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21 July 1999 AGE-NC Project No. 99-0604 Page 2 of 6 2.1. PERMITTING AND PRE-FIELD WORK ACTfVITIES Applicable site assessment permits will be obtained from the San Joaquin County PHS-EHD;a site- specific health and safety plan is presently on file with the PHS-EHD and will be revised for the CAM 17 metals detected in previous ground water samples. Prior to mobilization, each boring location will be clearly marked and a utility clearance obtained through Underground Service Alert. 2.2. SOIL SAMPLE COLLECTION AND ANALYSIS During this investigation,AGE proposes to advance one boring at the site to evaluate"background" concentrations of target analytes. The proposed soil boring location is illustrated in Figure 2. Based upon a review of data collected during the monitoring well installation, we recommend advancement and sampling of one boring approximately 300 feet northeast of the former injection wells site.AGE anticipates advancement of the boring to a depth of approximately 60 feet.However, total depth of the soil boring will be based on field observations and field screening using an organic vapor monitor(OVM). Soil samples will be collected from each boring at five-foot intervals to total depth. Field procedures for advancement of borings and collection of soil samples are presented in Section 3.1. Selected soil samples will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory for the following constituents: • TPH-d (diesel) and TPH-mo (motor oil) in accordance with EPA Method 8015 Modified; • Benzene, toluene, ethylbenzene and xylenes in accordance with EPA Method 8020; and • Selected CAM 17 metals(cadmium,chromium, lead,nickel and copper)in accordance with appropriate EPA 6010 and 7000 series. 2.3. 1N-SITU GROUND WATER SAMPLE COLLECTION AND ANALYSIS During the soil assessment activities,depth-discrete groundwater samples will be collected from the soil boring, if possible. In-situ ground water sample collection procedures are presented in Section 3.2. Selected ground water samples will be analyzed by a DHS-certified laboratory for the following constituents: Rdvaneed GeoEnviron mental,Inc.