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~~ ~ ' • IIIIIIIIIIIIIIIIIII ~ ~~z- 3~ <br />PEABODY COAL COMPANY <br />ROCKY MOUNTAIN DIVISION <br />10976 EAST HARVARD AVENUE <br />SUITE d00 <br />July 26, 1985 <br />DENVER. COLORADO 80391 <br />19091 3979809 <br />.~~~.2 ~~~~~C <br />Ms. Sandra Squire <br />Monitoring and Enforcement Section <br />Water Quality Control Division <br />4210 East 11th Avenue <br />Denver, Colorado 80220 <br />Dear Sandy: <br />.. n "i ,1 <br />RE: NONCOMPLLANCE OF PERMIT CONDITIONS, <br />NPDES PERMIT CO-0037656 <br />MESA GRAVEL PIT <br />ROUTT COUNTY, COLORADO <br />During the second quarter of this year, eight (8) of the eleven (11) water samples <br />taken from the Mesa Gravel discharge point showed a field pH in exceedence <br />of 9.0 units. As you are aware, we suspect that these high pH values are directly <br />caused by naturally occurring algae blooms in the pond. To date, information <br />we have gathered from algal enumeration, chlorophyll and nutrient analyses supports <br />this theory. A findings report of our algae study will be sent to you as soon es <br />our most recent samples have been analyzed and interpreted. <br />The two (2) total suspended solids (TSS) excursions dated April 4 and April 16 <br />were due to the naturally high TSS concentrations in the spring snow melt runoff. <br />As committed to you in Jay Mednick's April 12, 1985 letter to you, we have resurveyed <br />the pond. As soon as we have finished working up the field notes, we will let <br />you know if the pond still meets the proper sediment storage design criteria. <br />If you have any questions, please call. <br />Sincerely, <br />~~ `."` <br />J. Slade Dingman <br />Hydrogeologist <br />kmt <br />c: Craig Jennings <br />Dennis Jones <br />Jim Lunan <br />Jay Mednick <br />Leonard Shearer <br />Tom Wainwright <br />Steve Vardiman <br />