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Morita Brothers Service Station 19 July 16, 1992 <br /> 1 <br /> SITE LAYOUT <br /> The level of hazard associated with the work to be performed does not require <br /> ' dividing the site into formal exclusion, contamination reduction, and support zones <br /> However, care will be taken to avoid breathing vaporized gasoline fuel <br /> ' CONTAMINATION MONITORING <br /> Organic vapor monitoring of the ambient air shall be conducted at reasonable <br />' intervals as determined by project personnel The purpose of monitoring is to <br /> determine if vapor levels in the work area are high enough to warrant personal <br />' protection measures or evacuation of the site <br />' Organic vapor levels should be monitored using an OVM photoionization meter with <br /> an 11 7 eV lamp (probe), calibrated to benzene or a Foxboro@ OVA (organic vapor <br /> analyzer) 108 flame-ionization detector calibrated for non-methane hydrocarbons <br /> Background should be determined by taking readings before sampling begins All <br /> readings, background and others, must be recorded If any continuous measurement <br /> is observed to be 10 times over background levels in the work area, respiratory <br /> protective action will be required Lesser protective measures are at the field <br /> geologists or engineers discretion <br /> DECONTAMINATION <br />' Before leaving the site/work area, personnel must remove all protective equipment <br /> and wash their hands, faces and necks These washing procedures shall be observed <br />' before all work breaks <br /> To minimize the potential for cross-contamination, all excavation equipment shall be <br /> decontaminated before the start of drilling, between borings, and before removal <br />' from the site Sampling equipment shall be decontaminated before sampling and <br /> between sampling with washing with laboratory-grade detergent, a water rinse and <br /> a contaminant-free distilled water rinse <br /> 1 EB-8101-3 9207-EO37 WF <br />■ <br />