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

Table J-2
South Region High School #9 and Middle School #4 Operable Unit (OU) 1
Alternative 3 (Excavation, On-Site Stabilization, Off-Site Disposal)
Summary of Cost Estimate
(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) For costing purposes, it was assumed that the RCRA-hazardous waste would be stabilized to California-hazardous waste levels and
that California-hazardous waste would be stabilized to non-hazardous waste. This would be dependent upon the results of the
treatability testing
(8) Utility protection assumes only temporary "in-place" protection of underground utilities will be required, but does not include rerouting
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..
(9) Backfill costs include placement of approximately 800 cy of cement bentonite slurry at the base of the 30-foot deep excavation at
Parcel 39.
(10) 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.
(11) 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. Construction of
concrete pad includes cost for installation of underground water line and electrical conduit to pad.
J-5
363