25F - AGMT HAZARDOUS MATERIALS SURVEYS

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Environmental ■ Facilities ■ Geotechnical ■ Materials Terracon will conduct a visual assessment of the interior, exterior and roofing of the buildings to Identify homogeneous materials suspected of being asbestos -containing materials (suspect ACMs) such as thermal system Insulation, surfacing materials, and miscellaneous materials (e.g., floor tiles). Suspect materials will be physically assessed for friability and evidence of damage or degradation. Samples of suspect ACM will be collected for laboratory analysis by an AHERA-accredited asbestos building inspector. A copy of the inspector's AHERA certification will be included in the report. Bulk sample collection will be conducted in general accordance with the sampling protocols outlined In USEPA 40 CFR 763.86. At least three samples of each homogeneous material will be collected, per AHERA protocols. Terracon estimates seventy (70) bulk samples for the Arco Gas Station and sixty (60) bulk samples for the single family residence will be collected for analysis (additional samples will be charged at the rate presented on the separate fee proposal). Sample collection will result in some Isolated and minor damage to surveyed areas; however, attempts will be made to limit such damage to the extent necessary for sample collection. Terracon will not be responsible for repair or touch-up of sample locations. In addition, Terracon will not perform sampling which requires demolition or destructive activities such as knocking holes in walls, dismantling of equipment or removal of protective coverings. Terracon may perform sampling which requires demolition or destructive activities with prior written authorization from the client and/or building owner. Reasonable efforts to access suspect materials within known areas of restricted access (e.g., crawl spaces) will be made provided these areas are not determined to be permit -required confined spaces, or to pose a health or safety risk to Terracon personnel. Sampling will not include suspect materials which cannot be safely reached with ladders. A laboratory accredited by the National Voluntary Laboratory Accreditation Program (NVLAP) will analyze bulk material samples by visual estimation using polarized light microscopy (PLM). Copies of the laboratory analysis report, the chain of custody, and the laboratory's accreditation certificates will be appended to the report. 2. LEAD PAINT SURVEY The lead paint survey will consist of bulk (paint chip) sampling of suspect painted surfaces of representative colors and homogeneous applications and analyzed by Flame Atomic Absorption Spectroscopy (AAS, US EPA Test Method SW846-3050B-7420) or equivalent. A total of thirty (30) paint chip samples, approximately fifteen -twenty (15-20) paint chip samples per location, will be collected at the discretion of the lead Inspector based upon field observations of the inspector. Collection of paint chip samples Will require removal of small portions of paint suspected of containing lead. The paint will be removed until the base surface is encountered (i.e., wood, metal, concrete, etc.). Damage caused by this sampling will not be repaired by Terracon and costs for any repairs are not included in the fees for this work. Paint chip samples will be submitted to the analytical laboratory on a standard 5 -day tum -around basis 3. HAZARDOUS BUILDING MATERIAL SURVEY Visual Survey — Terracon will conduct visual surveys of the buildings to assess for the possible presence of equipment containing polychlorinated biphenyls (PCBs), mercury, and chlorofluorocarbon (CFCs). Sampling and analysis for PCBs, mercury or CFCs will not be conducted as part of the planned scope of work. PCBs — Potential PCB -containing equipment, such as fluorescent light ballasts, hydraulic elevators and lifts, and electrical transformers will be inspected for external labels, serial numbers and signs of leakage. Terracon will attempt to interview the owner of the equipment, to assess whether suspect equipment contains PCBs. Terracon will consult with the client, and itCity of Santa Ana Public Works Agency — Various Environmental Services (RFP No. 18-043) 16 — A2 Hazardous Materials Surveys 25F-275