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Ripona Market <br /> Groundwater Monitoring Well Installation Report <br /> Page: 5 <br />' The samples were refrigerated immediately for delivery to the laboratory and <br /> under no circumstances were opened by anyone other than laboratory personnel <br /> Chain of Custody records were maintained at all times <br />' 2.4 Soil Sampling <br /> p g <br />' All soil sampling equipment was thoroughly steam-cleaned before and between <br /> sampling to prevent cross contamination Relatively undisturbed soil samples <br />' were taken at intervals of not more than 5 feet in order to evaluate the subsurface <br /> materials <br />' Geoprobe" samples were obtained using a Geoprobe' Systems sampler with <br /> plastic liners For augured bonngs the soil samples were taken using a California <br /> Modified Split Spoon sampler with brass liners A 140 pound hammer repeatedly <br />' falling 30 inches drove the sampler The blow counts necessary to drive the <br /> sampler were recorded for each 6-inch interval to help evaluate the consistencies <br /> of the materials <br />' The laboratory samples did not have head space and were immediately sealed in <br /> their liners using aluminum foil lined plastic caps The remaining sample was <br /> removed from its liner to be used as an aide to the on-site geologist in logging the <br /> material at that depth <br /> All soil samples were delivered, under chain of custody, to GeoAnalytical <br /> Laboratories, an analytical laboratory licensed by the State of California for <br /> hazardous materials work The samples were analyzed for Total Petroleum <br /> Hydrocarbons (gasoline), BTX&E (Benzene, Toluene, Xylene, and Ethyl <br /> Benzene) and MTBE by method 8021B with confirmation by method 8260 <br /> 2.5 Groundwater Sampling <br /> A travel blank provided by the laboratory accompanied the sample vials from the <br /> time they were picked up from the lab to the time they were delivered back to the <br /> lab This travel blank was not analyzed since all samples did not contain <br /> detectable contamination <br /> All sampling equipment including the pump, bailer, and cables, used by sampling <br /> personnel, were disassembled, and steam-cleaned prior to commencement of <br /> sampling These procedures were also followed between each well, sampling <br /> point, and at the end of the sampling day De-ionized or organic-free water (also <br /> provided by the laboratory) was then introduced into the bailer as a final stage of <br /> . cleaning This water was then poured into sample vials to be used as a bailer <br /> blank <br /> I <br />