EXH1285051217

3.2 Comparison to Regional Arsenic Soil Concentrations 5 3.3 Arsenic Mobility is Limited 6 3.4 Ecology's ASARCO Plume Investigation Status 7 4.0 TOPSOIL MANAGEMENT STRATEGY 8 4.1 Clearing and Grubbing B 4.2 Topsoil Removal 9 i 4.3 Stockpiling 9 _.J 4.4 Topsoil Replacement during Reclamation 1o 5.0 HEALTH AND SAFETY 11 6.0 RECOMMENDATIONS FOR CONTRACT SPECIFICATIONS 11 7.0 REFERENCES 12 TABLE Arsenic Concentrations in Borrow Area 4 Soils FIGURES Site Location Map Borrow Area 4 Topsoil Sample Location Map HartCrowser Page i 4978-54 September21, 2001 - AR 051218 TOPSOIL MANAGEMENT PLAN BORROW AREA 4 SEA-TAC INTERNATIONAL AIRPORT CITY OF SEATAC, WASHINGTON EXECUTIVE SUMMARY The Port of Seattle (Port) has identified Borrow Area 4 as a source of earth fill material for the third runway embankment construction project at the Seattle- Tacoma International Airport (STIA). Borrow material excavation is planned to occur in 2002. Site reclamation would begin during the'same year. Topsoil materials will be removed from the borrow area for temporary stockpiling and ": subsequent replacement as a planting medium during reclamation of the borrow area. None of the topsoil will be used as fill material for the third runway embankment. Borrow Area 4 lies,within part of the Puget Sound region impacted by fallout of arsenic-bearing airborne emissions. The fallout originated from historical ASARCO copper smelter operations in Tacoma. Chemical testing of topsoil from Borrow Area 4 detected mean arsenic concentrations comparable to those commonly present in undisturbed surficial soils elsewhere within the footprint of the smelter plume. Maximum arsenic…

Open full document

Upcoming Events

PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]