ARCHIVED REPORTS_2015 SITE INVESTIGATION WORK PLAN

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' A 30 January 2015 AGE Project No. 14-3154 Page 8 of 9 Soil samples will be field-screened using a Thermo 580B organic vapor meter and RKI methane (four-gas) meter. The trenches excavated by the backhoe will be screened using a RKI methane (four gas) meter capable of measuring concentrations of methane, hydrogen sulfide, oxygen, lower explosive limit and potentially carbon monoxide. The trenches will be backfilled with native soil. All field procedures will be overseen by an AGE representative working under the supervision of a California Professional Geologist. Procedures for collection and analysis of soil samples, equipment decontamination and sample handling are presented below. Photographs will be taken at each sampling location and at surrounding areas. The photos will verify information entered in the field logbook. Each photo taken will be written in the logbook with the approximate time, date, and location. A trench log for the field work is included in Appendix C. 2.3. SOIL SAMPLING Soil samples will be collected from the soil column at the base of trenches which demonstrate waste in a proportion above a de minimus volume; soil sample collection will be determined based on the quantity of waste encountered in each trench. However, to fill any data gaps which were not fulfilled during the December 2014, soil sampling of soil will likely be required to ensure, reuse or backfill of the soil is practicable. Each soil sample will be collected with a metric soil sampling slide-hammer, loaded with a pre-cleaned steel sleeve. The ends of the sleeve will be sealed with a Teflon plastic and end caps taped over the ends of each sample sleeve. Samples are to be collected by an AGE representative. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-custody procedure to a CDPH-certified laboratory. Each sample sleeve will be labeled with trench designation, depth, time, date and sampler's initials. Soils encountered in the trenches will be visually classified by AGE personnel in accordance with the Unified Soil Classification System (USCS). Additionally, soil samples will be field-screened for presence of volatile organic compounds using an organic vapor meter (OVM), equipped with photo-ionization detector (PID) pre- calibrated to isobutylene. 2.4. LABORATORY ANALYSIS Selected soil samples will be analyzed by a CDPH-certified laboratory; the following constituents may be selectively analyzed based on field monitoring: Advanced GeoEnvironmental Inc.