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Qualifications to Provide Environmental Services- Housing Division and historic resources, industrial hygiene, health and safety, ecological resources, endangered species, indoor air quality, or high voltage power lines, Our Phase I ESAs will be performed under the direction of a California Professional Geologist and Environmental Professional. Phase is include the following tasks; Records Review, Site Reconnaissance, Interviews, and Report. Phase ft Environmental Site Assessments If subsurface Investigation or remedlation is recommended in the Phase I ESA, the project may proceed to a Phase II ESA. The objective of a Phase II Environmental Site Assessment is to determine the lateral and vertical extent of contaminants in the subsurface. This task generally Includes the collection and analysis of soil or groundwater samples, or both. The samples are collected with appropriate sampling equipment- a hand auger for shallow samples, a direct push Geoprobe rig for sampling to about 50 feet in depth, or a hollow stem auger drilling rig for deeper sampling and to Install groundwater monitoring wells. Soli borings are drilled in this task and groundwater monitoring wells are installed and sampled under this task. The sampling data are used to prepare site assessment reports. The assessment reports are used to determine if site cleanup is necessary. The reports are typically sent to oversight agencies, such as the Regional Water Quality Control Board for their review, Depending on the complexities of the site, several stages of investigation may be necessary. For example, the project may require one or more of the following; • A geophysical/ground penetrating radar survey to evaluate the site for the presence of underground piping/tanks • Trenching or excavation • Soil borings, soil vapor probe installation/survey • Groundwater well installation or abandonment • Drilling with a Geoprobe rig or hollow stem auger drilling rig • Soil and groundwater sampling • Preparation of vapor -phase migration and risk assessments n Analysis of soil and groundwater samples for various contaminants • Asbestos and lead-based paint surveys, including destructive testing and analyses Asbestos and Lead Based Paint Surveys Asbestos Survey For this component of the work program, Rincon would utilize either VM3 Environmental or Ambient Environmental to conduct asbestos surveys using EPA accredited Asbestos Hazard Emergency Response Act personnel. A visual survey Is conducted initially to identify the presence of suspect asbestos containing material, Homogenous areas are defined as areas in which suspect materials are uniform in texture, construction or application date, and general appearance. Data are presented by homogenous area according to location as well as material type, quantity, and the presence of asbestos. Samples are collected in general accordance with EPA sampling procedures as defined in the Simplified Sampling Scheme for Friable Surfacing Materials, USEPA, 1985 and the Asbestos Hazard Emergency Response Act of 1986 (40 CFR part 763). Reasonable care is taken to avoid any accidental fiber release Into the building environment. The asbestos samples would be analyzed using a laboratory accredited by the American Industrial Hygiene Association, the National Institute for Standards and Testing and the National Voluntary Laboratory Accreditation Program. Analysis is by Polarized Light Microscopy. Quality Control is strictly enforced to assure accuracy of sample results. Current Federal USEPA Regulations define a material to be asbestos -containing at 1% by weight. Current State of California regulations define a material to be asbestos -containing at 0.1% by weight. For this reason, any sample reported as containing trace amount of asbestos is assumed to contain asbestos. The analytical data are presented in a report describing sampling and analytical methods used, quantities of hazardous materials, and material -specific recommendations. Lead Based Paint Survey Rincon would utilize the services of either VM3 Environmental or Ambient Environmental to conduct lead based paint surveys. The lead based paint survey would be conducted by a State of California Department of Health Services trained Page 4 25A-19