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' Off-Site Groundwater Investigation Work Plan page 8 Rainwater Car Wash,Manteca, California 95336 May 30, 2012 and two or three 40-milliliter volatile organic ampoules(VOAs)will be filled as required by the laboratory.The VOAs will be sealed with Teflon®-lined caps, labeled,placed on ice,and transported within 24 hours to Alpha ' Scientific Corporation of Cerritos,California.Each sample will be recorded on a chain-of-custody form identifying the sampler, sample name,type of sample containers, couriers, responsible laboratory personnel,and requested analyses.Copies of the chain-of-custody forms will be included in the laboratory report. ' 5.4 Equipment Decontamination The drilling augers and reusable sampling equipment will be decontaminated before and after drilling. ' Decontamination will be performed using the following procedure: • Washing in non-phosphate detergent and tap water wash; ' • Steam cleaning the augers; • Rinsing in clean tap water;and • Final rinse in deionized/distilled water. ' Disposable equipment intended for one-time use will not be decontaminated,but will be packaged for appropriate disposal. Cleaned small equipment will be stored in plastic bags. ' 5.5 Disposal of Investigation-Derived Wastes ' Soil cuttings and decontamination water generated during the drilling operations will be placed in Department of Transportation-approved 55-gallon drums,labeled,and stored at the site pending analytical result review and proper disposal. ' The drums will be identified with labels including the name of waste generator,type of waste(soil or water),and accumulation date. 5.6 Quality Assurance/Quality Control An integral part of sampling and analysis is QA/QC procedures to ensure the reliability and compatibility of all data generated during the investigation. The chemical data to be collected for this effort will be used to determine that the extent of contamination is properly evaluated. It is therefore critical that the chemical data be of the highest confidence and quality. Consequently,strict QA/QC procedures will be adhered to, including the following: ' • Observation of strict protocols for field sampling and decontamination procedures; and • Collection of one duplicate groundwater sample for selected laboratory methods at primary locations(at ' . least 10 percent). Laboratory calibration against internal standards,surrogate recoveries, laboratory control samples, instruments blanks,method blanks, and matrix spike/matrix spike duplicate samples to evaluate analytical precision and ' accuracy. 5.7 Field Variances ' As conditions in the field vary, it may become necessary to implement minor modifications to drilling locations as presented in this work plan,such as relocating borings due to unforeseen difficulties. These changes will be made at AA&A's discretion and without notification to the client. When appropriate,and in the event of major ' modifications, such as sudden interruption to the work requiring demobilization and additional costs,a property Ami Adini ' &Associates.dnc.