1997-04-24_REVISION - M1977493 (12)

Home Browse Search

• Page 11 4.0 SURFACE WATER INVESTIGATION SAP The surface water investigation SAP defines objectives and tasks for the surface water investigation and provides guidance for all field work by defining the sampling and data- gathering methods to be used. 4.1 Surface Water Investigation Task Objective The surface water investigation will consist of grab sampling the Eagle Park Reservoir at a specific location, sampling reservoir recharge from the two interceptor canals, and sampling seepage from the sump located downgradient of the reservoir. The objective of sampling the reservoir surface water and seep water is to provide representative sampling, based on sound statistical principles, to ensure verification of contaminant source removal and attainment of in- stream water quality standards prior to delivery to the East Fork of Eagle River (Colorado Department of Health Water Quality Control Commission, 1994). Sampling of reservoir water during reservoir filling and operation will also demonstrate the interaction (or lack of interaction) • of water with the bottom materials in the reservoir. The objective of sampling the interceptor canals is to establish the water quality of this recharge source prior to its interaction with the reservoir materials. This information will indicate background concentrations for the reservoir water. 4.2 Sample Locations and Frequency Surface water samples from the Eagle Park Reservoir, the two interceptor canals, and seepage from the sump below the Eagle Park Reservoir dam will be collected for chemical analysis. Sampling of the Eagle Park Reservoir will occur beginning in the Fall of 1996 and continuing until the Fall of 1997. Samples will be collected quarterly at a minimum, and monthly when conditions allow access. During water delivery operations, surface water samples will be collected quarterly, or during times that water quality is subject to changing conditions that may affect water quality. The sampling schedule during water delivery will be finalized based on assessment of the results of the 1996-1997 surface water sampling. A sampling location will be established upgradient of the reservoir outlet for consistent sample collection during filling and operation of Eagle Park Reservoir. One sampling location is • sufficient for a reservoir of this size (approximately 59 acres). The sampling location will be CO2078 PRIVILEGED AND CONFIDENTIAL Environment CAPROJECTS\6102.001M I176102.001(6/20t961 al