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TECHNICAL MEMORANDUM <br />AmerAlia, Inc. <br />October 19, 1999 <br />Page 11 <br />Concentrations of TDS, trace constituents, and pH increase downstream. Some seasonal effects are <br />apparent, with electric conductivity and TDS lowest during the month of February. <br />6.0 RECOMMENDATIONS <br />It is recommended that water quality data be collected monthly for a period of six consecutive months <br />from the sites specified in the "Surface and Ground Water Monitoring Plan" for the Project site. After <br />this time, the site-specific data should be compared to the existing information compiled in this <br />document. Correlation between the data should be analyzed to see if the existing data is useful in <br />characterizing background water quality and quantity for the Project site. If a good correlation is found, <br />the results should be discussed with the Colorado State Division of Minerals and Geology in regards to a <br />variance to the standard five consecutive quarters background water quality collection period. <br />7.0 REFERENCES <br />' Colorado Mined Land Reclamation Board, 1999. Mineral Rules and Regulations for Hard Rock, Metal <br />and Designated Mining Operations. Amended April 1999. <br />Colorado Department of Public Health and Environment (CDPHE), 1999a. Water Quality Control <br />Commission, Regulation No. 41, The Basic Standards for Ground Water. Amended March 2, <br />1999. <br />' 19996. Regulation No. 31, The Basic Standards and Methodologies for Surface Water. <br />Amended March 2, 1999. <br />' Helsel, D.R., and R.M. Hirsch, 1992. Statistical Methods in Water Resources. Studies in Environmental <br />Science 49, Elsevier 529p. <br />' Meglen, R.R., and R.J. Sistko, 1986. Exploratory Data analysis on Lease Tract C-a Hydrogeochemical <br />Data Base: Pieceance Basin, Colorado. Center for Environmental Sciences, University of <br />Colorado at Denver, for the Bureau of Land Management, Final Report Contract <br />' No. CO-910-CT-5-024. <br />Saulnier, G.J., Jr., 1978. Genesis of the Saline Waters of the Green River Formation, Piceance Basin, <br />' Northwestern Colorado. Ph.D. Dissertation, University of Nevada, Reno, 120 p. <br />Saulnier, G.J., Jr., 1999. Groundwater Quality in Piceance Creek Basin. Duke Engineering & Services, <br />' Austin, Texas. <br />' 2ndPineiTechnical Mcmo.doc 10/19/99 TRC HYDRO-GEO CONSULTANTS <br />