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�'v.t� ,. 3' M;,,•b'"''w .Lxw, ....,ww �F"Ky"�,�ryk; ,. f� ...'�' •"w'�"° �n� � ^n" <br />..... strf .� j t a,� _•ns �? ui4st'...`� -�yT�, r,.;n r- �$e'�r E✓ +wr•''�-', �++��. =�� - '"1' k n �_s,�"'� �.,.�. 34u�. <br /> APPENDIA D <br /> Methods,Analytical Procedures, <br /> Quality Assurance Plan,and <br /> Site safety Plan <br /> Page DI <br /> I _ <br /> E.a l METHODS <br /> 1.1 -Soiliny and CoatarninatiQn Reduction <br /> Soil borings and soil sampling will be performed under the direction of a Delta engineer or geologist. <br /> ! The soil borings will be advanced using a truck-mounted drilling rig utilizing hollow-stem augers. <br /> Lit To reduce the chances of cross-contamination between boreholes, all downhole drilling equipment <br /> l ' will be cleaned between borings. To reduce the possibility of cross-contamination between samples, <br /> the split-barrel sampler will be washed in a soap solution and double-rinsed between each sampling <br /> ;s <br /> i . <br /> event. <br /> a,s Soil sampling will be done in accordance with ASTM 1586-84. Using the procedure, a 2-inch <br /> + % outside-diameter split-barrel sampler,or a 2-inch inside-diameter California-type sampler is driven <br /> into the soil by a 140-pound weight falling 30 inches. After an initial set of 6 inches,the number <br /> of blows required to drive the sampler an additional 12 inches is known as penetration resistance, <br /> 1 M <br /> or the"N"value. The N value is used as an empirical measure of the relative density of cohesionless <br />+, soils, and the consistency of cohesive soils. <br /> Upon recovery, a portion of the soil sample will be placed into a glass jar and sealed for later <br /> t a screening with a portable photoionization detector(PID). Another portion of the soil sample will be <br /> used for classification and description, That part of the soil sample collected in brass tubes within <br /> the California-type sampler will be stored at approximately 4°C for transport to the laboratory. <br /> 1.2,' Classification <br /> E� As the samples are obtained in the field,they will be classified by a geologist/engineer in accordance <br /> with ASSTM: D248E-84. Representative portions of the samples will then be returned to the <br /> labo.atory for further examination and for verification of the field classification, logs of the <br /> borings indicating th^ depth and identification of the various strata, the N value, water-level <br /> information, and pertinent information regarding the method of maintaining and advancing the <br /> ., borehole will be made. <br /> 1.3 Soll Sample SrreeninQ/Portable PhQtoronizatlon Detector Method <br /> After soil sample jars have been brought to room temperature, the headspace vapors of the soil <br /> sample jars will be screened with a portable PID equipped with a 10.2 eV lamp calibrated to benzene <br /> for direct reading in parts per million (ppm). The sample jar lid will be opened and the probe <br /> immediately placed within the headspace of the jar. The highest observed reading will be recorded. <br /> d, <br />