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i <br /> 9115,3 No drilling will be <br /> performed in the <br /> tank complex without the approval of <br /> the Technical Manager <br /> 91 1 5 4 Insure all submersible pumps have leak <br /> detectors If no leak detector is <br /> present, one must be installed or turn <br /> off the power to the affected <br /> submersible pumps <br /> 9 1 1 5 5 Determine liquid levels in tanks and <br /> record results <br /> 9 1 1 5 6 Determine tank burial depth (Tank top <br /> to grade ) <br /> 9.1 1 57 Tank storage levels should be monitored <br /> while drilling in tank complex This <br /> may be done before and after by <br /> comparing station sales to tank levels <br /> 9.1 1 58 Determine tank type and diameter <br /> -fiberglass or steel? <br /> -single or dual wall? <br /> -is an alarm system in operation9 <br /> 91 1 5 9 Determine distance between tanks <br /> 911510 When drilling within tank complex, hand <br /> excavate to tank top depth when <br /> possible <br /> 9.11512 When drilling outside tank complex, <br /> hand excavation should be 4 feet <br /> minimum <br /> 9.11513 Minimum clearance for drilling between <br /> tanks is 18" 12" or larger augers <br /> should not be used as initial drilling <br /> devices within the tank complex (8" <br /> maximum). Any exception to be approved <br /> by the Technical Manager <br /> 9.11514 Drilling in tank holes will be done <br /> only by personnel authorized to do so <br /> by the Technical Manager <br /> 9.116 Sufficient lighted barricades and cones should be <br /> • ordered to provide site security <br /> GSI7-1-91 Page 29 <br />