AgdaPkt 2017-01-09 Closed and Joint

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TA. - Page 71 (vapor intrusion) (Phase I pp. 24 and 25). A vapor intrusion mitigation system typically uses a barrier (such as a waterproof sheet) that prevents vapors from entering the building or a ventilation system to remove the vapors. ENGEO determined that with such a vapor intrusion mitigation system, no further assessment of groundwater or soil gas would be necessary (Phase Ip. 25). Controlled Recognized Environmental Conditions (CRECs) are defined by the ASTM Standard as a past release of hazardous substances or petroleum products that has been addressed to the satisfaction of the applicable regulatory authority, with hazardous substances or petroleum products allowed to remain in place subject to the implementation of required controls. No on-site CRECs were identified. (Phase I ESA pp. I and 23) Historical Recognized Environmental Conditions (HRECs) are defined by the ASTM Standard as a past release of any hazardous substances or petroleum products that has occurred in connection with the property and has been addressed to the satisfaction of the applicable regulatory authority or meeting unrestricted use criteria established by a regulatory authority, without subjecting the property to any required controls. No on-site HRECs were identified. (Phase I ESA pp. I and 23) Non ASTM Considerations may include the presence of environmental conditions such as asbestos -containing materials (AGMs), lead-based paint, radon, polychlorinated biphenyls (PCBs), and other environmental considerations, which can affect the health and safety of site occupants. The Phase I ESA did not include an asbestos survey or, an evaluation of lead-based paint. After the Phase I ESA, an asbestos, lead, and PCB survey was undertaken and a report prepared for the project site (Limited Asbestos, Lead and PCBs Survey, 603-611 Jefferson Avenue, Redwood City, California; EnviroNova; February 24, 2016) (Asbestos/Lead/PCB Survey). The results of the Asbestos/Lead/PCB Survey follow: ■ Asbestos -containing materials (ACM). Eleven (11) material samples suspected ofpossibly containing asbestos were collected from the site building and tested for the Asbestos/Lead/PCB Survey. Seven (7) of the samples were found not to contain asbestos, and four (4) of the samples tested positive for asbestos. Roofing materials, roof sealants, piping insulation, and other sealants/insulation were not accessed during the survey but — based on the building's age (circa 1962) and construction - were assumed to be positive for asbestos. (Asbestos/Lead/PCB Survey pp. I and 2) The Asbestos/Lead/PCB Survey recommends that a California registered abatement contractor be utilized to remove and abate the positively identified areas prior to disturbance -related activities. Also, removal or abatement activities shall be monitored for compliance. (Asbestos/Lead/PCB Survey p. 3) In addition, asbestos removal is subject to standard regulations consistent with the ACMprotocol described in the DTPP program EIR (pp. 14-14 and 14-15). ■ Lead-based paint. Paint chip samples suspected of containing lead were collected from six (6) interior walls from the site building and analyzed for the Asbestos/Lead/PCB Survey. Of these, only the blue paint in the gym (sample from Interior — Main Floor Composite — Gym) exceeded lead thresholds. (Asbestos/Lead/PCB Survey pp. I and 3) The Asbestos/Lead/PCB Survey recommends that a California registered abatement contractor be utilized to abate any blue paint in the gym section of the building prior to disturbance -related activities. Additionally, the removal or abatement activities should be monitored for compliance. (Asbestos/Lead/PCB Survey p. 3) In addition, lead removal is subject to standard regulations consistent with the lead-based paint protocol described in the DTPP program EIR (pp. 14-15 and 14-16). ■ Polychlorinated biphenyls (PCBs). Material samples suspected of possibly containing PCBs were collected from an exterior doorframe on the east side of the building for the Asbestos/Lead/PCB Survey. According to the EPA, PCBs were used in or around windows and doorframes, and in other building materials, particularly between about the 1950s through the 1970s. PCBs have been detected in caulk in buildings, and could potentially be released into the air over time, a process known as off -gassing or out -gassing. (https://www3.epa.,eovlepawastelhazardltsdlpcbslpubslcaulklpdflpcb bdg_mat _aa.pd� viewed 319/16). Results of analysis indicated no PCBs were detected in the samples collected. (Asbestos/Lead/PCB Survey pp. 1 and 3) The Asbestos/Lead/PCB Survey recommends no further action to address PCBs (Asbestos/Lead/PCB Survey p. 3). However, the Phase I ESA noted that a pad -mounted transformer was observed on the project site, though no signs of leaks were observed. (Phase I pp. 6 and 21) According to the EPA, PCBs were used in electrical transformers installed in commercial buildings prior to 1978(http://www3.epa.,eovlreeion9lpcbslfaa.html. viewed 2/26/16). PCB removal is subject to standard regulations consistent with the PCB protocol described in the DTPP program EIR (pp. 14-14 and 14-15). ■ Radon. Though an evaluation of indoor air quality or radon was not included as part of the Phase I ESA, the report noted that the California Department of Health Services has conducted studies of radon risks throughout the state, sorted by zip code. Results of the studies indicate that 19 tests were conducted within the project 24