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• (Page 3) • MINE ID # OR PROSPECTING ID # M-83-139 INSPECTION DATE 7 6 94 INSPECTOR'S INITIALS GSC augmentation plan approved by the OSE (see PB-2). Alternatively, the operator can backfill the pit or demonstrate that the water in the pond results from surface runoff. 6. Water well #12, owned by Public Service Company (PSC), is located in the southwestern corner of the permit area. The well intercepts water in the Leyden Coal Mine, an underground mine located below the gravel operation at a depth of approximately 700 feet. The mine extends about 1.5 miles north, close to an area now occupied by Rocky Flats Industrial Park (RFIP). According to a memo (attached) by the Colorado Department of Health (CDH), dated March 16, 1994, there is a concern that hazardous constituents (chlorinated solvents and metals) known to have contaminated the ground water beneath RFIP could also contaminate the water being pumped in Well #12. This water is pumped from the mine and diverted either to Leyden Creek or to the Pioneer gravel operation. PSC acquired an NPDES permit in 1990 to dispose the water into Leyden Creek and the CDH memo stated that the water was diverted to the sand and gravel operation shortly after the discharge permit was acquired. Durinq the inspection, the water from Well # 12 was being pumped into one of Pioneer's sediment ponds. Plane are to use the water at the wash plant once it ie installed. The assumption here is that some water used in the sediment ponds or in the wash plant will seep into the ground. Pursuant to Rule 3.1.6, the operator is required to minimize disturbance to the quality of the groundwater. The operator will need to obtain a groundwater permit from the CDH or provide evidence one is not needed. It will be necessary to determine if the ground water pumped from Well #12 is currently contaminated. According to Mr. Del Montoya of PSC, this water is sampled and analyzed monthly and quarterly. The operator needs to submit results of analytical results of analyses on the ground water from Well #12 obtained within the last year (see PB-3). The analyses should include methods for determining the presence of chlorinated solvents and metals. Data may be available from the unit manager for PSC's Environmental Department, Me. Louise Meyerkord at 294-2814. Based on the findings of this analysis, the well water may need to be tested periodically for both metals and organic contaminants. The operator will need to submit a plan to do eo. 7. The Division will need to receive verification that a stormwater management plan has been filed with the CDH. Please submit by August 22, 1994 (see PB-4). I & E Contact Address NAME Scott Callahan OPERATOR Pioneer Sand Comoanv Inc. STREET 7608 Hichwav 93 CITY/STATE/ZIP Golden. Colorado 80403 cc: Patricia Nelson Sarah Johnson Sandy Marik Colorado Department of Public Health and Environment Water Quality Control Division WQCD-PE-B2 4300 Cherry Creek Drive South Denver, Colorado 80222-1530 Susan Chocky Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division HMWMD-HWC-B2 4300 Cherry Creek Drive South Denver, Colorado 80222-1530 Dick Wolfe, P.E. Water Supply Branch North Aegion Division of Water Resources 1313 Sherman Street, Rm. 816 Denver, Colorado 80203 cc: Carl Mount, DMG ~ CE ~ BL FS ^ ~ [~ HMWMD (CH) E ~W [j QCD (CH) ~ OTHER