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SummerHill Apartment Communities 10391.000.000 Rollins Road-Carolan Avenue, Burlingame November 19, 2014, Revised January 14, 2015 protection, and high visibility vests. In the unlikely event significant unforeseen environmental conditions are discovered, work will stop and San Mateo County Environmental Health will be contacted. A primary and backup PID unit will be maintained onsite for the duration of fieldwork. Each unit will be fully charged and calibrated daily. Work activities will be conducted Monday through Friday between 7:00 AM and 6:00 PM. Excavation will be performed using a combination of scrapers, backhoes, track-mounted excavators and/or loaders. The contractor will adhere to OSHA guidelines. If excavations require shoring, it will be provided by the contractor. 8.2 SOIL EXCAVATION AND STOCKPILE MANAGEMENT The development will consist of a significant engineered cut of up to 6 to 9 feet below the ground surface in the northern portion of the Site for the construction of the underground parking. Prior to beginning the excavation,the soil in the planned excavation area will be characterized to determine the appropriate disposal options and to allow for excavation and off-haul without first stockpiling on site(Section 7.0) A PID will be used to screen soils during the excavation. Also, if soils exhibiting evidence of environmental impact (e.g., odor or staining) is identified at the proposed margins or bottom of the excavation, the excavation will be advanced to a greater depth and/or lateral dimension as appropriate until impacted soil exhibiting evidence of impact have been removed. Impacted soils, if encountered, will be stockpiled onsite. As appropriate and necessary, to prevent potential impact to underlying soils or surfaces, stockpiles will be placed on 10-mil plastic sheeting. The soil stockpiles will be covered with 10-mil plastic sheeting and secured to prevent dust or runoff during storm events. Appropriate dust control and stormwater best management practices (BMPs)will be implemented during the soil mitigation activities. The soil stockpiles will be profiled for landfill disposal in general accordance with the "CAL- EPA Department of Toxic Substances Control (DTSQ Information Advisory - Clean Imported Fill Material" document. The specific laboratory profile will be determined prior to excavation activities; however, it is anticipated as a minimum, the stockpile samples will be analyzed for Total Petroleum Hydrocarbons as diesel and motor oil with silica gel cleanup (EPA 8015) and CAM 17 metals (EPA 6010B). 8.3 CONFIRMATION SAMPLING Where impacted soils are encountered and removed, verification samples will be collected from the resulting excavations. Sample areas exhibiting target analytes (see list below) in excess of the corresponding screening levels will be excavated an additional 12 inches vertically and - 8- ENGEO --Expect Excellence—