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<br />collected to generate a site specific modified scaled distance <br />equation. The calculations used to develop the equation, <br />together with the supporting data, must be submitted to the <br />Division for approval. <br />The modified scaled distance equation, once approved for Dowe <br />Flats, must be reviewed, updated if necessary, and re- <br />authorized annually. The data required for re-authorization <br />will be the same as for initial approval. The annual review <br />data should be submitted with the annual report for this <br />operation that will be required if a permit is issued. <br />A minimum of 30 days prior to the onset of blasting at the <br />Dowe Flats Quarry, the operator must solicit requests (via <br />certified mail) for pre-blast surveys from owners and <br />residents of any dwelling or structure within 3000 feet of the <br />boundary of the affected land. All requested pre-blast <br />surveys must be conducted, and signed written reports provided <br />to the Division and the person requesting the survey, prior to <br />onset of blasting. <br />4. The operator will restrict blasting to periods of relatively <br />high to no cloud cover, stable temperature with limited <br />potential for thermal inversions, and gentle- to moderate <br />winds. Relatively high cloud cover will be defined as 30,000 <br />feet, and moderate winds will be defined as 15 mph maximum <br />gusts. <br />The operator should be encouraged to contact the Division if there <br />are any questions as to the specifics of required vibration data <br />collection, or as to the nature of pre-blast survey information. <br />cc: Carl Mount, DMG <br />