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L <br /> L <br /> - - MLTW LEVEL MONITORING - - - - - - - - - - - — <br /> Fluid levels are monitored in the wells using an electronic interface probe with conductance sensors <br /> The presence of liquid-phase hydrocarbons is verified using a hydrocarbon-reactive paste The depth <br /> to liquid-phase hydrocarbons and water is measured relative to the well box top or top of casing Well <br /> box or casing elevations are surveyed to within 0 02 foot relative to a county or city bench mark <br /> GROUNDWATER SAMPLING <br /> Once total depth is reached with the Geoprobe` equipment, grab-type groundwater samples were <br /> collected by lowering a 10 foot section of 1/4 inch Teflon tubing with a stainless steel check ball <br /> attached at the bottom, below the static water level and filled by gently pushing the tubing up and <br /> down The tubing is retrieved and the sample is properly decanted to 1-hter and 40-milliliter glass <br /> containers The sample containers were filled to zero headspace and fitted with Teflon-sealed caps <br /> Each sample is labeled with the project number, well number, sample date, and sampler's initials After <br /> the samples have been labeled and documented in the chain of custody record, they were placed in a <br /> cooler with ice at approximately 4 degrees Celsius(°C)prior to and during transport to a state-certified <br /> laboratory for analysis <br /> CHAIN OF CUSTODY PROTOCOL <br /> Chain of custody protocol is followed for all soil and groundwater samples selected for laboratory <br /> analysis The chain of custody form(s) accompanies the samples from the sampling locality to the <br /> laboratory, providing a continuous record of possession prior to analysis <br /> DECONTANENATION <br /> Dnlhng/Geoprobe�m equipment is decontaminated by steam cleaning before being brought onsite The <br /> rods were also steam cleaned before each new boring is commenced Prior to use, the sampler and <br /> sampling tubes were brush-scrubbed in a Lnqun-nox and potable water solution and rinsed twice in <br /> clean potable water Water level meters and water sampling equipment were also decontaminated <br /> before each measurement or sample is collected to avoid cross-contamination between momtoring <br /> wells <br />