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Tighe&Bond Engineers I Environmental Specialists MANSELL FIELD SITE REMEDIATION AND IMPROVEMENTS CONCEPTUAL PLAN JANUARY 19, 2021 CITY OF SALEM, MA ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 2 Tighe&Bond Engineers I Environmental Specialists • Due diligence investigations conducted in November 2018 in prep for Gallows Hill Park renovation project. • elevated levels of arsenic detected in shallow soils on western portion of “Mansell Field” area, situated east of main Gallows Hill Park area. • Site history research indicated former tannery facility located on eastern portion of Mansell Field area circa late 1800s to early 1900s. City took ownership of Mansell Field area parcel in 1940. • Mansell Field area contains basketball court and a grass covered area that is sloped and not very “functional” field area. A 36-inch reinforced concrete pipe (RCP) stormwater line/ culverted stream crosses Mansell Field area. • Further investigations indicated more elevated arsenic levels in shallow soils on central portion of Mansell Field area; triggered Imminent Hazard condition under MCP regulations and MassDEP immediately notified. • Six-foot high chain link construction fence installed to restrict access for general public to Mansell Field. • Delineation of site contamination has been completed; included sampling soils across Mansell Field parcel as well as well as other portions of Gallows Hill Park and on neighboring properties. PROJECT BACKGROUND ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 3 Tighe&Bond Engineers I Environmental Specialists ESTIMATED ARSENIC BOUNDARIES IN SOIL 0-3 FEET BELOW SURFACE ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 4 Tighe&Bond Engineers I Environmental Specialists ESTIMATED ARSENIC BOUNDARIES IN SOIL 3-6 FEET BELOW SURFACE ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 5 Tighe&Bond Engineers I Environmental Specialists CONDITIONS OF ARSENIC IN SOIL A E H B F I C G J D 0 EXISTING FINISH GRADE ARSENIC > 500 mg/Kg ARSENIC > 100 mg/Kg ARSENIC > 20 mg/Kg ARSENIC < 20 mg/Kg Soil depth soil depth soil depth soil depth soil depth soil depth soil depth soil depth 0 EXISTING FINISH GRADE 0 EXISTING FINISH GRADE A B C C E F F F G D D G H H I I I I J J J A C G ARSENIC > 500 mg/Kg ARSENIC > 100 mg/Kg ARSENIC > 100 mg/Kg ARSENIC > 20 mg/Kg ARSENIC > 20 mg/Kg ARSENIC > 20 mg/Kg ARSENIC < 20 mg/Kg ARSENIC < 20 mg/Kg ARSENIC < 20 mg/Kg ARSENIC > 500 mg/Kg BETWEEN 0 TO -3 FEET DEPTH ARSENIC > 500 mg/Kg BETWEEN -3 TO -6 FEET DEPTH ARSENIC > 100 mg/Kg BETWEEN 0 TO -3 FEET DEPTH ARSENIC > 100 mg/Kg BETWEEN -3 TO -6 FEET DEPTH ARSENIC > 20 mg/Kg BETWEEN 0 TO -3 FEET DEPTH ARSENIC < 20 mg/Kg BETWEEN 0 TO -3 FEET DEPTH ARSENIC > 20 mg/Kg BETWEEN -3 TO -6 FEET DEPTH ARSENIC < 20 mg/Kg BETWEEN -3 TO -6 FEET DEPTH LEGEND ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 6 Tighe&Bond Engineers I Environmental Specialists MANSELL PARKWAY PROCTOR STREET WITCH HILL ROAD LANGDON STREET LOONEY AVENUE POPE STREET EXISTING PLAYGROUND EXISTING CHAIN-LINK FENCE EXISTING BASKETBALL COURT PARKING AREA EXISTING PAVED PATH ALONG FENCE LINE OF 12-14 LANGDON STREET EXISTING METAL FENCE SIDEWALK UNDERGROUND STORMWATER LINE SIDEWALK 12% 20% 3% 10% EXISTING CONDITIONS PROPERTY LINE PROPERTY LINE ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 7 Tighe&Bond Engineers I Environmental Specialists MANSELL PARKWAY PROCTOR STREET WITCH HILL ROAD LANGDON STREET LOONEY AVENUE POPE STREET 1 3 2 4 1 2 4 3 EXISTING PHOTOS ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 8 Tighe&Bond Engineers I Environmental Specialists WITCH HILL ROAD 1 2 2 1 3 4 3 4 EXISTING PHOTOS AT PLAYGROUND ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 9 Tighe&Bond Engineers I Environmental Specialists 1 2 1 2 3 4 3 4 EXISTING PHOTOS AT LANGDON STREET ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 10 Tighe&Bond Engineers I Environmental Specialists 0’ 10’ 20’ 40’ 280’ 110’ EXISTING PLAYGROUND BIO-RETENTION EXISTING SIDEWALK PROPERTY LINE EXISTING FENCE TO REMAIN EXISTING SIDEWALK MANSELL PARKWAY GALLOW HILL PARK - PARKING LOT SKATE PARK OPEN LAWN (1.5% CROSS SLOPE) PROCTOR STREET WITCH HILL ROAD LANGDON STREET LOONEY AVENUE EXISTING TREES TO REMAIN (REMOVE EXISTING FENCE) PARKING (1 HP+11 PARKING SPACES) NEW ACCESSIBLE PATH (4.5% MAX. SLOPE) NEW BENCH CONCEPTUAL SITE PLAN - OPTION1 POPE STREET EXISTING CATCH BASIN EXISTING TREE EXISTING TREE ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 11 Tighe&Bond Engineers I Environmental Specialists 0’ 10’ 20’ 40’ 255’ 110’ EXISTING PLAYGROUND GRANITE BLOCKS ON SLOPE NEW TREES BIO-RETENTION EXISTING SIDEWALK TO REMAIN PROPERTY LINE EXISTING FENCE TO REMAIN EXISTING SIDEWALK TO REMAIN NEW TREES GALLOW HILL PARK - PARKING LOT SKATE PARK OPEN LAWN (1.5% CROSS SLOPE) PROCTOR STREET WITCH HILL ROAD LANGDON STREET LOONEY AVENUE NEW BASKETBALL COURT (94’X50’) NEW TREES (REMOVE EXISTING FENCE AND EXISTING TREES ) PARKING (1 HP+11 PARKING SPACES) NEW ACCESSIBLE PATH (4.5% MAX. SLOPE) NEW BENCH CONCEPTUAL SITE PLAN - OPTION2 POPE STREET EXISTING CATCH BASIN EXISTING TREE EXISTING TREE MANSELL PARKWAY ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 12 Tighe&Bond Engineers I Environmental Specialists NEW BASKETBALL COURT OPEN LAWN OPEN LAWN OPEN LAWN SECTION A SECTION B SECTION C A B C PROCTOR STREET MANSELL PARKWAY MANSELL PARKWAY BIO-RETENTION SECTIONS ACCESSIBLE WALKWAY EXISTING FINISH GRADE PROPOSED FINISH GRADE PLAYGROUND EXISTING FINISH GRADE PROPOSED FINISH GRADE BENCH LANGDON STREET PARKING LOT PROPOSED FINISH GRADE EXISTING FINISH GRADE ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 13 Tighe&Bond Engineers I Environmental Specialists MANSELL PARKWAY GALLOW HILL PARK - PARKING LOT PROCTOR STREET WITCH HILL ROAD LANGDON STREET LOONEY AVENUE POPE STREET EXAMPLES OF SITE REMEDIATION F C I ARSENIC > 20 mg/Kg ARSENIC > 20 mg/Kg ARSENIC < 20 mg/Kg ARSENIC < 20 mg/Kg ARSENIC < 20 mg/Kg ARSENIC > 20 mg/Kg ARSENIC < 20 mg/Kg ARSENIC > 20 mg/Kg ARSENIC > 100 mg/Kg ARSENIC > 500 mg/Kg ARSENIC > 500 mg/Kg ARSENIC > 20 mg/Kg ARSENIC > 20 mg/Kg ARSENIC > 500 mg/Kg ARSENIC > 100 mg/Kg ARSENIC > 100 mg/Kg REMAIN REMAIN REMAIN REMAIN REMAIN REMAIN REMOVE AND RELOCATED / REMAIN REMOVE (OFF SITE) REMOVE (OFF SITE) 3 FEET CLEAN SOIL 3 FEET CLEAN FILL 3 FEET CLEAN FILL EXISTING ELEVATION +36’ EXISTING ELEVATION +37.5’ EXISTING ELEVATION +37’ EXISTING ELEVATION +36.2’ PROPOSED ELEVATION +36.8’ PROPOSED ELEVATION +37.8’ PROPOSED ELEVATION +39.5’ 3 FEET CLEAN FILL PROPOSED ELEVATION +37’ D ARSENIC > 100 mg/Kg EXISTING ELEVATION +35.2’ PROPOSED ELEVATION +37’ A ARSENIC > 100 mg/Kg F I D I C A NEW BASKETBALL COURT PAVEMENT EXISTING BASKETBALL COURT PAVEMENT 0’ 0’ 0’ 0’ 0’ 0’ 0’ 0’ 0’ 0’ RELOCATED ARSENIC > 500 mg/Kg ARSENIC > 500 mg/Kg RELOCATED REMOVE (OFF SITE) REMOVE (OFF SITE) ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 14 Tighe&Bond Engineers I Environmental Specialists SITE REMEDIATION AT STORMWATER PIPES MANSELL PARKWAY GALLOW HILL PARK - PARKING LOT PROCTOR STREET WITCH HILL ROAD LANGDON STREET LOONEY AVENUE POPE STREET C H ARSENIC > 20 mg/Kg ARSENIC > 20 mg/Kg ARSENIC > 500 mg/Kg ARSENIC > 20 mg/Kg ARSENIC > 500 mg/Kg G B REMOVE (OFF SITE) CLEAN FILL TO BOTTOM OF STORM- WATER PIPE CLEAN FILL TO BOTTOM OF STORM- WATER PIPE EXISTING ELEVATION +35.8’ EXISTING ELEVATION +36.5’ EXISTING ELEVATION +34.6’ EXISTING ELEVATION +34.2’ PROPOSED ELEVATION +37.8’ PROPOSED ELEVATION +37.2’ PROPOSED ELEVATION +35’ PROPOSED ELEVATION +34’ H C 0’ 0’ 0’ 0’ 0’ 0’ ARSENIC > 100 mg/Kg 0’ 0’ REMAIN REMAIN ARSENIC > 100 mg/Kg G B 10’ wide corridor along stormwater pipes CLEAN FILL TO BOTTOM OF STORM- WATER PIPE CLEAN FILL TO BOTTOM OF STORM- WATER PIPE PIPE PIPE PIPE PIPE ARSENIC > 500 mg/Kg REMOVE (OFF SITE) REMOVE AND RELOCATED / REMAIN REMOVE AND RELOCATED / REMAIN ARSENIC < 20 mg/Kg ARSENIC < 20 mg/Kg REMOVE AND RELOCATED / REMAIN REMOVE AND RELOCATED / REMAIN REMOVE AND RELOCATED / REMAIN ARSENIC > 20 mg/Kg ARSENIC > 20 mg/Kg ARSENIC > 100 mg/Kg PIPE PIPE PIPE PIPE ---PAGE BREAK--- MANSELL FIELD - SITE REMEDIATION AND IMPROVEMENTS Salem, MA January 19 2021 PAGE 15 Tighe&Bond Engineers I Environmental Specialists QUESTIONS ? CITY OF SALEM - MANSELL FIELD PROJECT PAGE //salem.com/mansellfield