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PROPOSED WORK PLAN FOR PRE-TANK PULL SOIL ASSESSMENTAl Shell Service Station,Stockton, CA 5 Delta Project No.40-88-147 i Page 8 '. 3 ll I, i split-barrel sampler or a two-inch I.D. California-:type sampler is driven into the SO,,by a 140'-pound i weight falling 30 inches. After an initial set of six inches, the number of blows required to'"drive the sampler an additional 12 inches will be recorded-and is known as penetration resistance; or the "N' value. The N value provides some measure of the relative density of cohesionless,`.soils and the consistency of cohesive soils. Upon recovery, a portion of the soil sample will be placed into a glass far and sealed for later screening with a photoionization detector. This portion of the soil sample will be used for classification and description. That part of the soil sample collected in brass tubes within the California;,type sampler will be stored at approximately 40C for transport to the laboratory. . t _ 4.2 Soil Classification As the samples are obtained in the field, they will be visually and manually classified by;xhe crew chief ;j 1' in accordance,with ASTM:D 2488-84. Representative portions of the:samples will then be returned to the laboratory for further examination and for verification of the field classification: Logs'of the soil — borings indicating the depth and identification of the various strata, the N value, water-level informa- tion and pertinent information regarding the method of maintaining and advancing the borehole will be i; iI made. Charts illustrating soil classification procedure and the descriptive terminology'and sylmbols used i on the boring logs will also be made. ' $.0 QIIALITY ASSURANCE PLAN ' This item describes the field and analytical procedures to be followed throughout the investigation. 5.1 General Sample Collection and Handling Procedures Proper collection and handling are essential to ensure the quality of a sample. Each' sample will be collected in a suitable container, preserved correctly for the intended analyses, and;stored prior to r analysis for no longer than the maximum allowable holding time. Details on the procedure for collection and handling)of soil samples to be used on this project can be found in Section 4.0