Laserfiche WebLink
,i <br />EASTSIDE COAL COMPANY, INC. <br />P. O. Box 161 <br />Sil,, Colondo 81652 <br />(303)8762944 <br />April 18, 1986 <br />Jeffrey Deckler, Reclamation Specialist <br />Mined Land Reclamation Division <br />423 Centennial Building, 1313 Sherman Street <br />Denver, CO 80203 <br />III IIIIIIIIIIIII III <br />999 <br /> <br />APR 21 ~ <br />Colo, ~~ol Na ~ ~ -r;p <br />Re: 1985 Hydrology Review Questions - Letter of April 11, 1986 <br />Dear Mr. Deckler: <br />Review of the hydrology data indicates that the laboratory analyses did <br />not include temperature values. The temperature values submitted to you <br />are the field water temperatures. <br />The two water sampling sites, Harvey Gap outlet above the mine and Harvey <br />Gap below the mine, are approximately 1800 feet apart. The Harvey Gap <br />seep water enters the stream between these points. The seep water flow <br />has an average flow of 5 gpm. Allowing for seepage losses along the <br />stream and evaporative losses, the water flow was assumed to be the <br />same at these two points. Eastside Coal is preparing a revision to <br />relocate the monitoring point below the minesite to a location where <br />Parshall flumes are currently installed. Water flow measurements will <br />be taken at the Parshall flumes. <br />Field pH readings have been taken with pH paper at streamside. The <br />laboratory takes pH readings at room temperature using a standardized <br />pH meter. Differences in field and lab pH readings could be do to <br />differences in the temperatures at the time of readings, unknown ions <br />occurring naturally in the water causing inaccurate readings of pH <br />paper, or the lab pH meter calibration is inaccurate. Also, the time <br />period between the field and lab measurement allows mineral ions to <br />react which could potentially change the pH. <br />Sincerely, <br />~~`'~ /may , <br />St~hen Self C~ <br />General Manager <br />SS/11 <br />