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DOLWS ENMON"MEN 'A.L,INC • Sampling Methods Proper sampling mcthods must be followed to assn=that samples represent actual field coadtdons and that samples are labeled, preserved, and transported properly to recon sanTle integrity This attachment dcscnbes procedures to be folloRed by Doulos Environrneatal, Inc (Doulos), during collection of samples of subsurface soil and groundwater Sampling procedi=w-W be based on sampling guidance documents from the Amencan Society of Testing and materials(ASTM), U S Environmental protection Agency (EPA), and California Dcpmrwat of Health Services (DIES) Actual sampling procedures to be emploved wi11 be based on field crrndirons and may differ from those described here A EXPLORATION BOR IGISOEL SA-NeIX G PROCEDURES Soil borings and soil sampling will be performed under the direction of a Dcuhl s geolog:st The soil borings will be advanced using drillmg techniques appropriate for each projcct, as specified in the project work plan Soil samples will be collected at Mxzml-m intervals of 5 feet Soy smToling will be doge m accordance w,.h ASTM 158E-84 Using this ptocedttxe, thzee I D6- to2-icch�ta.:ever, 6-inch-1:ngth, brass or stainless steel comes are placed in a California-type-split-barrel sacTler, or a sl do hamnxr with a single 6-irch by 2-mch brass or stam:ess tube by tapping the tube into the soil ri the bacdoe bucket with a hammer The sampler is dn%ea into the soil by a 140-potmd we gbt faL'irg 30 Mches or with a slide hachure*on hand auger samples Ater an uutial set of 6 inches, tnie i m,i tr of tic vs rquired to dnve thhe sampler an additional 12 :.holies 13 known as penetration resis=a -' The AN= F alis is used as an ernpivcal rreasi:•e of the relative density of cokes en less sol s and the consistency of cohesive soils When coliec tag a soil sample from a Laztk exca-al.an or lint eT a 3z cn, the soil sample -ki'l be collected by tapming a bass stainless steel rube into the soil tr the back^Lle bLckct Upon recovery of the splrt-barrel sanpleT or slide bazurier sazT,er t~e buss or stumess steer tubes conmining the soil will be reinored Oce tube will be sealed a,de e-ds «rte plasr-c e_d caps The eau czps will be secured to the ends of the nibe to prevent loss of vola—e-cors:r c.� 'Ihe sample wit be labeled w,th an iCentrficanou namher, t:sie date, locations, and rNues ed l.aburatc-y ar alysis The sarTzmle wr11 there be placed in a ptaat,c bao ar,d stored at approx.rna e,} 4 deg-ees Celsius 8 in ar ice chest fer transport to the laboratory Sample custody procedures outlined is Se_io^ E e`Leis attachment wi[1 be followed This will be per-z)rn>;ed for each sample collected Soil in one of the brass or sm:. ess sLeel rubes from the split ba.-rel sampler uill be ez-racted upon recovery, placed in a plasuc bag azd sealed for later screening fcr organic vapors rung a photo toarzauon detector (PID) or a fla¢ne ionization detector(FID) Tee re-=ang per-Lor of the soil sample will be examined and a compliLe log of soil conditions will be recd-d--d on a soil boring log using the Unified Soil Classification System The soi' will be examined for gran size, color, a.--,d Moisture eo=-al The split-barrel sampler or slide hammer sa.-npler will be cleaned tc preieit coctarniaaLion across sampling intervals usiag prececures descnbed in Section C Sail gene-ared froth the soil borings will be storms in 55-gallon drums (unless otherwise directed by agencies or the cliea) 'abeled with the corresponding boring number, da'-e, and address of the facility DECON-fA-V[DiATIO\ AND DISPOSAL, PROCEDURES All equipment that comes moo contact wits potearially contarmnaxd soil, drilling fluid, air or water will be decontamuiated before each use Decontam.inadon will consist of rearm cleaning, a high-pressure, bot- waxT rinse, or tnsodwm phos*te (TSP) %acsh and freshwater nelson , az,apgroFriate Drilling and sampling equip:r,=will be decontaminated as follows