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MainPlace Mall Transformation Project 12126.001 <br />Expansion Index (EI) testing of two samples from the upper 4 to 7 feet bgs at the <br />site performed by others (ISE, 1985a; see Appendix C) indicated that the site <br />soils have El values ranging from 11 to 14. Our test results suggested that the <br />near -surface site soils exhibit low expansion potential (i.e, EI=24 and EI=27 but <br />greater than 20). However, clayey soils exist at the site and could be expansive <br />when subject to change in moisture. <br />Design Consideration: Implementation of standard engineering and <br />earthwork construction practices, such as proper foundation design and <br />proper moisture conditioning of earthen fills will reduce the impacts <br />associated with expansive soils to tolerable levels. Site -specific tests should <br />be performed with respect to the proposed development at each parcel to <br />confirm the previous findings. <br />3.12 Erosion <br />The erosion characteristics of the unconsolidated alluvial deposits exposed on <br />any future potential temporary cut slopes onsite is expected to be moderately <br />susceptible to erosion. Although not currently anticipated, any manufactured <br />slopes composed of compacted fill would be expected to be moderately <br />susceptible to erosion. <br />The native soils onsite, as well as fill slopes constructed with native soils, will <br />have a moderate susceptibility to erosion. These materials will be particularly <br />prone to erosion during excavation and site development, especially during <br />heavy rains. <br />Design Consideration: The impact of erosion can be reduced through the <br />application of Best Management Practices (BMPs) and other Storm Water <br />Pollution Prevention Plan (SWPPPs), such as temporary catchment basins <br />and/or sandbagging to control runoff and contain sediment transport within <br />the project site during construction. Following completion of the project, the <br />site will be improved with structures, hardscape, landscaping and appropriate <br />drainage infrastructure. <br />3.13 Methane <br />Based on review of the Division of Oil, Gas & Geothermal Resources (DOGGR) <br />online Well Finder maps, there no documented oil wells located within or in the <br />vicinity of the project site. The nearest oil field to the site is the Olive Oil Field, <br />12 9 <br />Leighton <br />