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0 Contamination Reduction Zone: A formal decontamination zone should not be required during the preliminary investigation . However , an area will be designated in the event extreme gasoline contamination is encountered. The decontamination zone will be an area where personnel can clean protective equipment . A waste container will be placed outside of the exclusion zone so contaminated equipment can be placed inside and covered. Support Zone : A Support Zone , the outermost zone , must be defined for each field activity . Support equipment is located in this uncontaminated or clean area. Normal work clothes are appropriate within this zone . The location of this zone depends on factors such as accessibility , wind direction ( it should be up wind of excavation ) , and resources (e .g. roads , utilities , shelter ) . Decontamination Procedures Petroleum hydrocarbon liquids and vapors are anticipated. Due to the volatile nature of hydrocarbons that may be encountered during the initial excavation and sampling operations , decontamination of equipment and vehicles will be of minimal importance since the volatile hydrocarbons will rapidly vaporize . Therefore , no formal decontamination procedure will be followed with the exception of general cleaning no eating, drinking or smoking will be permitted in the exclusion zone . All personnel involved in work activities will be instructed to wash their hands , face , neck and forearms at the end of the work day . soap , water and towels will be provided at the site for this purpose . The field personnel will also be instructed to shower at home at the end of each work day . As work progresses , the nature of materials handled and the extent of contamination may possibly require formal decontamination procedures and delineated work/clean zones . However , we do not expect that such formal procedures will be necessary at this site and will only proceed at the Safety Officer discretion. In the event extreme contamination is encountered, decontamination of personnel , equipment and vehicles will be important to insure that contamination dose not spread to unsuspecting people and property . Personal decontamination mainly involves personal hygiene . Contamination should not be present on the skin if the proper protective methods specified in this plan are used . However all field personnel will be instructed to fallow these guidelines to insure that contamination dose not remain on equipment , sample containers or in contact with their bodies .