Attachment_3_-_Assumptions.pdf

Attachment 3

ASSUMPTIONS

Site ID Site/Parameter Units Amount Comments

WAD 1 GENERAL CONDITIONS

Fixed Air Monitoring Locations each 6 Two personnel for real-time monitoring for Hex Chrome for two days days 4 Water truck usage days Amount to be developed by Contractor.

Water purchase for dust suppression and decontamination gallons Amount to be developed by Contractor.

WAD 3 Mobilization and Site Preparation Abandon monitoring wells each 5 clear 5' tall grass acre Amount to be developed by Contractor.

Clear small diameter trees each Amount to be developed by Contractor.

Manage excavated soil bcy Amount to be developed by Contractor.

Remove and manage ductile iron steam pipe ft 110

WAD 4 Soil Removal Remove and stockpile clean soil bcy 1,600 Includes 1.5:1 H:V sidewall slope Removal of contaminated soil bcy 1,700 Includes 1.5:1 H:V sidewall slope Surveys each 4

WAD 5 Contaminated Bedrock Removal Removal of bedrock in Area 5 bcy 1,300 Removal of bedrock in Area 4 bcy 100 Dewatering gallons Amount to be developed by Contractor.

Surveys each 2

WAD 6 Off-site Soil, Bedrock, and Water Disposal Off-site disposal of Hexavalent Chromium contaminated bedrock bcy Amount to be developed by Contractor.

Off-site disposal of Hexavalent Chromium contaminated soil bcy Amount to be developed by Contractor.

Water to be disposed offsite gallons Sizing of 1700 bcy bedrock to 1 foot lengths job

WAD 7 Environmental Soil Sampling and Analysis Hexavalent Chromium soil samples (24-hour turn around) each 31 Clean Fill Samples (standard turn around):

SW 846 Method 8270C TCL SVOCS each Amount to be developed by Contractor.

SW 846 Method 8260 TCL VOCs each Amount to be developed by Contractor.

SW 846 Method 8081A/8082 pesticides and PCBs each Amount to be developed by Contractor.

SW 846 Method 6010 B and 7000 series TAL metals each Amount to be developed by Contractor.

Waste Characterization Samples:

SW 846 Method 8270C TCLP SVOCS each 3 SW 846 Method 8260 TCLP VOCs each 3 SW 846 Method 8081/8151 TCLP PCBs, pesticides/herbicides each 3 SW 846 Method 6020/7470 series RCRA metals/mercury each 3

WAD 8 Long Term Monitoring for Groundwater for 8 Consecutive Quarters Ferrous iron by field test kit each 192 Hexavalent Chromium by Method 7199 each 192 Metals by 6010 (arsenic, cadmium, chromium, and lead) each 192 offisite disposal of 55-gallon drum each 8

WAD 9 Site Restoration and Demobilization Placement of topsoil bcy Amount to be developed by Contractor.

Placement of fill material bcy Amount to be developed by Contractor.

Compaction tests each 6 resedding acres Amount to be developed by Contractor.

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