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Bicigini Properties, Inc. Murch 2, 2000 Page A-1 APPENDIX A THE TWINING LABORATORIES, INC STANDARD OPERATING PROCEDURES This appendix contains the standard operating procedures used by Twining in performing the investigation. Twining observes these procedures in order to obtain consistent, reliable data. A-1 Standard Operating Procedures for Equipment Decontamination: Proper decontamination procedures reduce the potential for: cross-contamination among sample locations; and introduction of contamination from outside sources. Before.during,and following sampling operations,sampling equipment is thoroughly cleaned using a high pressure hot water(steam)washer or washed in a loNti--phosphate soap and water solution,and rinsed in clean water before each use. The type of soap used will depend upon project requirements. Well casing, screen, end caps, and centralizers will also be cleaned using the steam washer. Steam cleaning condensate will be containerized for later disposal. Generally,disposal will be the client's responsibility. 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. i Samples will be delivered under custody seal(s) 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' responsibilities include maintaining accurate records of the samples analyzed along with the analytical data produced. This involves labelling chromatograms and maintaining the laboratory numbers on subsamples taken from the submitted samples,labelling glassware used in the analyses,and properly labelling sample extract containers with each sample's laboratory number. Following analyses,the samples are transferred to a limited-access storage room. Chain-of-custody