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h f� j . .L.� orfs w, SoflS_amnlf and Contaml ntio eduction E r Soil borings and soil sampling will be performed under the direction of a Delta engineer orcn The soil borings will be advanced using a truck-mounted drill rig utilizing hollow-stem augers.g Iagist. To reduce the chances of cross-contamination between boreholes,all downhole drilling equipment will be cleaned between each boring Ta reduce crass-contamination between samples, the sprit-barrel sampler will be p p washed in a saa solution and double-rinsed between each sampling event. i Soil sampling will be done in accordance with ASTM 1586.84. Using the procedure,a 2-inch outside. diameter split-barrel sampler or a 2-inch inside tside- _; a 140-point weight failing30 inches. -diameter Califomia•type sampler is driven into the soil by After an initial set of 6 inches, the number of blows required to s drive the sampler an additional 12 inches is value is used as an empirical measure of the r lat5ive densityas ofPenetration coh otnless ar the "N"value The N col..:sive soils. soils and the consistency of i Upon recovery,a portion of the soil sample will be placed into a with a photoionization detector !D glass jar and sealed for later screening (p • Another other portion of:he soil sample will be used for classification and description. That part of the soil sample collected is brass tabes with the Cal• MIl be stored at approximately 4°C for trans tfornia-type sampler transport to the Laboratory. �� 1!_z 5071 Cl�ccfR.a,n.. k4 As the samples are obtained in the field, they will be classified by the crew chief/geologist with ASTM D24&Wg. Representative portions of the samples will thea be returned to the>abosatoty for r a further examination and for verification of the field classification. Logs of the burin gs and identification of the various strata the N value, ~water-levet information and indicating the depth ' regarding pertinent information g the method of maintaining and advancing the borehole will be made. Charts illustrating soil classification procedure and the descriptive terminologyand fA made symbols used on the boring logs will also be ' r f.s .9 Soli-yam Is5�nln I}7 tethod --�.- After soil sample jars have been brought to room temperature, the head-space vapors of the soil sa -- -- - }ars will be screened with an PID? mple equipped with a 111.2 eV fame calibrated to benzene for direct fr in ppm The sample jar lid will be opened and the hNu probe immediately plated within the head of the jar. The highest observed pa - & reading will be recorded. � s - jm } s F