Laserfiche WebLink
1 INC <br /> analysis of suspected constituents of concern according to the Tri-Regional Board <br /> ' Guidelines Other test methods may be designated by PHSEHD, such as MTBE, as <br /> appropriate These analyses will be performed by a California state certified analytical <br /> ' laboratory <br /> TASK 2. VADOSE ZONE SITE ASSESSMENT AND INTERIM REMEDIAL ACTION <br /> 1 <br /> Task 2 is designed to complete a vadose zone site assessment and interim remedial action <br /> ' at the site The hydrocarbon contamination will be characterized and the vertical and <br /> horizontal extent will be mapped jointly by overexcavation of the core area of the <br /> ' contaminated soil and if necessary, by additional soil borings The decision to utilize either <br /> additional soil borings or exploratory excavation will be made after the highly contaminated <br /> ' soil immediately below and adjacent to the former location of Tank 1 has been removed <br /> Task 2 1 Exploratory Excavation <br /> ' The objective of removing the highly contaminated portion of the hydrocarbon contaminated <br /> soil is to (1) remove entirely or at least the vast majority of the soil volume that is the source <br /> of potential groundwater contamination, and (2) complete necessary soil remediation to <br /> ' extent that is practical and economic prior to the property being redeveloped and a building <br /> potentially placed over the former UST site <br /> ' It is anticipated that approximately 2 200 to 3 <br /> p pP y ,000 cubic yards of clean and hydrocarbon <br /> ' contaminated soil will be removed from the subsurface from the excavation An estimated <br /> 1,500 cubic yards of hydrocarbon contaminated soil will be removed immediately under and <br /> ' adjacent to the former UST The volume of hydrocarbon contaminated soil that will be <br /> removed from the excavation may be greater and will depend on the location and <br /> ' concentrations of hydrocarbon contaminated soil encountered <br /> ' 08220010 005 g <br /> _1 <br />