Chapter 1 - Caltrans - State of California

Chapter 3 Comments and Coordination
offramp and onramp near the preliminary location of soundwalls on January 10, 2008 and
January 11, 2008. The monitoring well depth was either 20 or 40 feet, depending on the
anticipated depth of dewatering. The drilling and installation of monitoring wells were
permitted by governing agency, Ventura County Water Resource Division or Santa
Barbara County Fire Prevention Division, and in accordance with the California
Department of Water Resources Bulletin 74-90 California Wells.
Environmental Consequences
There would be no direct impacts associated with hazardous wastes/materials under the
NO BUILD Alternative.
For BUILD Alternatives, the Department of Toxic Substances Control (DTSC) has
granted the Department’s District 7 (Los Angeles and Ventura Counties) a variance
allowing reuse of Aerially Deposited Lead (ADL) contaminated soils at the hazardous
concentrations within the project limit under certain conditions. Since this is a District 7
project, the variance might be applicable throughout. When hazardous ADL soils are
reused within the project limits, their locations and details should be shown on the design
and as-built plans.
From the southern project limits in Ventura County just west of Mobil Pier
Undercrossing (PM 39.8) to 500 feet north of Rincon Road in Santa Barbara County, the
soils in the median were determined to be non-hazardous (Type X). The excavation and
management of these soils is not regulated. These soils could be reused within the
project limit or relinquished to the contractor without any restrictions. In some of the
other areas depending on the excavation scheme, non-hazardous soils (TypeX) may be
encountered as described in the Hazardous Waste Assessment dated 3/25/08.
From 500 feet north of Rincon Road to 400 feet south of Palmetto Way in Santa Barbara
County the soils were found to be contaminated with Aerially Deposited Lead at
hazardous concentrations. These soils are regulated under the DTSC Variance and
Assembly Bill 414. The variance is invoked if these materials are encountered during
construction excavation. The hazardous soils should be placed more than five feet above
the highest groundwater level and covered with a minimum of one foot of clean soil (soft
cover). All surplus soil shall be treated as hazardous waste and be transported to and
disposed at a Class I facility per Title 22 of the California Code of Regulation (CCR).
From 400 feet south of Palmetto Way to the end of the project limits (0.44 miles south of
Casitas Pass Road in Santa Barbara County), the soils were found to be contaminated
with Aerially Deposited Lead to a higher level. These soils are regulated by the
IS/EA VEN-SB US101 HOV Project 137