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L <br /> gym, Bre J Much 7, 1992 <br /> L <br /> groundwater. A bentonite plug will be placed in the bottom of any soil boring which <br /> Lencounters groundwater to protect the integrity of groundwater prior to grouting <br /> the hole. <br /> L <br /> Soil samples will be collected at five foot intervals of depth beginning at five feet <br /> Lbelow surface grade. Soil sampling will be accomplished using a split-spoon sampler <br /> (ASTM D 3550 with shoe similar to ASTM D 1586) equipped with three 6-inch by 2.5- <br /> inch diameter brass sleeves for soil retention. The soil samples will be obtained by <br /> driving the sampler with a one hundred and forty pound hammer dropping thirty <br /> Linches in accordance with ASTM D 1586. <br /> The lowermost sleeve at each sample interval (corresponding to approximately 18 <br /> Linches below the actual sample interval) will be screened for total organic vapors <br /> with a portable photoionization detector (PID). Headspace vapor analysis is <br /> Lperformed by first discarding a portion of the soil retained at one end of the sleeve to <br /> produce a headspace. The sleeve is then capped and the probe of the PID protruded <br /> L through a hole in the cap and into the headspace for analysis. The PID readings will <br /> be recorded on the boring logs. The lowermost and uppermost sleeves will then be <br /> observed for lithology. <br /> L <br /> The middle sample sleeve will be immediately sealed with Teflon® film, capped, <br /> Lsecurity taped, labeled,and placed on ice for transportation to a California <br /> Department of Health Services (DOHS) certified laboratory. Strict chain of custody <br /> Lprocedures will. be utilized for all samples collected to ensure sample integrity and to <br /> document sample possession from the time of collection to the final destination. <br /> L Laboratory analysis will be performed on all of the samples from the vertical <br /> assessing boring, except those near surface samples from within the backfilled <br /> L excavation pit, and those samples which would duplicate the samples retrieved <br /> during the tank removal. ESE will analyze the deepest two "clean" samples not only <br /> in the vertical assessing borings, but in any lateral boring which field screening <br /> Lindicates the presence of fuel hydrocarbons as well as analyzing the "hottest" sample <br /> in each of these borings. Lateral assessing borings will be advanced to a sufficient <br /> Ldepth to assess that the phame does not extend laterally to that location, and will have <br /> LEB-8101-1 9203-E016.WP <br />