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Lodi City Landfill November 16,2011 North of Awani Drive,Lodi,California Project No. 104690061 11.5. Exploratory Trenches-Sampling Typically, two to four samples will be collected per trench; the actual number of samples will depend on the depth of the trench and subsurface materials encountered.At each trench location, prior to excavation,one sample will be collected just below the surface.One to two samples will be collected from the wastes, and if they are relatively thick and/or highly variable, additional samples will be collected.A sample will also be collected in the underlying formation, directly beneath the waste materials within the trench, unless it is not possible to access. Sample depths and locations will be based on visual observations of subsurface materials. Samples of wastes will be collected, as possible unless the materials are not conducive to sampling (e.g., solid wastes, etc.) in which case, samples of interlayered soils, if present be- tween wastes will be collected. If wastes are not observed in the trench excavation, a surface sample and an additional sample at depth will be collected for possible analytical testing. Two background samples will be collected and analyzed to establish background metal con- centrations.No other field quality control is anticipated to be required. Only discrete samples will be collected from the surface, the exploratory trench excavations, and as background samples.As applicable, field staff will utilize authoritative sampling pro- tocol to determine sample locations. The surface and background samples will be collected by coring the laboratory supplied jar directly into the surface. Subsequent representative samples of wastes and/or underlying al- luvium will be collected directly from the trench excavations, if sufficiently shallow; from the excavator bucket; or, from the spoils pile. The samples will be collected by coring the laboratory-supplied glass jars directly into the relatively intact soil mass. Sample depths and locations will be selected based on the field observations and instrument screening of sub- surface materials encountered and sample locations will be measured and recorded on individual trench logs. Although wastes may have been burned or partially burned, trench spoils and samples will be screened for VOCs using a photoionization detector(PID) and for potential gases using a four-gas meter. • 104690061R6nal.dm 30 N/)7Ya*QUr%