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3.8.3 Polychlorinated Biphenyls (PCBs) <br /> Exposure Route: Inhalation, skin abs4 irption,ref. Attachment F-NIOSH Guides <br /> Chlorodi hen Is(PCBs) <br /> Exposure signs/symptoms: See Attachment F(t ef.NIOSH Pocket Guide to Chemical Hazards) <br /> L Qualified Exposure Risk: Low <br /> Hazard Control(s): See Sections 3.8.2-Petroleu n Hydrocarbons <br /> CHEMICAL NAME ROUTES OF PUBLISHED EXPOSURE LIMITS <br /> AND CAS N ENTRY I CATEGORY I CONCENTRATION SOURCE <br /> Chlorodiphenyls-PCBs Inhalation EL-TWA(42%chlorine) 1.0Mg/m' Cal/OSHA <br /> 1336-36-3 Dermal EL-TWA(54%chlorine) 0.5 mg/m3 <br /> 4.0 GENERAL HEALTH AND SAFETY REQUIREMENTS <br /> 4.1 Air Monitoring - Toxic Metals <br /> L. Industrial hygiene monitoring will not be performed for the inorganic lead, arsenic, chromium VI, <br /> other T22 toxic metals or PCB sampling tasks being carried out for this project. Previous Negative <br /> Exposure Assessments for representative tasks within the past 12 months, using similar controls <br /> document exposures consistently below the 30 µg/m3 Action Level for inorganic lead which is <br /> representative of potential exposure to airborne inetals and PCBs(ref.T8 CCR§1532.1(d)(5)(A)). <br /> 6- <br /> 4.2 Air Monitoring -Petroleum Hydrocarbons <br /> The necessity for evaluating potential airborne concentrations of vapors from petroleum hydrocarbons <br /> will be determined during the project by the Project Manager or SSO. Based on preliminary <br /> information from previous sampling and characterization activities conducted at these sites, the <br /> 6. potential for significant exposure to these contaminants is low. <br /> If necessary, based on observations, odors, or other information which becomes available during <br /> monitoring activities,potential exposure to volatil organic hydrocarbons will be evaluated using a direct- <br /> reading photoionization detector(PID) equipped with a 10.2 electron volt probe; measurements will be <br /> �- made at the top of the monitoring well and in the c perators breathing zone. <br /> All measurements shall be recorded in the field logbook. The frequency or need for continued sampling <br /> will be based on results from initial measureme ts. Justification for discontinuing measurements shall <br /> also be recorded in the field logbook. <br /> The SSO shall be responsible for interpreting mc nitoring data and upgrading or downgrading the level <br /> of protection during field activities according to t ie following guide: <br /> V <br /> L <br /> Linden UST SI and Removal,Task Order No.34 Caltrans Contract 06AI895,EFIS 10-1300-0181-0 <br /> Geocon Project No.59800-01-34 - 15- October 2013,Revised September 2014 <br />