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Lsettlement does occur, Twining 9hoqld be contacted to mitigate the problem. A-2 Decontamination Procedures: Prior to, during, and following the drilling operatist the auger and associated on sampling equipment are thoroughly cleaned :using a high pressure hot water washer. The hot water washer ,has a pressure of approximately 1,200 pounds per square inch (psi) and a water temperature of approximately 210 degrees !Fahrenhelit. This procedure is used to reduce the possibility of cross-contamination between samples. The auger and associated sampling equipment are placed on racks'.during the cleaning operations, and the tinsate generated retained in a steel wash trough. The rinsate is subsequently transferred into 55-gallon steel barrels. Each barrel islabeled as to its contents, The disposalofthis material. will be contingefit upon the analytical results :of, chemical analyses. The appropriate regulatory agency should be contacted prior to the treatment and/or disposal of this material-' A-3 Sample Handling and chain-of-custody Procedures: Records are developed for all soil samples including sampler's; name, sampling date, sample: type*, location, and method of preservation. i. Immediately following the collection and preparation of each soil sample,, the samples are.. placed int"o an ice chest containing Blue Ice'O for shipment to Twining's Fresno laboratory for analyses. The temperature within the ice chest; is recorded At the time of placement of each soil sample. and upon delivery to the laboratory- Chain-of-custody procedures, de.scr'ibed in the U.S. EPA's 'SW-846 Test Methodsfor Evaluating Solid Waste, 1,5�86, are followed..: All soil samples are taken to winingls laboratory in 'Fresno, calito ia. The project. geologist in charge of the, field investigation., transports or directs the transport Of bath thd t samples and custody forms to the laboratory where the samples are transferred to the sample control department. The sample control 'personnel, or an authorized anal yst, signs these custody 'forms, I : presentsp ,A duplicate copy to the l'oroject geologist �and transfers the samples to the appropriate lab ratory analyst to conduct the requested analytical, tests. The laboratory ::director retains possession of the custody forms during the analyses of the samples', I The director's responsibilities include monitoring the progress of: the samples and insuring the: samples' integrity within. the laboratory. This involvesassigning each sample a laboratory or.atory number and maintaining cross-refer8nce between the sample's field identification information ,and its laboratory identification. The analysts' responsibilities *,include maintaining accurate records of the samples analyzed along with the Janalytical data produced' This involves labelling chromatograms and maintaining the laboratory I numbers.. on. all subSOffigles takenit from the submitted samples labelling :all glassware used in,, the analyses, andproperly abelling sA*ple. . extract container's with the, sample:Is lab6ratory number. nc. Fresno Modesto OVIsalia. 6akers,eId