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14M�MMMMI <br /> 1 <br /> SITE ASSESSMENT WMK PLAN <br /> Shell Station 420 W. Kettleman Lane <br /> Lodi, California <br /> Aegis Project No. 89-013 <br /> Page 8 <br /> _ Section 4. <br /> 4.0 METffO.DS <br /> 4.1 Soil Boringn <br /> Soil borings will be drilled and soil samples collected under the <br /> direction of a state of California registered professional <br /> - geologist or engineer. The soil borings will be advanced to a <br /> depth of approximately five below grade b• ,using a hand auger. <br /> The soil borings will be advanced below-five feet to final depth <br /> _ using a truck-mounted continuous flight hollow-stem auger <br /> drilling rig. <br /> To reduce .-the possibility of cross--contamination.between .bore- <br /> holes, ,all downhole'-drilling'equipment w_'tll be cleanedwitYi a <br /> ! hagh_.pressurp`hot water d'etergent'wa .1 (sac steam aleanex) <br /> between each boring. To reduce cross contamination between <br /> Psamles, tsolutizt barrel sampler will be washed' in`'a tri-sodium <br /> ion;and double-rinsed'-in distilled water between <br /> each-sainpling. event:` <br /> . The borings will be. advanced using a -lO=inch-diameter:;k�ollow <br /> -�� -stem auger. Soil samples will be collected from the borings <br /> using brass liners in a California--modified split-barrel sampler. <br /> s Soil Samples will be collected at a maximum vertical spacing .of <br /> it 5.0 feet and will be screened in the field with a portable gas <br /> detector to quantify organic vapor content. Selected soil . <br /> samples .will by sent to a state-certified-laboratory for <br /> analyses. Soil samples will be analyzed for Benzene, <br /> q w.: Ethylbenzene, Toluene,. Xile BTEX) , total petroleum <br /> hydrocarbons (TPH) and ano ea The methods used in the <br /> analyses of sail sample are escribed in Section 4.0. <br /> pLJ <br /> The total volume of cuttings removed from the :soil borings is <br /> expected, to. be between two .and _three cubic yards. Maternal <br /> remove from the` borings will be:, <br /> e placed=on and i"covered''by <br /> vis ane. Two soil samples from the stockpile will be composited <br /> by the analyticalory to classify soil. One sample will <br /> a be analyzed for r ano The remaining sample.will be frozen <br /> and retained by e a oratory for further testix ;tf required. . <br /> The stockpiled.soil will be legally disposed of up�,t .^onfirmation <br /> of the contents from the analytical �;oil sample resulm; : <br /> Groundwater__.monitoring <br /> -wells-will:be-established-in-all- three-of ' <br /> the soil' borings to characterize groundwater conditions and <br /> �,. isconfirm gradient on `site. Following well installation the well <br /> heads will be surveyed by a licensed surveyor >`a a known datum 'or. <br /> }. r. benchmark. - Water .levels .will then be measured, and gradient <br /> flow direction determined. Following water level > „gig, the <br /> '._ <br />