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29 September 1998 T. <br /> AGE-NC Project No.'.98-0492 <br /> Page 5 of 6 <br /> 4.2.' SOIL SAMPLING PROCEDURES <br /> Soil samples will be collected.using Geoprobe:push-drien2-inch discrete soil sampler and four pre= . <br /> cleaned brass sleeves. All probe borings will be advanc d'using AGEs Geoprobe 5400 probing unit <br /> equipped with 1.1254nch probe rods. The exposed end 'of the second sleeve will be covered with <br /> Teflon sheets,.capped and sealed with tape,: . <br /> -Soils encountered in the borings-will be visually classified by an AGE geologist in accordance'with <br /> the-Unified.soil.Classification System(USCS). Additio x ally, soil samples with be.field screened for , . <br /> - the presence of volatile organic compounds using an'10 VM. <br /> Following sample collection, each preservedsample sleeve will be labeledwith the boring-location, . <br /> 'depth,time, date and sampler's initials. Appropriately s aled and labeled samples will be placed in. <br /> a chilled container under ice and transported under char -of-custody procedure to a DTSC-certified <br /> laboratory. _ <br /> 4.3. GROUND WATER SAMPLING PROCEDUI Es'_ <br /> For the collection of"grab" ground water samples; selected probe borings will be advanced to the <br /> top.of:the ground water table as identified by'collecti n of'a saturated soil'sainple..Once ground <br /> water has been encountered,_aGeoprobepush dater sampling device will be.advanced two - <br /> to three'feet into the water bearing-zone. Grab grou d water samples will be collected using"a <br /> Geoprobe water,sampling assembly or a,pre=cleaned o e-inch 0.01 slotted temporary well screen. <br /> Each ground water sample will be extracted by lowering a Teflon bailer through the Hollow center <br /> of the push rods.into the screen section. Samples will be collected in Iaboratory-�supplied, 407-m1 ' <br /> VOA vials 'containing 0.5-m1 of hydrochloric acid as sample preservative and one-liter amber <br /> containers. The.labeled. vials and containers will bejilacedin-a chilled container under ice and, <br /> transported under chain-of-custody t6 a alifamia-DT C-certified laboratory. <br /> 4.4. - EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample,collection will be thoroughly rinsed with clean water after being, <br /> washed with'a solution-of Alconox. All probing rods ill be cleaned prior-to advancement'at each <br /> probe boring,location. . <br /> Advanced GcuEnvironmentalf Inc., <br />