Garden, Pavilion and Sound Wall 1541 Main Street Cotuit, MA Tetra Tech February 19, 2020 Rev. February 28, 2020 Rev. March 4, 2021 Structure Stone Walls, Pavers & Water Feature Woods Pine Needle Path/Stepping Stones Sand Bed Existing Conditions 53,864 0-50 FT Buffer 0 125 28,157 840 0 29,122 50-100 FT Buffer 0 0 23,955 787 0 24,742 Proposed Conditions 53,864 0-50 FT Buffer 0 262 28,401 406 53 29,122 50-100 FT Buffer 570 702 22,430 969 71 24,742 Net Alteration 0-50 FT Buffer 0 137 244 -434 53 50-100 FT Buffer 570 702 -1,525 182 71 Buffer Zone Existing Disturbed Area to be Removed (SF) Proposed Impact (SF) Net Area (SF) Mitigation Requirement Required Mitigation (SF) Proposed Mitigation (SF) 0-50 FT Buffer 0 137 137 4 to 1 548 7,602 50-100 FT Buffer 0 1,272 1,272 3 to 1 3,816 6,846 4,364 14,448 Hardscape 125 1,534 Softscape 53,739 52,330 Total (SF) Table 1 Alteration Summary - Existing vs. Proposed 1,409 Table 2 Mitigation Summary -1,409 C:\Users\sean.reardon\AppData\Local\Microsoft\Windows\INetCache\Content.Outlook\PIQEP5TK\Alteration-Mitigation Summary (2021-03-09).xlsx