04 ATTACHMENT 6 - Laserfiche WebLink

Project No. E9164-04-0 2 - 8 - April 15, 2020 6.3 Soil and Excavation Characteristics 6.3.1 The onsite soils can generally be excavated with moderate to heavy effort using conventional excavation equipment. We do not anticipate excavations in the alluvial soils at the site will generate oversize material (greater than 6 inches in nominal dimension). However, unknown or unanticipated constituents may exist, especially within areas of artificial fill. 6.3.2 It is the responsibility of the contractor to ensure that all excavations and trenches are properly shored and maintained in accordance with applicable Occupational Safety and Health Administration (OSHA) rules and regulations to maintain safety and maintain the stability of adjacent existing improvements. 6.3.3 The materials encountered at the site are not considered “expansive” as defined (Expansion Index of 20 or higher). The recommendations of this report assume proposed foundation systems will derive support in properly compacted fills and/or competent native soils. Our laboratory test results indicate very low expansion potential for the alluvial clays at the site. 6.4 Materials for Fill 6.4.1 On site soils are suitable for use as engineered fill in structural areas provided they do not contain deleterious matter, organic material, or cementations larger than 6 inches in maximum dimension. Excavated soils may be wet and require drying prior to use and engineered fill. 6.4.2 Import fill material should be primarily granular with a “very low” expansion potential (Expansion Index less than 20), a Plasticity Index less than 15, be free of organic material and construction debris, and not contain rock larger than 6 inches in greatest dimension. 6.4.3 Environmental characteristics and corrosion potential of import soil materials may also be considered. Proposed import materials should be sampled, tested, and approved by Geocon prior to its transportation to the site. 6.5 Grading 6.5.1 All clearing operations and earthwork (including over-excavation, scarification, and recompaction) should be observed and all fills tested for recommended compaction and moisture content by representatives of Geocon. 6.5.2 Structural areas should be considered as areas extending a minimum of 5 feet horizontally from a foundation or beyond the outside dimensions of buildings, including footings and overhangs carrying structural loads, and where not restricted by property boundaries. 6.5.3 A preconstruction conference should be held at the site prior to the beginning of grading operations with the owner, contractor, civil engineer and geotechnical engineer in attendance. Special soil handling requirements can be discussed at that time. 6.5.4 The site should be stripped of all surface vegetation from the area to be developed/graded. All active or inactive utilities within the construction area should be protected, relocated, or abandoned. Any pipelines to be abandoned that are greater than 2 inches and less than 18 inches in diameter should be removed or filled with sand-cement slurry. Utilities larger than 18 inches in diameter should be removed. Excavations or depressions resulting from demolition and site clearing operations, or other