LEIGHTON CONSULTING, INC 3 - 2006

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Statement of Qualifications for Environmental Consulting Services City of Santa Ana Public Works Agency (ASTM) Standard Standard Practice for Environmental Site Assessments: Phase I Environmental Process E1527-05. Phase 11 - Site Investigations A Phase II is different from a Phase I ESA in that it involves the collection of samples of air, soil, surface water, groundwater, and other materials may be collected for analysis to identify and/or confirm the presence or absence of chemicals that can cause adverse environmental impact. The key to an effective and accurate Phase II ESA investigation is the collection of representative samples and the preparation of defensible conclusions by experienced professional and technical staff. A Phase 11 ESA is typically undertaken if the outcome of a Phase I ESA determined there is a potential environmental risk on a property, or if a spill or release is known or suspected. After a kick-off meeting with the City to define your objectives, a technical workplan will be prepared and submitted to the appropriate regulatory agencies for approval. Prior to the commencement of field activities, Leighton will prepare a Site Specific Health and Safety Plan (HSP) for the Limited Phase II ESA fieldwork. The HSP will include safety aspects of the work to be performed at the site. In addition, Leighton will contact Underground Service Alert (USA) to designate underground utility locations. Each proposed boring location will be clearly marked in white paint by Leighton prior to contacting USA. Soil Sampling Soil sampling will be conducted in accordance with federal, state, and local guidelines with the objective of obtaining representative samples of the subsurface materials. Sample intervals will be proposed in the work plan based on site specific conditions, and will be subject to regulatory agency review and approval. Soil samples are generally collected using either a hand auger, a direct -push drilling rig, or a hollow -stem auger drilling rig. • Hollow -Stem Auger — A hollow -stem auger drill rig cores an auger into the ground through which samples are collected. Soil samples are obtained using a split -spoon sampler. • Direct -Push Rig — The drive rod is continuously pushed from the surface to the bottom of the boreholes. Soil samples are collected from the drive rod sampler at any depth as required. No waste is generated using this method. • Hand Auger — A hand auger is a hand-held device that is advanced manually into the subsurface. Soil samples can be collected using a manually driven split spoon sampler or soil can be removed from the cup and placed in glass jars. All Methods Leighton Consulting, Inc. Page 4