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Cleanup Program — Sacramento Office Cleanup Program —Sacramento Office California Department of Toxic Substances Control California Department of Toxic Substances Control 4 August 2020 4 August 2020 Page 3 Page 4 clay layer at approximately 25 feet bgs. The upper 7D to 80 feet comprise one heterogeneous and PERMITTING AND NOTIFICATIONS hydraulically connected water-bearing zone and a thick clay unit has been inferred to extend across most of Rough and Ready Island directly beneath the water-bearing zone (Geosyntec, 2018). A Well & Boring Permit will be obtained from the San Joaquin County Environmental Health Department (SICEHD) prior to commencing drilling activities. Underground Service Alert (USA) will be notified and a Several environmental Investigations have been conducted at Site 47 to assess impacts to soil and USA Ticket will be obtained for the drilling at least 2 working days prior to commencing drilling activities. groundwater. The results of the investigations identified detections of the following compounds in sell: DTSC will be notified prior to commencing soil disturbance activities in accordance with the metals (arsenic, antimony, copper, selenium, lead, and thallium), polyryclic aromatic hydrocarbons requirements in the pre-decisional land use covenant for Rough and Ready Island. (PAHs), and organochlorine pesticides (primarily DDT). Figures showing Site 47 soil data are provided in Appendix B. No remedial actions have been implemented except for stabilization of soil with lime Field Investigation Activities treatment beneath McCloy Avenue In the western portion of the property during construction of the roadway. Geosyntec is currently preparing a revised Feasibility Study, with the recommended remedial California C-57licensed drilling and Cone Penetration Test (CPT) companies will be subcontracted to alternative to incorporate TCC's proposed development plan for the Site. advance the proposed borings and CPTs at the Site. Fifty-two (52) borings will be advanced using a hollow stem auger methodology to depths of 10, 20, 30, and 50 feet bgs. Six (6) CPTs wil I be advanced to Pre-Field Activities total depths of 50 and 100 feet bgs: (Table l; Figure 2). All locations will be han ugered to 5 feet b s to confirm the absence of shallow utilities or otherobstr ions nor to drillin ort e10 hollowst HEALTH AND SAFETY boringsi en tronmental sampllnb a hand auger will be advanced to atotal depth f5 feetb s o collect environmental samples prior to drilling using the hollow stem auger methodology to A site-specific health and safety plan (HASP) has been prepared for the investigation activities and is 1 t ebonnigstotaldepth. mg egwpmentmcudingaugem willa Ream cleaned prior to presented as Appendix C. The HASP was prepared in compliance with applicable laws, including n. All soil sampling equipment will be decontaminated using a light detergent Occupational Safety and Health Administration (OSHA) and California Division of Occupational Safety and triple rinsing with distilled water. Prior to drilling, each boring location will be scanned using a and Health (Cal/OSHA) standards for hazardous waste operations (29 Code of Federal Regulations [CPR] private utility locator to minimize the possibility of damaging unidentified subsurface utilities. Soil will be 1910.120, and 8 California Code of Regulations [CCR] §5192, respectively) and Proposition 65 (22 CCR logged by or under the supervision of a CalNornha certified Professional Geologist in accordance with §12000 to §14000). The HASP also includes special COVID-19 measures. AS TM D2488-09a Standard Practice for Description and Identification of Soils, which references the Unified Soli Classification System. The soil samples and cuttings produced during drilling will also be Personnel conducting the Investigation activities at the Site will be Hazardous Waste Operations and screened for volatile organic compounds (VOCs) within the shallow portion of the boring using a Emergency Response (HAZWOPER; CFR 1910.120, and 8 CCR §5192) trained and will follow procedures photoionization detector (PID). outlined in the HASP. Daily health and safety tailgate meetings will be conducted by the Haley & Aldrich lead field staff to discuss the potential hazards associated with each phase of work, adtlress any health Once the drilling and sampling activities have been completed, all borings will be backflled using cement and safety concerns that may have developed, and conduct health checks to mitigate the spread of grout using the tremie method, in accordance with SI CEHD permit requirements. A professionally COVID-19. All personnel have the authority to stop work if deemed necessary due to safety concerns. licensed surveyor will use a global positional system (GPS) device with the capability of recording positions within an accuracy of 60 centimeters to record the boring and sampling locations. The Due to the elevated concentrations of arsenic in shallow soil at the Site, dust control will be vital to surveyed locations will be based on the North American Datum of 1983 (NAD83) and the North mitigate the generation of dust and prevent potential Inhalation while conducting investigation American Vertical Datum of 1988 (NAVD88). activities. An evaluation was completed for the specified contaminants of concern (COCs) for the dust equivalent in ambient air based on historical Site data from GeoTracker. All estimated fugitive dust SOIL SAMPLING concentrations were above the Total Respirable Dust permissible exposure limit (PEL) for PM10 (5 milligrams per cubic meter [mg/m']), therefore COC-specific dust monitoring is not required. Dust Most of the soil samples will be collected for geotechnical testing and only select samples will be generation will be mitigated by wetting the surface soil in the proposed drilling area immediately prior collected for environmental analysis. Regardless of the purpose of the sampling, soil sampling and to beginning drilling activities. It Is anticipated that level D personal protective equipment (PPE) will be handling will be conducted using the following methodology to ensure sample Integrity and protect used, however on-site personnel will be prepared to upgrade to level C PPE and use a respirator if dust samplers from potentially impacted soil. Soil samples will be collected by removing the soil from the cannot be adequately mitigated in the work area. A copy of Haley & Aldrich's Respiratory Protection barrel of the hand auger or geotechnicaI sampler with gloved hands and placing It Into the appropriate Plan, which describes the procedures for using a respirator, If required, is Included as Appendix D. container or placing clean plastic end-caps on minim steel liners or Shelby tubes, where appropriate. H��y New, clean gloves will be worn while collecting each environmental soil sample. The hand �auger and any L�M M ICH � ICH