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iii iuiiiiiniiiiii R~~~~~E® COLONY SHALE OIL PROJECT TECHNICAL REVISION HYDROLOGIC MONITORING PROGRAM Pd AY 181987 MINED LAND 4gECLAMAT10N DIVISION During the past several years, the Colony Shale Oil Project has had a fairly extensive hydrologic monitoring program. For the purpose of this technical revision to Colony's Mineral Extraction Permit No. 80-47, the program is ' divided into five categories; 1) Stream flow, 2) Surface Water Quality, 3) NPDES compliance, 4) Groundwater levels, and 5) Groundwater Quality. Colony's present hydrologic monitoring program was approved by the Mined Land Reclamation Division in 1982. The Colony Shale Oil Project is basically proposing to delete groundwater monitoring and increase surface water monitoring requirements. Attachment dl is a summarized comparison of the hydrologic monitoring program proposed by this technical revision versus the ' presently approved program. In addition, the attached map shows the location of Colony's stream gaging stations, stream sample locations, monitoring wells, and discharge monitoring points. ' Stream Flow Colony proposes operating five stream gaging stations versus the three stations presently approved. Each station is equipped with a Stevens Continuous Recorder. ' Four of the stations are Parshall flumes equipped with V-notch weirs far use during low flow periods. The fifth station, F1R, is a concrete flow control structure/foot bridge installation that requires more fre- ' quent calibration with current measuring equipment. This station is also equipped with a V-notch weir during low flow periods. Field visits are made semi-monthly during most of the year. More ' frequent visits are made during the spring runoff and late summer rain- storm season. Several maintenance, record keeping, and quality control items are performed during each visit. Repairs are usually made on the ' spot. Each station is calibrated, using current meter flow measure- ments, at least twice per year. Recorder charts are pulled, reduced, and reported on a quarterly basis. The stations are winterized during October. As evidenced by Attachment N2, Colony has been able to collect a fairly complete stream flow record during the past several years. Surface Water Quality Colony proposes sampling streams on a quarterly basis at the four locations shown on the attached map. Rather than analyziny the samples for the 10 parameters currently required, Colony requests that the samples be analyzed for the 43 parameters listed in Attachment p3.