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�.►' 60Advanced Environmental Concepts, Inc. Soil &Groundwater Excavation Work Plan y All on-site employees will take reasonable precautions to avoid unforeseen hazards. After documenting their understanding of the SSP,each on-site employee will be responsible for strict adherence to all points contained herein. Any deviation observed will be reported to the SSO and corrected. On-site employees are held responsible to perform only those tasks for which they believe they are qualified. Provisions of this SSP are mandatory and personnel associated with on-site activities will adhere strictly hereto. V Jo b Hazard Analyses: Hazards likely to be encountered on-site include those commonly encountered when operating any mechanical equipment, such as the danger of falling objects or moving machinery. Simple precautions will reduce or eliminate risks associated with operating such equipment. An excavation contractor has been employed to deliver and operate all excavating equipment. Qualified personnel only will have any contact with this equipment. All on-site personnel, including the excavation contractor and his employees,are required to wear hard hats when in close proximity to excavating equipment. +-d Latex sampling gloves will be worn by persons collecting or handling samples to prevent exposure to contaminants. Gloves will be changed between samples and used ones discarded, to avoid cross- contamination. Proper respiratory equipment will be worn if vapor contamination levels on-site exceed action levels as determined using a Photoionization Detector(PID). Furthermore, no on-site smoking, open flame or sparks will be permitted In order to prevent accidental ignition. Risk Assessment &uMma Exposure to chemicals anticipated on-site include gasoline,diesel, and benzene,toluene, and xylene (BTX). r,r These chemicals represent a hazard because they are moderately to extremely toxic and most are highly flammable. Threshold Limit Values(TLV's), Short Term Exposure Limits(STEL's) and Toxicity levels (LD50, oral-rat), all in mg/kg (ppm), are listed below: Compound TLV STEL Toxicity Gasoline 200 300 ---- Diesel 50 75 ---- Benzene 10 25 4894 Toluene 100 150 5000 Xylene 100 150 4300 Exposure Monitoring Plan: A PID will be used to monitor vapor concentrations around the site. Should concentrations exceed TLV's, protective measures will be taken. Passive dosimeter badges will be placed in downwind locations if PID readings indicate high levels of volatile organics in the breathing space. w 4 Project: AEC 97V-1805 2