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! Project No. S8100-06-30 j July 25, 1995 Page 3 any public buried utilities. Site specific utility plans provided by Caltrans will be reviewed to attempt to locate private buried utilities in relation to proposed drilling locations. • A site specific Health and Safety,plan will be prepared to provide guidelines on the use of personal protective equipment (PPE) during the field activities. Soil Borings • Excavate three soil borings (SB4, SB-3 and SB-4) to a maximum depth of 25 feet bgs utilizing a truck mounted, hollow stem auger drill rig. Soil boring SB-2 will be drilled to a maximum depth of 45 feet bgs or a maximum of 15 feet below the groundwater surface, whichever is less. Excavate six additional borings (SB-5 through SB-10) if soil impacts are noted (based on field observations and organic vapor analyzer (OVA) screening) in borings SB-1 through SB-4. The,approximate boring locations are depicted on the Site Plan, Figure 2. 1 • Collect soil samples at approximate five foot intervals from within each boring. The soil samples will be obtained utilizing a modified "California" sampler equipped with 6-inch long stainless steel sample tubes to facilitate sample handling and storage. = Following sample collection,"the tubes will be capped, labeled, chilled, and transported to Sparger Technology, a California-certified environmental laboratory utilizing standard chain-of- custody procedures. • Submit selected soil samples for the analyses of TPHg and TPHd following EPA Test Method 8015 modified-,and BTEX following EPA Test Method 8020. • Perform headspace surveys on the soil samples collected using a portable organic vapor analyzer (OVA), equipped with a photo ionization detector (PID) or flame ionization detector (FID). Headspace readings represent qualitative indicators of the presence of organic vapors in the pore space of the soil samples collected. The headspace readings will be recorded on the boring logs submitted with the final report. • Onsite soil generated during the boring activities will be collected in 55-gallon drums and stored onsite for disposal following regulatory protocol. • Provide quality control/quality assurance (QA/QC) procedures during the field activities. These procedures will include cleansing/rinsing of the sampling equipment prior to each ' sampling effort, the cleansing/rinsing of the drill rig augers prior to and between borings and providing chain-of-custody documentation for each sample collected and transferred to the laboratory for analytical testing. • All drilling, sampling, and related activities will be conducted under the supervision of a Certified Engineering Geologist, a Registered Geologist, or a Professional Engineer, who