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24 November 1997 . . _ <br /> AGE-NC Project No. 97-0351 ; <br /> 'Page 3 of.5 <br /> previous site investigations at the site, ground water was encountered:at a.depth of 12.feet bsg. The <br /> . prevailing ground water.flow'in this portion of western Stockton flows generally-to the northeast, <br /> while localized ground water flow may vary during wiiterlsummer cycles. <br /> 3.0. . SCOPE OF WORK., _ <br /> 3:1:. -PROBING AND SAMPLING <br /> A-subsurface.investigation-at the site is necessary to'. etermine.the lateral and vertical extent of <br /> hydrocarbon-impacted soil,and ground water on the eastern portion of the property.(East'UST Area). . <br /> Initially, AGE proposes to ,advance four soil probe Borings.at the 'site. Probe borings will be <br /> advanced to depths of approximately 20 to 25 feet b g (below surface grade) 'using direct push <br /> technology (DPT).A11 probe borings will.be advanceusing AGEs,Geoprobe 5404 probing unit <br /> equipped'-with 1.125.4nch.probe rods. .Proposed probe oring locations are.illustrated in Figure 2. . <br /> Soil samples will be collected at five=foot intervals using a Geoprobe sampler and four brass sleeves. <br /> Upon sample retrieval; the second brass Sleeve will be emoved from the;sampler. The ends of the <br /> sleeve will be.immediately covered with Teflon tape or aluminum sheets,.capped and sealed with <br /> tape. Each sample will be placed in a chilled container-for transportation to a,state-certifi ed <br /> laboratory. Each sample sleeve will be labeled with thefollowing: boring location,depth,time,.date <br /> and sampler-'s initials. <br /> Grab ground. water samples will be collected from the probe borings using a-Geoprobe.water . <br />. sampling assembly. After collection, samples wil1,be s tored iri a chilled container and transported' <br /> to a state-certified laboratory. <br /> : 3.2. EQUIPMENT DECONTAMINATION <br /> All sampling tools and brass sleevds used for sample collection will be thoroughly rinsed with clean <br /> water after washing with a solution of Alconox: All,Geo probe rod's are cleaned prior to advancement <br /> in each probing location. ' <br /> 3.3. LABORATORY ANALYSIS . <br /> Selected soil and grab ground water samples will be malyzed for total petroleum hydrocarbons., <br /> ` quantified as gasoline(TPH-g);volatile aromatic hydroc bons(benzene,toluene,-ethyl benzene and <br /> - total xylene:BTE&X) and Volatile organic compounds (VOCs) with oxygenate identification in <br /> Advanced GeoEnvironmental,Inc. <br />