Trona 10 x 20 NTMS area, California: data report (abbreviated)

Results of groundwater and stream/surface sediment reconnaissance in the National Topographic Map Series (NTMS) Trona 10 x 20 quadrangle are presented. Two separate size fractions of surface sediments were collected at 898 sites, at a target sampling density of one site per 23 square kilometers. Groundwater samples were collected at 99 sites. Neutron activation analysis results are given for uranium and 16 other elements in sediments, and for uranium and 9 other elements in groundwater. Mass spectrometry results are given for helium in groundwater. Field measurements and observations are reported for each site. Data from groundwater sites include (1) water chemistry measurements (pH, conductivity, and alkalinity), (2) physical measurements (water temperature, well description where applicable, and scintillometer reading), and (3) elemental analyses (U, Al, Br, Cl, Dy, F, He, Mg, Mn, Na, and V). Data from sediment sites include (1) stream water chemistry measurements from sites where water was available, and (2) elemental analyses for sediment samples (U, Th, Hf, Al, Ce, Dy, Eu, Fe, La, Lu, Mn, Sc, Sm, Na, Ti, V, and Yb). Sample site descriptors (stream characteristics, vegetation, etc.) are also tabulated. Areal distribution maps, histograms, and cumulative frequency plots for most elements; U/Th, U/Hf ratios; and scintillometer readings at sediment sample sites are included. Uranium concentrations in sediments of the Trona quadrangle are relatively low, with a mean of 1.3 ppM and a maximum value of 8.7 ppM in the coarse fraction, and a mean of 3.3 ppM and a maximum value of 29.5 ppM in the fine fraction. Groundwater and surface water sampling sites are too widely dispersed to allow preliminary interpretation