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~ -., .. l . . . 3,4 sample injection system for better contaminant control, A clean room sample preparation area is located immediately outside the main clean room but within the positive pressure envelope. The sample prepara- tion area also houses an ion chromatograph for analysis of major cations (Na, Mg, Ca, K, NH4' etc.) and anions (S04' N03' Cl, etc,). The second clean room laboratory is used entirely for rare heavy metal analyses for elements such as Ag, Cs, Rb and In. This laboratory c~n- tains a single beam flameless atomic absorption spectrophotometer, Each individual snow sample will be analyzed five times by flame- less atomic absorption techniques, This number of analyses permits the reduction and computation of a statistical uncertainty in the silver concentration measurements for the individual samples. Blanks and standards are processed continuously throughout the laboratory analysis program, The analytic,al procedures used produce silver con- centrations with typical calculated uncertainties of 10-20%, Details are available in the published literature by Warburton (1977) and Warburton, et al, (1968, 1977, 1982). C, Supporting Meteorological Data: The supporting meteorological data for this work will be obtained from the rawinsonde network of SCPP, SMUD and NWS, and from four mountain-top weather stations located on Slide Mountain, Red Mountain, Sierra Ski Ranch Summit and peavine Mountain, The upper air and moun- tain meteorological data will be stored, processed and analyzed with existing software (see Task I), The laboratory measurements of silver concentration will be compared with the meteorological observations. The precipitation data needed for the analysis will be obtained from the DRI gauges and from the BuRec and other SCPP program participants,