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Leighton Consulting <br />I (A6) Environmental Services / <br />• Soil Gas Surveys: Leighton has completed numerous soil-gas Investigations to evaluate the <br />presence, concentration, and extent of volatile organic compounds and/or methane. This <br />technology has become increasingly important in recent years due to concerns over <br />potential vapor intrusion into above-ground structures and is often a critical component of <br />evaluating potential health risks. Our personnel are expert In the implementation of this <br />technology and in the evaluation of soil-gas data and will oversee the direct-push drilling <br />subcontractors (H & P Mobile Geochemistry, Jones Environmental, and Millennium <br />Environmental) in the completion of soil-gas investigations, when required. We regularly <br />work with all of our subcontractors to implement site-specific sample collection <br />methodologies which result in sound, defensible, soil-gas data that can be used in health <br />w, risk assessment models and remedial feasibility assessments. Leighton has also <br />?. developed a close working relationship with a Board-Certified Toxicologist (Dr. Heriberto <br />a? Robes with Enviro-Tox, Inc.) who provides health risk evaluations of potential exposure to <br />contaminants as a result of vapor intrusion. <br />ern <br />• Trenching, Trenching is a cost-effective assessment alternative that is often used to <br />characterize shallow soil and assess for the presence and level of contamination. <br />Trenching activities, in combination with hand-digging or air-knifing, can be useful in <br />exposing and/or removing subsurface structures such as tanks, pipes, clarifiers, and <br />sumps. Trenching activities will be supervised by Leighton personnel under our current <br />Cai/OSHA trenching permit. Leighton will first notify the City, and then accordingly notify <br />r the South Coast Air Quality Management District (AQMD) under our various locations Rule <br />1166 permit for soil excavation, If potentially contaminated soils are encountered during <br />excavations, <br />` Drilling. Drilling soil borings and/or installing groundwater monitoring wells may be <br />required under this contract and having worked in Santa Ana for almost 50 years, we have <br />extensive knowledge of the local geologic and hydrogeologic conditions which facilitates <br />the selection of the most appropriate drilling methods for each project. Leighton has <br />?s <br />worked with various drilling companies, including those chosen for this assignment, on <br />?s <br />CITY OF SANTA ANA I RIGHT OF WAY CONSULTING AND RELATED SERVICES ` <br />j 21 <br />Lv 25C-93