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RFP #21-017: On -Call Environmental Review Services for the CHAMBERS Housing Division GROUP City of Santa Ana Community Development Agency Phase II investigations may include the following: a Geophysical Survey, collection and testing of soil, soil vapor, indoor air, and/or groundwater samples, field screening of samples, and/or laboratory analysis of samples. Converse will generally follow the standard practices of the ASTM Standard Practice for Environmental Site Assessments: Phase II Environmental Site Assessment Process (ASTM E1903-19). If a Soil Gas Survey is to be completed, it will be in general accordance with the Advisory -Active Soil Gas Investigations by the California Department of Toxic Substances Control and California RWQCB, dated July 2015. Lead and Asbestos Testing, Monitoring and Clearance (Converse) Asbestos Survey The Asbestos Survey will be limited to the predominant style of accessible materials that are present at the building. Non-destructive sampling methods will be utilized. 1. Visual survey of the structure on -site for suspect asbestos -containing materials and homogeneous areas (areas that have uniform color, texture, and appearance). If construction plans and/or specifications are available, Converse can review these items to help in the identification of potential asbestos -containing materials (ACMs). Suspect materials will be divided into friable and non -friable materials. The homogenous materials will be placed in one of the following Environmental Protection Agency (EPA) categories: • Surfacing Materials (sprayed or troweled -on materials) • Thermal Systems Insulations (materials generally applied to various mechanical systems) • Miscellaneous Materials (any materials which do not fit in the above categories) Accessible interior and exterior areas will be sampled for the presence of asbestos. Destructive sampling will not be performed. Samples of general building components (i.e., visually identical flooring material and ceiling tiles) will be assumed to be representative of materials used throughout the building. Converse will not make a second effort to survey building, or portions of building, not accessible during the field reconnaissance. No destructive sampling methods will be employed during this survey. Therefore, void spaces between walls, floors, ceiling or below soil level will not be observed or sampled. 2. Collect samples of suspect ACMs in representative homogenous areas determined by visual examination and review of plans. Up to 80 bulk samples will be collected following accepted EPA procedures and will be analyzed for asbestos content. The strategy for the collection of asbestos samples will be in accordance with EPA guidance document "Asbestos in Buildings: Simplified Sampling Scheme for Friable Surfacing Materials," EPA 560/5-85-030a, October 1985, 40 CFR 763 (AHERA), and appropriate air pollution control district regulations. According to OSHA Regulation 29 CFR 1926.1101, a minimum of three samples must be collected of each suspect ACM. 3. During the collection of bulk samples, damage to the materials sampled is often necessary to obtain representative samples. Converse will attempt to collect the bulk samples in inconspicuous locations (behind doors, in closets, in corners); however, it will not always be possible, and sample locations will be visible to the owner/occupant/tenant. Converse will patch interior plaster/drywall sample locations and exterior stucco walls with patching materials. However, Converse will not be held responsible for the quality or usefulness of the patching repairs. Samples of vinyl flooring materials will not be patched but will be encapsulated with spray adhesive. In addition to the bulk samples collected from the interiors of the building, samples will be collected from the roofs and exteriors of the building. However, Converse does require written authorization for roof sampling. Please note that puncturing a roof membrane will typically invalidate any warranty for the roof. In addition, Converse does not guarantee the quality or usefulness of roof patching material. 4. Samples collected will be processed for shipment to an accredited laboratory following EPA protocol and chain -of - custody procedures. Samples at the laboratory will be analyzed, on a normal turnaround basis (5 business days), for asbestos content using polarized light microscopy (PLM). The results of the survey will be evaluated to determine if asbestos -containing building materials are present in the collected and analyzed samples. The analytical test results will be presented together with the sample locations, a list �If•/i% Est 1979 m www.chambersgroupinc com