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27 October 2017 AdvancedGeo AGE Project No. 14-3154 ErlvironmentaI Page 3 of 4 Building Footprint -East Portion of Parcel AGE proposes excavating trenches to collect samples in the eastern part of the parcel, in the footprint of the proposed building. A large portion of the eastern part of the parcel has yet to be investigated. AGE anticipates that approximately 14 additional trenching locations, excavated to approximately 12 feet bsg will be adequate to evaluate the potential lateral extent of waste within the fallow non -irrigated grass area east of the covered waste handling area (Figure 2). Trenches in the proposed building foot print will include soil sampling at depths determined in the field or at waste burial depth (4-5 feet) or the section which will be excavated and graded to allow for construction of buried utilities. All trenches may be advanced deeper if significant is waste encountered and the vertical extent of waste requires verification. Native materials and minor waste will be backfilled in the reverse order of excavation; native soil will be used to backfill and secure the upper sections of the excavations. Waste and native soil collected will be analyzed by a California Department of Public Health (CDPH)-certified laboratory for the following constituents: • Dioxin and Furan by EPA Method E1613 and SW8290. Volatile organic compounds (VOCs), including chlorinated VOCs and "BTEX" compounds and fuel additives/fuel oxygenates (methyl tertiary butyl ether [MTBE], tertiary butyl alcohol [TBA], di -isopropyl ether [DIPE], ethyl tertiary butyl ether [ETRE], tertiary amyl methyl ether [TAME] and lead scavengers 1,2- dichloroethane [1,2 -DCA] and 1,2-dibromomethane [EDB]) in accordance with EPA Method 826013; • Polynuclear aromatic hydrocarbons (PNAs) or polycyclic aromatic hydrocarbons (PAHs) and semi -volatile organic compounds (SVOCs) in accordance with EPA Method 8270; Polychlorinated bi-phenols (PCBs) in accordance with EPA Method 8082. CAM 17 Metals Total Threshold Limit Concentration (minimally: lead, cadmium, chromium, nickel and zinc) by EPA Method 601013/6020/207/208. Soluble Threshold Limit Concentration (STLC) may additionally be analyzed for metals. Laboratory reports for soil analysis, testing methods and laboratory quality assurance/quality control (QA/QC), and sample chain of custody documentation will be presented in an updated Site Assessment Report with findings and Conceptual Site Model. All field procedures will be overseen by an AGE representative under the supervision of a California Professional Geologist. Fieldwork will be conducted under San Joaquin County Environmental Health Department oversight.