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r DOLTLOS ENVIRONMENTAL,INC. Sainpltng Methods Proper sampling methods trust be followed to assure that samples represent actual field coaditions and that samples are labeled, preserved, and transported properly to retain saniple integrity This attadtment descnbes procedures to be followed by Doulos Environmental. Inc (Doulos), during collection of samples of subsurface soil and groundwater Sampling procedures will be based on sampling guidance documents from the American Society of Testing and materials(ASTM), U,S Environmental protection Agency(EPA), and California Departnient of Health Services (DHS) Actual sampling procedures to be employed will be based on field conditions and may differ from those described here A. EXPLORATION BORING/SOM SAIMPLING PROCEDURES Soil borings and soil sampling will be performed under the direction of a Doulos geologist The soil bortngs will be advanced using drilling techniques appropr ate for each project, as specified in the project work plan Soil samples wtll be coUccted at maxinwm intervals of 5 feet Soil sampling will be done in accordance with ASTM 1586-84 Using this procedure, three l 06- to 2-inch-diameter, 6-inch-length,brass or stainless steel tubes are placed in a California-type-split-barrel sampler, or a slide hammer with a single 6-inch by 2-titch brass or stainless tube by tapping the tube into the soil in the backhoe bucket with a hammer The sampler is driven into the soil by a 140-pound weight falling 30 inches or with a slide haimner on hand auger samples After an imtial set of 6 inches, the number of blows req�xred to drive the sampler an additional 12 inches is known as penetration resistance,or the ANS value The AN= value is used as an empirical measure of the relative density of cohesion less soils and the consistency of cohesive soils When collecting a soil sample from a tank excavation or Bite excavation, the soil sample will be collected by tapping a brass stainless steel tribe Into the soil in the backhoe bucket Upon recovery of the split-barrel sampler or slide hammer sampler, the brass or stainless steel tubes coutarning the soil will be removed One tube will be sealed at the ends with plastic end caps The end caps will be secured to the ends of the tube to prevent loss of volatile constituents 'Ile sample will be labeled with an idenuficauon number, time, date, locatioris, and requested laboratory analysts The sample will then be placed in a plastic bag and stored at apprwumately 4 degrees Celsius 8 in an ice chest for transport to the laboratory Sample custody procedures outlined is Section E of flus attachment will be followed This will be performed for each sample collected Soil in one of the brass or stainless steel tubes from the spirt-barrel sampler will be extracted upon recovery, placed in a plastic bag, and sealed for later screening for organic vapors using a photo ionization detector(PID) or a flame iotimauon detector(FED) The remaining portion of the soil sample will be examined and a complete log of soul conditiuris will be recorded on a soil boring log using the Unified Soil Classification System The soil will be examined for gram size, color, and moisture content The split-barrel sampler or slide Hammer sampler will be cleaned to prevent contarninatuon across sampling intervals using procedures described in Section C Soil generated from the soil borings will be stored in 55-gallon drums (unless otherwise directed by agencies or the client)'Labeled with the corresponding boring number, date, and address of the facility DECONTAMNATION AND DISPOSAL PROCEDURES All equipment that comes into contact with potentially contaminated soil, drilling fluid, air or water will be decontaminated before each use. Decontamination will consist of steam cleaning,a high-pressure, hot- water rinse, or trisodium phosphate(TSP) a ash and freshwater rinse, as appropriate Drilling and sampling equipment will be decontammnated as follows