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TASK-SY-TASK RISK ASSESSMENT JCompiete One Sheet for Each Task) TASK DESCRIPTION Task 2b — Installation of boreholes end/or groundwater monitor wells,installed to unknown depth below ground surface to characterize the presence of known impact to soil. Installation may be conducted with hand auger, geoprobe or with a hollow- stem auger drill rig, depending on depth. Soil samples will be collected with a hand sampler or split spoon sampler, and using a spoon or spatula placed into glass sample containers. Soil will be placed back into the borehole, unless not allowed then into drums. EQUIPMENT REQUIRED/USED (Be specific,e.g.;handtools.heavy equipmarrc, imtrummma, PPEI Drill rig type to be specified by task. Additional items include use of hand tools for drilling operations, monitoring with a OVM or HNU PID, and detection tubes (Draeger) , if necessary. PPE will include gloves (surgical and leather), steel toed boots, hard het, eye protection w/side shield and hearing protection (optional). Tyvek(optional) if muddy conditions. 'r POTENTIAL HAZARDSIRISKS CHEMICAL ® Hazard Present Risk Level: ❑ H ® M ❑ L What Justifies Risk Level? Intrusive activities bring subsurface materials to the ground surface + the drill rig generates heat which may volatilize organics in the soil. Monitoring with a PID, breathing zone and downhole, conducted during all intrusive activities, Draeger tubes for benzene (IF SUSPECTED)may be used if readings in breathing zone are sustained above 1 RRU (action level). Mod. Level D will be used unless benzene level indicate stop work or PID readings indicate need to elevate LOP. PHYSICAL ® Hazard Present Risk Level: ❑ H ® M ❑ L What Justifies Risk Level? Hand auger/Drilling operation pose potential for slip, trip, fall, noise, entanglement,pinch, cuts, bruises, encountering buried debris, and severity of amputation or death. Personnel will have training for and implement safe work practices during drill rig operations. Leather gloves will limit cuts and bruises. Good housekeeping will be implemented to reduce risk of slip, trip and fall hazards. Personnel will use hard hat, steel toed boots, safety glasses, and ear plugs (optional). BIOLOGICAL ® Hazard Present Risk Level: ❑ H ❑ M IN L What Justifies Risk Level? Work location is within an operational area that is covered with asphalt or weeds and little debris in the area where animals, rodents or snakes could be present. Personnel will be cognizant of the work location and any potential presence of hazards. RADIOLOGICAL ❑ Hazard Present Risk Level: ❑ H ❑ M ❑ L What Justifies Risk Level? None suspected. LEVELS OF PROTECTION/JUSTIFICATION Leval D and Modified Level D with cotton coveralls, eye protection, hard hat, steel toed boots, surgical gloves, leather gloves, and tyvek if operations become muddy or dusty. See discussions above for justification. Upgrade to Level C if PID exhibits 1 — S RRU sustained above background in breathing zone and if benzene (IF SUSPECTED) detected at less than 1 ppm with Draeger tubes. Stop work if sustain >AC RRU or > = 1 ppm benzene in breathing zone. SAFETY PROCEDURES REQUIRED AND/OR FIELD OPS UTILIZED Drilling Safety Guide (attached), daily safety briefing of procedures and safe work practices for operations. Corporate Health and Safety Page 11 of 36