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3ubsurface Clearance (SSC) Process Flow Chart <br /> Request the participation of a knowledgeable Contact Person at the site during the Site Walk. <br /> N <br /> Ensure subcontractor meets minimum ERM safety requirements <br /> Assign a"SSC Experienced Person"to administer the SSC process from start to finish. <br /> 'Q <br /> t� fl� IGather historical Develo the Level 2 _ Se ect <br /> P Vsite information Intrusive Work HASP preliminary <br /> such as blue including the SSC rtcaones and ground <br /> Q - prints, maps,as- Information Summary& /or Excavation disturbance <br /> built drawings, the Site Service Model Buffers locations <br /> etc. <br /> r <br /> Conduct the Site Walk <br /> Request and note Contact Person approval of disturbance locations in SSC Documentation <br /> N � <br /> G1 V <br /> a:+ = Verify preliminary ground disturbance Perform Utility Markouts(Public, sub <br /> •; i locations&scan area for visual clues. performed or ERM performed). <br /> Q V Integrate data into the Site Services Model and Critical Zone determinations as required <br /> W <br /> ' a Confirm Critical Zones(10 feet or 3 meters The preferred course of action is to NOT <br /> from Subsurface Obstructions)and/or CONDUCT GROUND DISTURBANCE <br /> Excavation Buffers(2 feet or 0.6 meters WITHIN CRITICAL ZONES.If disturbance <br /> exposed services). Mark with paint/tape. absolutely must occur inside a Critical <br /> Zone,the PIC must approve. <br /> Clear the Location or Area <br /> N Point Disturbance Excavation <br /> V Physically Clear to diameter larger than Communicate service routes/locations/ <br /> largest downhole tool&to the maximum of: depths and Excavation Buffers to <br /> M subcontractor <br /> V L_ • 2 feet(0.6 meters)beyond the bottom of <br /> Q' in the frost line at the site,or:• Outside Critical Zones to 4 feet(1.2 Physically Clear points as necessary as <br /> V meters),or the excavation proceeds <br /> • Inside Critical Zones to 7 feet(2.1 meters) <br /> I L6 or 20%deeper than the service's No mechanical digging inside Excavation <br /> expected invert elevation Buffers! <br /> REPORT ALL SAFETY EVENTS PROMPTLY PER HASP INSTRUCTIONS <br /> SSC Process Requirement may be waived by the PIC <br /> English Version,Last Rev.:Sept.2009 <br /> 1 <br />