ARCHIVED REPORTS XR0006446 - Laserfiche WebLink

Home Browse Search

time, sampler, and analyses to be performed, and documented on a chain of custody form They are placed in ziplock bags and stored in a chest cooled to 4 °C with ice The preserved samples are COC (chain of custody) delivered to the chosen laboratory Analytical Results TPH is the abbreviations used for Total Petroleum Hydrocarbons used by the laboratories for water and soil analyses The letter following TPH indicates a particular distinction or grouping for the results The letters "g", "d", "k", or "o" indicate gasoline, diesel, kerosene, or oil, respectively, i e TPH-d for diesel ranges TPH BTEX or MTBE are acronyms or abbreviations used for Benzene, Toluene, Ethylbenzene and all of the Xylenes (BTEX) and Methyl tertiary-Butyl Ether(MTBE), respectively MBTEX is the designation for the combination of the above five compounds Laboratory lower detection limits unless otherwise noted, due to matrix interference or elevated concentrations of target compounds, are as follows TPHg 50 ug/L MTBE 0 5 ug/L Benzene 0 5 ug/L Toluene 0 5 ug/L Ethyl Benzene 0 5 ug/L Total Xylenes 10 ug/L The less than symbol, <, used with a "parts per value" indicates the lower detection limit for a given analytical result and the level, if present, of that particular analyte is below or less than that lower detection limit Other abbreviations commonly used are ppm, ppb, mg/Kg, ug/Kg, ml/1 and uUl are parts per million, parts per billion, milligrams per kilogram, micrograms per kilogram, milliliters per liter, microliters per liter, respectively Chain of Custody Documentation All water samples that are collected by WEGE and transported to a certified analytical laboratory are accompanied by chain-of- custody (COC) documentation This documentation is used to record the movement and custody of a sample from collection in the field to final analysis and storage Samples to be analyzed at the certified laboratory were logged on the COC sheet provided by the laboratory The same information provided on the sample labels (site name, sample location, date, time, and analysis to be performed) is also noted on the COC form Each person relinquishing custody of the sample set signs the COC form indicating the date and time of the transfer to the recipient A cony of the COC follows the samples or their extracts throughout the laboratory to aid the analyst in identifying the samples and to assure analysis within holding times Copies of the COC documentation are included with the laboratory results in Appendix B of the sampling report