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r& Knowles Gas Station <br /> 202/799-5027.02 <br /> July 21, 1988 <br /> and underground storage tank locations. 0,1e of the eleven soil <br /> borings (SB-1) was drilled to a total depth of 46.5 feet within <br /> the former tank pit to explore the vertical nature of soil <br /> contamination (if encountered) .) 58-2 through SS-30 were drilled <br /> to total depths of 4.5 feet adjacent to former pump and/or <br /> product line locations. One additional boring (58-11) was <br /> drilled at a distant location from <br /> Potential hydrocarbon °sources - <br /> �„ for comparative purposes (Figure 2) . <br /> 4: <br /> All soil .borings were drilled wltY: a "truck-mounted drill <br /> i . rig, using 7.0-inch outside diams .:r n <br /> G.D. ) hol;aw-stem. augRrs. <br /> The drilling Was supervised by r, afield c :.D3r..11st working under <br /> ( the direction of a State cf Caofarn-a. pgasr� `�d aeL :dist. The f <br /> field geologist maintained d , u:. log of theatrials <br /> g drilld <br /> encountered during p} All sdx i �• <br /> g <br /> ( �F ' g- nerated <br /> during the drilling of SV-1 was 8'-Vr�.4 ' <br /> 4 in Denaftmen t of <br /> Transportation (DOT)-approved s3intatrl�r� tsn site, for disposal <br /> at a later date. <br /> ' a <br /> 1 SOIL SAMPLING <br /> r <br /> Soil samples for SB-1 were collected at 5-foot intervals <br /> { <br /> r beginning approximately 5 feet below grade to the bottom of the <br /> baring. The soil samples for SB-2 through SB-11 were collected <br /> beginning at ,?.5 feet below <br /> grade. Samples were collected during <br /> drilling using a 2.5-inch O.D, split-spoon sampler, lined with <br /> ,J three.._2....... h._.diameter.:.-by... 6-inch <br /> -long-brass -sample tubes_ The <br /> .._.... .. - -- . <br /> sampler was driven 18 inches ahead of 'the augers at each sample <br /> Point. Thecollected samples were sealed, cap and packed on <br /> Ice in an insulated cooler for subsequent delivery to Groundwater <br /> 3 Technology Environmental Laboratories (GTEL) in Concarci, Cali- <br /> fnrnia, accompanied by a Chain-of-Custody manifest. Each sample <br /> , . <br /> Ell IMINC <br /> 3 <br /> y <br /> _ <br />