Site-Specific Health and Safety Plan (HASP) - Laschools.org

Table J-1
South Region High School #9 and Middle School #4 Operable Unite (OU) 1
Alternative 2 (Excavation and Off-Site Disposal)
Summary of Cost Estimate
CLEANUP - Operable Unit 1 (North of Tweedy Blvd) Quantity (1)
Geotechnical Engineering Consultant
Units Cost per Unit Total Cost
Review of Test Results and Plans 80 hours $ 120 $ 9,600
Field Oversight 160 hours $ 120 $ 19,200
Compaction Testing
Backfill & Compaction
1 LS $ 25,000 $ 25,000
Field Oversight 1 LS $ 25,000 $ 25,000
Import Soil (LAUSD, DTSC Specifications) (8) 47,610 ton $ 23 $ 1,095,030
Soil Import Geotechnical / Chemical Analysis 20 1/2000 CY $ 1,000 $ 19,838
Parcel 38 Backfill with gravel up to 18 ft bgs (9) 1,500 CY $ 50 $ 75,000
Backfill & Compaction (import soil and sloped/non-impact soil) 59,260 ton $ 15 $ 888,900
Contingency Measures
Field Labor and Oversight (all contingency measures) 440 hours $ 120 $ 52,800
Vapor Monitoring Wells (7 sets of multiple screened wells) 420 linear ft $ 100 $ 42,000
Groundwater Monitoring Wells (2 "A"-zone wells) 90 linear ft $ 100 $ 9,000
Impermeable Vertical Vapor Membrane (materials & application) 9,000 sq. ft $ 5 $ 45,000
Installation of SVE Piping (10)
350 linear ft $ 75 $ 26,250
Construction of Treatment Pad, including Utilities (10)
1 LS $ 20,000 $ 20,000
Site Restoration
Interim Cover - Hydroseed 1 LS $ 200,000 $ 200,000
Regrade Site 11,095 SY $ 3 $ 29,586
Demobilization 1 LS $ 25,000 $ 25,000
Closure Report (includes compaction report) 1 LS $ 150,000 $ 150,000
GENERAL CLEANUP - Operable Unit 1 (North of Tweedy Blvd) $ 9,088,364
General Conditions
Project Management/Construction Administration/Technical Eval. 15 % $ 1,363,255
Escalation 5 % $ 454,418
Contingency 15 % $ 1,363,255
Markup Total $ 3,180,927
TOTAL GENERAL CLEANUP COSTS POST MARKUP $ 12,269,292
Notes:
(1) Estimated quantities (i.e., number of units) used are based on the current understanding of site condition; during implementation of the remedy,
actual ( ) quantities p may vary due to the field conditions or logistical gconsiderations encountered during remediation. p ( g ) p p
6 feet apart (not 6 feet on-center), and wood lagging will be installed on soldier piles to a depth of 30 feet along a 120 ft section. Steel beams will be
left in place after the excavation ("sacrificed"). For excavation to 30 ft bgs (below "A1" zone groundwater occurring at ~19 ft bgs) at Parcel 38,
dewatering will be required. For cost estimating, it is a assumed dewatering will involve pumping, containment, and disposal of 11,000 gallons of
"A1" zone groundwater.
(3) Soldier piles will be as described above (30-inch dia boreholes at 6 ft spacing, with steel I-beams to 65 ft bgs, and lagging to 30 ft bgs), except
that the steel I-beams will be removed from the 30-ich dia boreholes (steel will be re-used), and lagging will be installed along a 300 ft section.
(4) Trench box shoring will be installed to allow excavation to 10 ft bgs along a 100 ft section of the property.
(5) Trench box shoring will be installed to allow excavation to 10 ft bgs along a 100 feet section of the property.
(6) Non-impacted soil excavated during the remedial action, including soil excavated to allow sloping back of the excavation, will be used as backfill
to restore the site to final grade.
(7) Utility protection assumes only temporary "in-place" protection of underground utilities will be required, but does not include re-routing of
underground utilities. Utility protection in Adella Avenue includes an active gas line within the excavation footprint and, therefore, this utility protection
has a highest associated cost.
(8) Backfill costs include placement of approximately 800 cy of cement bentonite slurry at the base of the 30-foot deep excavation at Parcel 39.
(9) Due to the complications of backfilling between 30 and 18 ft bgs (i.e., below the "A1" groundwater), it is assumed gravel will be used as backfill
from the excavation bottom (30 ft bgs) to 18 ft bgs.
(10) Under Installation of SVE Piping" and "Construction of Treatment Pad", does not include capital costs for purchase of treatment systems (other
than installation of piping runs) or costs for operation and maintenance of SVE treatment system.
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