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�,3A�-y <br /> � Contact Underground Service Alert (USA) a minimum of 48 hours prior to job site <br /> mobilization to advise subscribing utility companies of the soil excavation and <br /> sampling activities. Review project utility plans as provided by MTCo. <br /> b) Field Activities <br /> The following field activities will be performed during the sampling activities. <br /> Aerial Deposited Lead <br /> i Excavate 33 hand auger borings to a maximum depth of 2.� feet below ground <br /> surface within the proposed interchange modification areas. Soil samples collected <br /> from 0 to 0.� foot, 1 to 1.5 feet, and 2.0 to 2.5 feet below ground surface and will be <br /> submitted for laboratory analysis. <br /> > Transfer all samples to zip-lock plastic bags after collection. Label and transport <br /> sample ba�s to a Califomia-certified environmental laboratory, utilizing standard <br /> chain-of-custody procedures. Disposal of contaminated samples is not included in the <br /> base services proposed herein. <br /> � Provide quality assurance /quality control (QA/QC) procedures during the field <br /> activities. These procedures will include cleaning the sampling equipment between <br /> each soil boring by brushing the auger/sampler with a wire brush to remove all visible <br /> soil residuals or by washin� the equipment with a trisodium phosphate solution <br /> followed by a tap water rinse. <br /> � Backfill the borin�s to surface grade with the hand-auger cuttings. <br /> � Provide traffic control for shoulder closures as required by Caltrans (if necessary). <br /> Hazardous Waste Materials <br /> % Advance a total of eight (8) borings, four borings in the vicinity of the subterranean <br /> under crossing and four borings in the area of the proposed retaining wall near the <br /> Belmont Corporation Yard release site. The borings will be located within the <br /> existina or planned right-of-ways. A continuous soil core will be collected from each <br /> boring.�Soil samples will be selected for submission to the laboratory at approximate <br /> 3-foot intervals or at significant changes in lithology, within zones of apparent soil <br /> impacts based on field observations (odor, discoloration, and/or organic vapor <br /> analyze: readings). Selected portions of the continuous soil core will be field screened <br /> for volatile organic compounds using a photoionization detector (PID). The field <br /> geologist will choose two samples per bonng to be submitted for laboratory analysis <br /> based on observation and PID readin�s. The remaining soil samples select�.d for <br /> submission to the laboratory will be held by the laboratory pending analytical results <br /> of the analyzed soil samples. Each borin� will be advanced approximately 3-foot into <br /> the saturated zone. The saturated zone is expected to occur at 1 to 12 feet below <br /> City of Belmont — Route 101/Ralston Ave IC �tilodiftcattons 07/06/00 <br /> Proposal — PS&E <br /> 6 <br />