Laserfiche WebLink
AVACHMENT A <br /> MELD PROCEDURES AND LABORATORY ANALYSIS <br /> Groundwater Sampling Procedures <br /> The inoundwater sampling procedure consisted of first measuring the water <br /> water level indicator, and checking each <br /> level in each well with an electronic <br /> well for the presence of separate-phase hydrocarbons using a clear Teflon <br /> bailer. None of thr'ci,e wells contained separate-phase volum <br /> es <br /> water using a <br /> ' wells were then purged of approximately four casing H, and <br /> 2-inch diameter centrifugal pump. During purging, temperature, p <br /> electrical conductivity were monitored c � tQetiom fcpumrgin <br /> g�that <br /> g water <br /> parameters were stable prior to sample <br /> i levels were allowed to partially Sere <br /> tabilize. Groundwater samples roved <br /> '. collected using a Teflon bailer, placed into appropriate EPA-app <br /> containers, labelled,logged onto chain-of-custody documents, and transported <br /> on ice to a California State-certified laboratory. The chain-of-custody <br /> documentation is attached. <br /> Laboratory Analysis <br /> Groundwater samples were analyzed in the laboratory f�Hh o ne)c and <br /> total petroleum hydrocarbons calculated as gasoline ( O <br /> benzene, toluene, ethylbenzene, and xylenes (BMX compounds}. Extraction <br /> was performed by the purge-and-trap technique, 30. Analysis <br /> he OHSUFTEPA eLoOmethod, and <br /> for T1?H-gasoline was performed according <br /> analysis for B'IEX compounds was by EPA Method 8020. Final detection was <br /> by Qas chratnatography using a flame-ionization detector and a photo- <br /> ionization detector. Groundwater samples were also analyzed for semi- and <br /> non-volatile hydrocarbons calculated as diesel (TPH-diesel) by the DHS <br /> L FT method. All analyses were performed by a California State-certified <br /> laboratory. <br /> December 31,1991 <br /> 3100102014Q91 <br />