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K E I N F E L D E R • All excavations must comply with api3hcable local state, and federal safety re¢ulations Including the current Cal OSHA Excavation and Trench Safety Standards Construction site safetv generally is the sole responsibility of the Contractor who shall also be, solely responsible for the means, methods, and sequencing of construction operations We are providing the information below solely as a service to our client Under no circumstances should the information provided be interpreted to mean that Kleinfelder is assuming responsibility for construction site safety or the Contractor's activities Such responsibility is not beim implied and should not be inferred " Sloped Excavations In our professional opinion, a majority of the clays and silts encountered along the proposed pipeline alignments and jacking pit locations can be excavated at or near vertical for a short time These soils, however, can and will progressively slough or cave if not sloped or if left unshored during pipe placement and backfilling The loose to medium-dense sand strata encountered are essentially cohesionless with very little silt and clay "binder " Accordingly, these soils are susceptible to caving, loss of ground, and undercutting of overlying soils during or soon after excavation The following table provides maximum temporary slope inclinations for the various soil conditions encountered at the site Maximum slope inclinations used in construction should be based on the weakest soil layer encountered Maximum Slope Inclination (Horizontal to Vertical) for Excavation Soil T e De the of 20 feet or less Stiff Clay or,Silt Very-Stiff to hard Clay or Silt 314 1 All "Clean" Sand 1 112 1 Loose to Medium-Dense Siltv Sand 1 112 1 Dense Silty Sand 1 1 The above table was developed under the assumption that temporary excavations will be properly dewatered during construction will not be left open or exposed for a period greater than five days, and will not be exposed to direct rainfall, runoff, or surcharge loading Heavy equipment, construction materials excavated soil and vehicular traffic should not be allowed within 113 the slope height from the top of any excavation During wet weather, earthen berms or other methods should be used to prevent runoff water from entering all excavations All runoff water should be collected and disposed of outside the construction limits • 1=639 GOi12002R369 1iml 19 2002 'J 3002 Kleinfelder Inc Page _of 16 I