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2441 W,Charter Way ® Page 5 Work Plan—Soil Boring Installation GPE Project No.667.2 June 21,2013 Since the Geo-Probe is a direct-push system, no soil cuttings or any solid waste will be generated. During drilling, a detailed log will be made of the borings (See next sub-section for details). During drilling, a portable methane detector and a PID organic vapor meter and a methane gas detector will be used to determine if elevated concentration of these gases are present. The presence of any volatile vapors or methane will be noted on the boring logs and noted in the final report. 2.2 Sampling and Analyses During drilling, a boring log will be made for each boring. The information to be noted includes such data as sample depths, horizons of detectable contamination (detected by field methods), soil classification utilizing the Unified Soil Classification System and sediment description (color, texture, composition, hardness, moisture content, and post- depositional changes that have occurred in the natural sediments). Note will also be made of the type and character of fill material. A trained and experienced geologist should have little difficulty distinguishing landfill material from the underlying native sediments. Landfill material will include numerous items, particles, fragments, and ash that clearly are not native sediments. Grain size, coloration, and sorting should make the boundary of landfill and native soil clear even in the unlikely event that even more obvious material such as man-made trash and debris is not found. Since the soil boring cores will be retained, it will be possible to slice open and photograph the pertinent core sections in the more controlled environment of the Geo-Phase sample preparation area. Photos of the contacts will be included in the final report. While drilling, each boring will be continuously cored in 4-foot long sections. Soil samples will be screened using field methods by observing discoloration, odor, sediment size and sorting as well as evidence of man-made items or fragments. These observations will be made by the eye of a trained, experience and licensed professional geologist. In addition, methane and PID detectors will be used to help detect material evolving potentially volatile chemicals. Using these criteria and the additional factors of boring location and sample depth, soil samples from selected borings will be submitted for laboratory analysis. The samples will be selected to represent a cross-section of the various types of fill that may be encountered. This decision will be made in the field. It is expected that from 6 to 10 soil samples will be selected for laboratory analysis. Soil samples are collected using a 4-foot long drive sampler lined with a plastic sample sleeve. Upon retrieval, soil samples at 4-foot intervals will be logged and sample material retained for possible laboratory analysis will be sealed with plastic end caps fitted over the sample sleeve for temporary retention in the event that later laboratory 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295