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DOCT.OS EN-MONNEWrAL, INC Sampling bledhods Proper sampling methods must be followed to assure that samples represent actual field conditions and that samples are labeled, preserved, and transported properly to retain sartiple irntegrnty This attachment describes procedures to be follow ed by Doulos Environmeatal, Inc (Doulos), dunag collection of samples of subsurface soil and groundwater Sampling procedures wzJl be based on samplmg guidance documents from the American Society of TestYiig and materials(ASTM), U S Environmental protection Agency (EPA), and California Department of Health Services (DHS) Actual sampling procedures tube employed will be based on field conditions and may differ from those described here A EXPLORATION BORINGISOUL SA.M pLING PROCEDIIRE,S Soil borings aid soil sampling,will be performed under the direction of a Doulos geologist The sail borings will be advanced using drillmg techniques appropriate for each project, as specified m tate project work plan Soil samples will be collected at ma i m m intervals of 5 feet Soil sampling will be done in accordance with ASTM 1586-84 Using this procedure, three 1 06- to 2-inch-diameter, 6-inch-length, brass or stauiless steel tunes are places] in a Califorrua-type-spirt-barrel sat p1cr, or a slide hammer with a single 6-inch by 2-inch brass or stainless tube by tapping the tube into the soil in the backhoe bucket with a hammer Tine sampler is driven into the soil by a 140-pound weight falling 30 inches or witli a slide hammer an hand anger samples After an initial set of 6 incbes, the numbtr of blows required to drive the sampler an additional 12 suedes is known as penetration resistance or the A_N=value "rhe AN value is used as an empirical Treasure of the relative density of cOh on less sons and the consistency of cohesive sails When eollecring a soil sample from a tank excavaLon or line erca.aucri, the soil sample a ill be collected by tappLng a baa>s stainless steel tube into the so: w-the backhoe bucket Upon recovery of the spin-barrel sampler or shdc hammer sampler, the brass or stainless srecl tubes con'mining the soil will be rerro�,ed One tube will be sealed at the a-ds %IL- plastic end caps The end caps will be secured to the ends of the tube to prevent loss of volatile consutuerts The sample will be labeled with an idenufncatron number, time, date, locations, and requested laboratory analysis The sample will then be placed in a plastic bag and stored at approium ely 4 degrees Celsius 8 in an ice chest for transport to the laboratory Sample custody procedures oud ed m Section E of this attachment will be followed This will be performed for each sample collected Soil zn one of the brass ar staitaless steel tubes from the split-barrel sampler will be extracted upon recovery, placed to a plastic bag, ar-d sealed Tor later screening for organic vapors using a photo ionization detector(FID) or,a flame noruzation detector(FID) The remaining portion of the:soil sample will be exauuned and a complete Ing of soil conditions will be reco-ded on a sod boring log using the Unified Soil Classification System 'Me so11 will be examined for grain size, color, aridd moisture content The split-barrel sampler or slide hammer sa-npler will be cleaned to prevent contamination across sample ig intervals using procedures described in Section C Soli generated from the soil borings will be stored m 55-gallon drums (unless otherwise directed by agencies or the client)labeled with the corresponding boring number, date, and address of the facility DECONTANM ATION AND DISPOSAL pROCEDURES All equipment that carnes unto contact wits potentially Contaminated soil, drilling fluid, air or water will be decontarruriated before each use Decontarnmation will consist of steam clean-ng, a high-pressure, hot- water imse, or uuodium phosphate(TSP) wash and freshwater rinse, as appropriate Dnlfing and sampling equipmew will be decontaminated as follows