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II City of Stockton - Van Buskirk Park Golf Course M 394-0074-01 S July 29, 1994 Page A-2 �I instances the deepest two samples and/or and sample collected from just above groundwater ' are selected for analyses. Samples intended for chemical analyses are sealed with Teflon tape and plastic end caps, labeled, placed on ice, and delivered to a laboratory, along with chain-of-custody documentation. The soil borings may be completed as groundwater monitoring wells, or abandoned b g Y Y grouting with a 6-sack cement slurry containing 3 to 5 percent bentonite or by backfilling with clean soil. Abandonment procedures depend upon the boring depth, depth to groundwater, project objectives, and regulatory requirements. For borings greater than 15 feet deep, grout is emplaced through the hollow augers which will extend to within 15 feet of the bottom of the boring. If required by the local regulatory agency, grout is emplaced by pumping through a tremie pipe which extends to within 15 feet of the bottom of the boring. The tremie pipe or augers are withdrawn from the boring in 5-foot increments as ' the boring fills with grout. SOPs for groundwater monitoring well installation are described in a subsequent paragraph (if pertinent to this investigation). Soil cuttings generated during drilling are containerized in United States Department of Transportation (DOT)-approved drums, or placed on and covered with plastic sheeting, and stored on site in an area inaccessible to the general public. Typically, the stockpiled soil is characterized by collecting and analyzing composite samples from the stockpile. Twining can recommend an appropriate method for disposition of the cuttings based on the analytical results. Disposal will be the responsibility of the client. 1 A-2 Standard Operating Procedures for Sample Handling and Chain-of-Custody Records are developed for samples which include: sampling date, sample type, location,job number, name of sampling personnel, and method of preservation. Each sample container ' is labelled immediately following collection. Chain-of-custody protocol, as described in United States Environmental Protection Agency, 1986, Test Methods for Evaluating Solid Waste, SW-846, Third Edition, is followed. Samples will be maintained at approximately 4°C. Upon arrival at the laboratory, the samples will be preserved for analysis as appropriate. ' Samples may be delivered to Twining's chemistry laboratory in Fresno, California. The Twining representative in charge of the field work transport or direct the transportation of the samples and custody forms to the laboratory, where the samples are transferred to the sample control department. A receiving clerk, or an authorized analyst, signs the custody forms, present a duplicate copy to the Twining representative, and transfers the samples to a laboratory analyst. The laboratory manager retains possession of the custody forms during ' analyses of the samples. The laboratory manager's responsibilities include monitoring the sample integrity within the laboratory. This involves assigning each sample a laboratory number and maintaining cross- reference between the sample's field and laboratory identifications. The analysts'