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KLE/NFELOER \` F.iplu veopk FµInblWe.v. At this time Kleinfelder proposes to drill no deeper than 120 feet in each location. We have not been provided with on-site groundwater data at this time, thus only a preliminary estimate of effort can be provided at this time. However, Kleinfelder reviewed well drillers logs for the area which indicated wells are approximately 200- 300+ feet deep and draw water from approximately 215-317 feet bgs. First encountered groundwater is anticipated to be approximately 100 feet bgs based on our experience in the area which includes a monitoring well drilled west of the site to a depth of approximately 130 feet. Perched zones of water may be encountered prior to encountering first groundwater, but will be penetrated to the targeted depth for groundwater sample collection. During the advancement of the borings, soil samples will be collected at five-foot intervals using standard drive samplers and 6-inch long brass tubes. When drilling nears the anticipated groundwater depth, the SimulProbe sampler will be used for sample collection. The retrieved samples will be observed for lithologic classification and qualitative field screening. Lithologic classification will be based on the Unified Soil Classification System (USCS). The soil in the boreholes will be qualitatively screened in the field using a photo-ionization detector (PID) for the presence of volatile organic constituents. PID readings will be recorded on a field data sheet. An experienced environmental engineer or geologist will log the soil borings. All equipment used in the drilling procedures will be cleaned and/or decontaminated by steam cleaning between borings. After collection of the grab groundwater sample, the boirng will be left open up to about one hour to allow for the groundwater elevation to stabilize. The depth to water will be measured with a conductivity based water level indicator from ground surface. IDW The investigative derived wastes (IDW), which includes soil cuttings and wastewater generated during drilling, equipment decontamination, and well development and sampling water, will be contained in labeled DOT approved drums. The drums will be labeled and temporarily stored on-site pending analytical results in an area designated by the City of Tracy. The drums will be stored until analytical results are made available to determine whether special handling is required. In accordance with the RWQCB request, the IDW sample results will be presented to the RWQCB staff prior to its disposal. If the sample analytical results indicate the waste is not characterized as a 128328/SAC14R0267 Page 6 of 11 July 12, 2013 Copyright 2013 Kleinfelder Revision 2-February 14,2014