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Subsurface Envircnmental Investigation September 21, 1998 <br /> r Abandoned Lerner Service Station, Lodi, California AGS 38055-1 <br /> cuttings. generated during drilling were stockpiled around the . <br /> excavation in the fenced area of the site, disposal remain. the <br /> responsibility of RAMCON and the site owner. <br /> During drilling, soil samples were collected at 5-foot intervals <br /> using a California-modified, split-spoor. sampler equipped with <br /> clean brass sleeves. Samples were ccllec::ed by advancing.'tre <br /> boring to a point immediately above the sampling depth and then <br /> driving the sampler into the undisturbed native soil through the <br /> hollow stem of the auger. The sampler was driven 18 inches with <br /> a standard 140--pound hammer dropped 30 inches. The number of <br /> f blows required to drive the sampler each successive 6-inch <br /> - interval was counted and recorded to give an indication of soil <br /> consistency. <br /> A portable organic vapor analyzer (OVA) was used in the field to <br /> evaluate semiquantitatively the relative ;levels of contamination <br /> !' in each sample. The readings obtained from each sample are <br /> presented on the boring logs. OVA read-inqs-from samples <br /> t ---� <br /> g collecte.ja the ground-water surface (40 feet) range om <br /> t� ppm at the ground-water surface to 0.4 ppm at 60 feet below <br /> —`The soil samples collected above the ground=water surface <br /> in the vadose zone produced readings ranging:f'rom 0 to 538 ppm: <br /> w ' <br /> App/180FGeoSystems - -- <br />