Melville Water Tower Soil Excavation Completion

Melville Water Tower Soil Excavation Completion

MELVILLE WATER TOWER -

Introduction

MELVILLE WATER TOWER -

Introduction Tower consisted of a 50,000-gallon elevated tank on a steel tower.

Tower was constructed in 1930s to provide fire protection to the fueling facilities at Melville Marina Area.

Previously surrounded by a locked chain-linked fence.

Located adjacent to the Melville Elementary School.

Lead found in soil as a result of paint on the tower applied and removed between the 1940s and the 1990s.

Tower consisted of a 50,000-gallon elevated tank on a steel tower.

Tower was constructed in 1930s to provide fire protection to the fueling facilities at Melville Marina Area.

Previously surrounded by a locked chain-linked fence.

Located adjacent to the Melville Elementary School.

Lead found in soil as a result of paint on the tower applied and removed between the 1940s and the 1990s.

Photo May 2006

MELVILLE WATER TOWER – Discovery TimelineMELVILLE WATER TOWER – Discovery Timeline

Paint Chips found on the ground in early September 2005.

A secondary fence was erected September 2005.

Navy picked up chips twice daily late September 2005 through June 2006.

Navy, the school, and Rhode Island Department of Health met withparents 10/6/05.

Navy provided transportation to students from the development tothe south.

Rhode Island DEM conducted initial soil screening tests December2005.

Paint Chips found on the ground in early September 2005.

A secondary fence was erected September 2005.

Navy picked up chips twice daily late September 2005 through June 2006.

Navy, the school, and Rhode Island Department of Health met withparents 10/6/05.

Navy provided transportation to students from the development tothe south.

Rhode Island DEM conducted initial soil screening tests December2005.

DISCOVERYDISCOVERY

Concentration of Lead >150 mg/kg (RDEC)Concentration of Lead > 500 mg/kg (ICDEC)Concentration of Lead >1000 mg/kg

Route

114

Results reported by RIDEM, March 2006 screening resultsSurface Soil, 0-3 inches

SOIL INVESTIGATIONSOIL INVESTIGATION

PROJECT STARTUPPROJECT STARTUP

Contract specificationsContractor selectionDesign the action planLocate disposal facilitiesAddress local utilitiesTraffic planPublic meetingSet the schedule

Contract specificationsContractor selectionDesign the action planLocate disposal facilitiesAddress local utilitiesTraffic planPublic meetingSet the schedule

EXCAVATION PLANEXCAVATION PLAN

SOIL REMOVAL OVERVIEWSOIL REMOVAL OVERVIEW

Removal Included:

• Removal of some of the trees at the south side.

• Removal of soil up to 2 or more feet below ground surface under the tower area.

• Confirmation sampling and re-excavation of some areas.

• Removal of the old concrete footings, confirmation samples collected again.

• Removal of surface soil across most of the rest of the site.

• Backfill with clean soil and re-seed.

Removal Included:

• Removal of some of the trees at the south side.

• Removal of soil up to 2 or more feet below ground surface under the tower area.

• Confirmation sampling and re-excavation of some areas.

• Removal of the old concrete footings, confirmation samples collected again.

• Removal of surface soil across most of the rest of the site.

• Backfill with clean soil and re-seed.

CRITERIA FOR LEAD IN SOILCRITERIA FOR LEAD IN SOIL

Criteria applicable to lead in soil

• RIDEM Exposure Criteria for residential soil: 150 mg/kg

• Note: lead based paint contains >50,000 mg/kg

Criteria applicable to lead in soil

• RIDEM Exposure Criteria for residential soil: 150 mg/kg

• Note: lead based paint contains >50,000 mg/kg

EXCAVATIONEXCAVATION

Removed:• two feet of soil in “Area

A”; • six inches of soil from

“Area B”; • one additional foot of soil

from area C (a subset of area A); and

• additional soil as needed from around the footings and foundations.

Confirmation samples collected.

Additional excavation performed in some areas to achieve goals.

Removed:• two feet of soil in “Area

A”;• six inches of soil from

“Area B”;• one additional foot of soil

from area C (a subset of area A); and

• additional soil as needed from around the footings and foundations.

Confirmation samples collected.

Additional excavation performed in some areas to achieve goals.

CONTAMINANT CONTROL

CONTAMINANT CONTROL

Soils maintained wet to assure dust would not travel.

No stockpiles of soil were allowed on site.

Dust monitoring was conducted daily.

All monitor results showed no transfer of contaminants.

Soils maintained wet to assure dust would not travel.

No stockpiles of soil were allowed on site.

Dust monitoring was conducted daily.

All monitor results showed no transfer of contaminants.

DECONTAMINTATIONDECONTAMINTATION

Trucks moving in and out stayed on clean areas for loading.

Paved area only used to access site.

All trucks leaving site were decontaminated prior to departure onto paved areas.

Trucks moving in and out stayed on clean areas for loading.

Paved area only used to access site.

All trucks leaving site were decontaminated prior to departure onto paved areas.

CONFIRMATION SAMPLING

CONFIRMATION SAMPLING

Confirmation samples taken 10 feet apart.

Total 417 samples.

All samples analyzed by laboratory certified in the State of Rhode Island.

Areas where results showed lead > 150 mg/kg were re-excavated.

Samples split for quality assurance.

Samples also analyzed for other metals.

Confirmation samples taken 10 feet apart.

Total 417 samples.

All samples analyzed by laboratory certified in the State of Rhode Island.

Areas where results showed lead > 150 mg/kg were re-excavated.

Samples split for quality assurance.

Samples also analyzed for other metals.

FOUNDATIONS AND FOOTINGS FOUNDATIONS AND FOOTINGS

Concrete footings demolished after soil removal goals were met.

Concrete removed and disposed of as construction waste.

Existing water line removed to the edge of property and capped.

Concrete footings demolished after soil removal goals were met.

Concrete removed and disposed of as construction waste.

Existing water line removed to the edge of property and capped.

OVERSIGHT AND QCOVERSIGHT AND QC

Tetra Tech provided oversight of the excavation contractor.

Navy provided oversight of both Tetra Tech and their subcontractors.

Split samples with different labs to assure compliance.

RIDEM inspected site and conducted limited photo-documentation.

Tetra Tech provided oversight of the excavation contractor.

Navy provided oversight of both Tetra Tech and their subcontractors.

Split samples with different labs to assure compliance.

RIDEM inspected site and conducted limited photo-documentation.

DISPOSALDISPOSAL

“Hazardous” soil taken to EQ Detroit, Michigan.

Transportation via truck to Providence, transferred to rail cars.

Total “hazardous” soil = 614 Tons (approximately 400 cubic yards).

“Hazardous” soil taken to EQ Detroit, Michigan.

Transportation via truck to Providence, transferred to rail cars.

Total “hazardous” soil = 614 Tons (approximately 400 cubic yards).

DISPOSAL (continued) DISPOSAL (continued)

Non- hazardous soils taken to tank farm 5 and staged in a specific holding area:• Soils characterized for

disposal. • Used for daily cover at

Crapo Landfill New Bedford MA.

Total of 929 tons of non-hazardous soil (approximately 620 cubic yards).

Concrete disposed of at BFI Fall River Massachusetts.

Non- hazardous soils taken to tank farm 5 and staged in a specific holding area:• Soils characterized for

disposal.• Used for daily cover at

Crapo Landfill New Bedford MA.

Total of 929 tons of non-hazardous soil (approximately 620 cubic yards).

Concrete disposed of at BFI Fall River Massachusetts.

BACK-FILL AND COMPLETION

BACK-FILL AND COMPLETION

1,435 Tons of sand/gravel mix brought to the site, leveled and compacted.

Topsoil placed six inches thick across the site.

Material sampled prior to bringing to site.

Material originated at JAM Materials Middletown

1,435 Tons of sand/gravel mix brought to the site, leveled and compacted.

Topsoil placed six inches thick across the site.

Material sampled prior to bringing to site.

Material originated at JAM Materials Middletown

QUESTIONS

THANK YOU