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.Y -.Y <br />X11 <br />All electrical lines, piping, and like items known to be associated with the tank shall be <br />isolated or disconnected. <br />If at anytime during the excavation, the lower explosive limit of the atmosphere around <br />the tank exceeds 25 percent, all work will cease and proper mitigation procedures <br />initiated. <br />DO NOT ENTER TANK (S) FOR ANY REASON. Appropriate control measures, such <br />as fencing and project supervision, must be employed to prevent any person from <br />entering into the tanks. There are NO EXCEPTIONS. <br />The existing , <br />re <br />removed, and after the _ sumps are installed and the concrete <br />been poured.-. <br />be followed when entering the sumps. <br />Excavated soil will be stockpiled on-site, placed on plastic sheeting, monitored for VOC's and <br />sampled for analysis by the accredited California Certified Laboratory. Soil, which is reported <br />to contain hydrocarbons in excess of acceptable concentrations, will be placed in roll -off bins, <br />removed from the site and disposed of at an approved treatment or disposal facility. <br />Mobil's Environmental Consultant, as per, requirements of the City of Los Angeles Fire <br />Department will collect soil samples. <br />Soil will be stockpiled based on initial screening using a photoionization detector (PID) <br />calibrated to a 50 PPM hexane standard. Hydrocarbon -impacted soil will be segregated from <br />