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T&T TRUCKING <br /> November'9;.1995. <br /> Pagc•3: <br /> Pro used Work <br /> To evaluate the'lateral•and vertical'.extent of petroleum hydrocarbons encountered in soils, we will ` <br /> advance. a triinimuin .of six soil..borings at'.the locations..shown on Figure 2, using a drill <br /> equipped with.a.push-point.sampling device: One.of the six borings wilt be dontinuously sampled <br /> to-a depth of 30 feet, and then sampled.at five-foot•maiimum:intervals. to the.first encounter:of <br /> -ground"water; or SO.feet,whrcheveris encountered first: Coritinuous.sampling will:be'eonducted to <br /> evaluate subsurface stratigraphy. Samples will.be collected for possible laboratory ana]ysts.every <br /> five feet from this boring, starting at 10"feet below grade Five of the borings will be drilled to a <br /> minimum"depth:of 30 feet below.`grade and soil samples will be collected at five-foot,maxirrium <br /> intervals. Soil saigpling will. begin at ten-feet below grade in all soil:borings, Samples will be. <br /> screened in the field using a photoionization detector to give an estimate of contamination. Soil . <br /> borings,will bedeepened if petroleum s hydrocarbons are encountered at their proposed total depths. <br /> The-materials cncountered�,during drilling will`be .logged by a.field geologist under..the direct <br /> supervision 'of�a. registered-geologist. Addition al..borings-,will-.be-.'drilied-.and sampled as ,field <br /> conditions warrant and time permits, to further evaluate the iateraF and vertical limits'of petroleum <br /> hydrocarbons in soil. All'samples will be prese'rved.on ice and selected samples will-be submitted <br /> with chain-of-custody documentation oto a California_certified laboratory. for analysis of- TPH.as <br /> gasoline using modified EPA nieth6d'8015, and for BTEX using EPA method 8020.. Detailed soil` . <br /> sampling—And'soil boring proeedures are appended <br /> Upon completion of drilling anct sampling the soil borings will be sealed to the surface b,, putnpirig <br /> a.slurry of cement:an'd bentomte-iiito each boring: Soil_generated during drilling actrvities`.will be <br /> placed:.' ekistitig stockpiled soils. <br /> A copy. of.our .site,safety,plan is enclosed., .Soil boring permit applications,will 'fol`low. under <br /> separate cover. <br /> At the request of`,San Joaquin,County an'attempt.will be made to:obtain a depth.to ground'water <br /> measurement from'the.deep soil ;boning _Ground water.samples'will only be collected.if obvious <br /> soil contamination is.observW.within ten feet'of ground water; if enebuntered,. <br /> Rep©rtin <br /> All- reports will follow 'the . recommendations outlined in `the Tri=Regional, :Board Staff <br /> Recommendations for'.Preliminary Evaluations and.lnvestigation of Underground.Tank Sites, <br /> August,30, 1991.: SubsegiEent to"field investigation, the data generated will be evaluated.and a. <br /> report.preparcd that,will include: .. <br /> 805 North Uinccdn,50fe E Dixon,"California � 5b20;2172 <br /> Phone 91.6.678,4353 Fax'916.678.1988 <br />