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qlr and 9Yovn ar t/iDl'gl'i o-~, along Tunnel Drive, 1 instrument at the water filtration F~lant, and ~_~ L Ll ._.J 1 instrument at the quarry hi~all to monitor.caorr-nx~ca,5. T.H.E. v j, has the option to monitor a 9 locations during ea~~h blast. Monitoring at each of the stations proposed should continue until there is at least 10 readings eF at or below the safe limit, ie: 1 inch/sec. peak particle velocity and the Division has had an opportunity to the review the exis ing blasting data to verify the absence of any offsite impacts. ~ bs}h 4~ r and 9f'O1"'~~a~ Vi ~raf j ~h 6. Monitoring results should be submitted to the Division on a quarterly basis as specified in the November 28, 1995 Soa.rd Order. Further, the Division agrees with T.H.E.'s commitment to keep precise blasting records of all blasting operations on file at the mine site and to make them available to the general public upon request. Although not required, the Division suggests that T.H.E.. install a small weather/s ation at or near the mine office to record the wind speed anc~',~~rection during each blast. Other observations such~s ~ercent cloud cover and cloud height will also be helpful and ~ b ~~r~c ~c~gd~,fid~4~,e weather conditions for blasting 1~~~ fear sky iariYin~o wind or an easterly wind. The cloud cover and/or wind conditions wilt affect the air shock waves from each blast ~3swell a/~~ the dus~.Ae er~7ted from t~}e,blast. ,/ ~~c~r.~ihy aF1-/iE WG~~14K G~r~~TlanJ fP~C~~i~QlriVt .f~iir~ ~ia/~I1vtnFj/n+ 7. It is not clear what type of instrument(s) will bfa used to J monitor Rio. air vibration and ~ha ground vibration from future blasts. The Division requests that T.H.E. specify the instrument(s) to be used and the sensitivity or detection limits of each. ~ 8. It appears that there is potential for interferance from truck traffic and/or the Southern Pacific Railroad during monitoring along Tunnel Drive. The Division requests that T.H.E. address this concern. A suggestion may be to monitor ground vibration from the railroad and from truck traffic along Tunnel Drive to establish normal background levels. Please comment. Please contact me as soon as possible if additional time is needed in preparing an adequacy response or if T.H.E. would F~refer to waive their right to a decision within 30 days. Such ai request will need to be in writing and should be received by the Division on or before February 16, 1996. ~ t/'~ , d .~ Sincerely, T7•~ S o ~ I y lie MlirJi~wi~t ~wPQC~j ,l~.w 6/,r~;n, . Thomas A. Schreiner Environmental Protection Specialist cc: see attached list M:\oss\Tezak.963