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A sign, 24" x 36" in size, which reads "BLASTING WARNING SIGNAL" is three <br />long whistles from an air horn. ALL CLEAR SIGNAL is one long whistle". This • <br />sign is located at the mine entrance next to the mine iden[SflcatSon sign. <br />4.02.7 Topsoil Markers. Stockpiled topsoil areas are marked with signs reading <br />"TOPSOIL" and are 12" x 26" in size. Future topsoil areas will also be <br />marked as needed. <br />• <br /> <br />12-17 Revised 08/27/86 <br />