This revision to the 2002 report has been updated to include more rigorous tests of normality, revisions to the statistical methods used for some metals based on the results of the normality tests, and consideration of the depth-dependence of some sample results. The purpose of the 2002 report was to apply the recommended Cal-EPA procedure to the expanded data set for metals that was available at LBNL. This more recent approach differs from that recommended by the USEPA more » and used initially by LBNL (LBNL 2002). In addition, the California Environmental Protection Agency (Cal-EPA) subsequently published a recommended approach for calculating background concentrations of metals at hazardous waste sites and permitted facilities (Cal-EPA 1997). Since that time, many more soil samples were collected and analyzed for metals by the Environmental Restoration Program. These concentration values were estimated using the United States Environmental Protection Agency's (USEPA's) guidance that was available at that time (USEPA 1989). Local background concentrations of 17 metals were initially estimated by LBNL using data from 498 soil samples collected from borings made during the construction of 71 groundwater monitoring wells (LBNL 1995). Ambient conditions (sometimes referred to as 'local background') are defined as concentrations of metals in the vicinity of a site, but which are unaffected by site-related activities (Cal-EPA 1997). The purpose of the evaluation was to provide a basis for determining if soils at specific locations contained elevated concentrations of metals relative to ambient conditions. Your official UNT email address is:įor faculty/staff, typically entering your email address and clicking the OK button, you should be redirected to the UNT System login page, where you will login using your EUID and password.As part of its Resource Conservation and Recovery Act (RCRA) Corrective Action Program (CAP), the Lawrence Berkeley National Laboratory (LBNL) Environmental Restoration Program conducted an evaluation of naturally occurring metals in soils at the facility. For your Adobe ID, enter your official UNT email address but do NOT enter your password. When you launch an Adobe application that is part of Creative Cloud, you will be presented with an Adobe login screen asking you to login using your Adobe ID and password. UNT faculty and UNT staff (at least 75% FTE) have full access to Adobe CC on both their work computer and up to 2 personal devices.įaculty & staff: How to access your UNT-provided license To get started, email department name and chartstring to Get a discounted Adobe CC subscription for $55.55/school yearįaculty & staff: Use your UNT-provided license
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