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30 January 2015 <br /> AGE Project No. 14-3154 <br /> Page 8 of 9 <br /> removed below the stabilized soil cover) will be considered de minimus. Waste will <br /> stockpiled on plastic (10 mil) sheeting for evaluation and disposal at an appropriate <br /> landfill. If hazardous waste is encountered based on laboratory analysis, a profile for <br /> hazardous waste disposal will be prepared and the effected media will be transported to <br /> an appropriately permitted disposal facility. <br /> Soil samples will be field-screened using a Thermo 5806 organic vapor meter and RKI <br /> methane (four-gas) meter. The trenches excavated by the backhoe/excavator will be <br /> screened using a RKI methane (four gas) meter capable of measuring concentrations of <br /> methane, hydrogen sulfide, oxygen, lower explosive limit and potentially carbon <br /> monoxide. The trenches will be backfilled with native soil. <br /> All field procedures will be overseen by an AGE representative working under the <br /> supervision of a California Professional Geologist. Procedures for collection and <br /> analysis of soil samples, equipment decontamination and sample handling are <br /> presented below. Photographs will be taken at each sampling location and at <br /> surrounding areas. The photos will verify information entered in the field logbook. Each <br /> photo taken will be written in the logbook with the approximate time, date, and location. <br /> A trench log for the field work is included in Appendix C. <br /> 2.3. SOIL SAMPLING <br /> Soil samples will be collected from the soil column at the base of trenches which <br /> demonstrate waste in a proportion above a de minimus volume; soil sample collection <br /> will be determined based on the quantity of waste encountered in each trench. <br /> However, to fill any data gaps which were not fulfilled during the December 2014, soil <br /> sampling of soil will likely be required to ensure, reuse or backfill of the soil is <br /> practicable. <br /> Each soil sample will be collected with a metric soil sampling slide-hammer, loaded with <br /> a pre-cleaned steel sleeve. The ends of the sleeve will be sealed with a Teflon plastic <br /> and end caps taped over the ends of each sample sleeve. Samples are to be collected <br /> by an AGE representative. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice <br /> and transported under chain-of-custody procedure to a CDPH-certified laboratory. Each <br /> sample sleeve will be labeled with trench designation, depth, time, date and sampler's <br /> initials. Soils encountered in the trenches will be visually classified by AGE personnel in <br /> accordance with the Unified Soil Classification System (USCS). Additionally, soil <br /> samples will be field-screened for presence of volatile organic compounds using an <br /> organic vapor meter (OVM), equipped with photo-ionization detector (PID) pre- <br /> calibrated to isobutylene. <br /> Advanced GeoEnvironmental Inc. <br />