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Page I 1 Proactive By Design. Our Company Commitment MARCH 2018, NOR-EASTER STORM DAMAGE SEAWALL ASSESSMENTS Salem, Massachusetts GZA GeoEnvironmental, Inc. COLUMBUS AVE SEAWALL LEACH/LAFAYETTE SEAWALL SOUTH RIVER/HARBORWALK SEAWALL ---PAGE BREAK--- Page I 2 Scope of Services Task 1 - Project Review Task 2 – Condition Inspection and Survey – Develop Existing Condition Plans Task 3 - Condition Assessment Letter Report Task 4 – Conceptual Design ---PAGE BREAK--- Page I 3 Columbus Avenue Seawall ---PAGE BREAK--- Page I 4 Columbus Avenue Seawall No Historic Information Found (pre-1938) Seawall is approximately 474 ft long Stone/Masonry Construction Elevation Varies from 10.1 to 8.5 in North American Vertical Datum 1988 (NAVD88) Good Condition, per Massachusetts Coastal Infrastructure Inventory and Assessment Project, by the Massachusetts Department of Conservation and Recreation, North Shore 2009 ---PAGE BREAK--- Page I 5 Columbus Avenue Seawall Observed to be in overall FAIR to POOR Condition • Loose/missing stones, • Deteriorated and missing mortar/cracks ---PAGE BREAK--- Page I 6 Columbus Avenue Seawall Typical voids and missing mortar along seaward face. Missing face stones and typical recent mortar repair. ---PAGE BREAK--- Page I 7 Columbus Avenue Seawall Typical voids and deteriorated and missing mortar/cracks in seaward face. Typical voids and deteriorated and missing mortar/cracks along top of wall. ---PAGE BREAK--- Page I 8 Columbus Avenue Seawall Granite block landing with loss of fill material below top course. Typical corroded pipe weep hole and voids along seaward face. ---PAGE BREAK--- Page I 9 Columbus Avenue Seawall ---PAGE BREAK--- Page I 10 Columbus Avenue Seawall ---PAGE BREAK--- Page I 11 Columbus Avenue Seawall ---PAGE BREAK--- Page I 12 Columbus Avenue Seawall Alt No. Repair Recommendation Wall Height Cost Estimate Alt No. 1 In-kind Repairs No Change $90k to $120k Alt No. 2A Reconstruct with Existing and Supplemental Stone +0.9-2.5 ft $550k to $700k Alt No. 2B Reconstruct with Large Cut Granite Stone +0.9-2.5 ft $750k to $900k Alt No. 3 Reconstruct with Reinforced Concrete Wall +0.9-2.5 ft $1.4m to $1.7m Alt No. 4 Reconstruct with Hybrid-Concrete and Stone Veneer Wall +0.9-2.5 ft $1.5m to $1.8m ---PAGE BREAK--- Page I 13 Columbus Avenue Seawall Alt No. 2A – Reconstruct with Existing and Supplemental Stone Pros • Less upfront cost • Increased flood protection • Aesthetics- most similar to existing Cons • Routine maintenance/upkeep • Less longevity/strength compared to concrete or larger stone ---PAGE BREAK--- Page I 14 Columbus Avenue Seawall Alt No. 2B – Reconstruct with Large Cut Granite Stone Pros • Medium upfront cost • Increased flood protection • Aesthetics- stone masonry Cons • Routine maintenance/upkeep • Material availability ---PAGE BREAK--- Page I 15 Columbus Avenue Seawall Alt No. 3 – Reconstruct with Reinforced Concrete Wall Pros • Increased longevity/strength • Increased flood protection • Minimal maintenance/upkeep • Optional form liners for aesthetic face Cons • Higher upfront cost • Aesthetics- least similar to existing ---PAGE BREAK--- Page I 16 Columbus Avenue Seawall Alt No. 4 – Reconstruct with Hybrid- Concrete and Stone Veneer Wall Pros • Increased longevity/strength • Increased flood protection • Aesthetics- stone veneer Cons • Higher upfront cost • Material availability • Maintenance to stone veneer ---PAGE BREAK--- Page I 17 Columbus Avenue Seawall ---PAGE BREAK--- Page I 18 Columbus Avenue Seawall ---PAGE BREAK--- Page I 19 Columbus Avenue Seawall January 2018 ---PAGE BREAK--- Page I 20 In Closing… DRAFT REPORT “WORKING VERSION” REVIEW WITH THE CITY PERMITTING/CONSTRUCTION IMPLICATIONS IDENTIFY FUNDING OPPORTUNITIES LOOK AT ADDITONAL SERVICES…. ---PAGE BREAK--- Page I 21 Questions