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a <br />i` NATIONAL ADVERTISING COMPANY— ADDITIONAL SUBSURFACE INVESTIGATION HEALTH AND SAFETI4 PLAN <br />`{ instruments must indicate that no airborne contaminant concentrations are .present which exceed the <br />:. established background levels. Until these requirements have been met entry will not be permitted. ' <br />4.9 CONTRACTOR SAFETY <br />In addition to the requirements of this Health and Safety Plan, subcontractorsof Earth Tech will observe <br />the rules outlined in the "General Safety Rules for Contractors" which are located:iri Appendix A of this <br />document. Compliance with these rules will bb observed by subcontractors during all phases of site <br />activities. <br />hslprojsuplcominachasp.doc <br />4 <br />02/09/98 <br />