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recorded No water or chemicals will be introduced into the monitoring wells during well development • All developed water will be placed in drums on-site for later disposal _Groundwater Samalin� At least three wetted casing volumes of Iiquid are removed from each well by bailing with a clean disposable bailer A liquid sample will then be collected from each well with a clean disposable bailer and transferred into a laboratory supplied sampling container Each sample will be appropriately labeled and stored on ice from the time of collection through the time of delivery to the laboratory Groundwater samples are transported to the laboratory and analyzed within the EPA-specified holding times for the requested analyses Liquid-Phase Petroleum Hydrocarbons If liquid-phase petroleum hydrocarbons are present in a well, the thickness of the petroleum layer will be measured by collecting a sample in a transparent disposable bailer with a check valve at the bottom, or by measurement using appropriate fluid-level sounding equipment QUALITY ASSURANCE PLAN This section describes the field and analytical procedures followed by Delta throughout the investigation General Sample Collection and HandhnE!Procedures Proper collection and handling are essential to ensure the quality of a sample Each sample is collected in a suitable container, preserved correctly for the intended analysis, and stored prior to analysis for no . Ionger than the maximum allowable holding time Water Sample Collection for Volatile Organic Analyses For volatile organic analyses (VOA), the water sample is decanted into each VOA vial in such a manner that there is no meniscus at the top of the vial A cap is quickly secured to the top of the vial The vial is inverted and gently tapped to see if air bubbles are present If none are present, the vial is labeled and refrigerated according to the Soil and Water Sample Labeling and Preservation section Sod and Water Sample Labeling and Preservation Label information includes a unique sample identification number,job identification number, date, and time After labeling,water samples are placed in a Ziploc"'type bag and placed in an ice chest cooled to approximately 4° Celsius Upon arriving at Delta's office, the samples are transferred to a locked refrigerator cooled to approximately 4° Celsius Chemical preservation is controlled by the required analysis and is noted on the chain-of-custody form Sample Identification and Chain-of-Custody Procedures Sample identification and chain-of-custody procedures document sample possession from the time of collection to ultimate disposal Each sample container submitted for analysis has a label affixed to identify the fob number, sampler, date and time of sample collection, and a sample number unique to that sample This information, in addition to a description of the sample, field measurements made, sampling methodology, names of on-site personnel, and any other pertinent field observations, is recorded in the field records A California-certified Iaboratory analyzes samples A chain-of-custody form is used to record possession of the sample from time of collection to its arrival at the laboratory When the samples are shipped, the person in custody of them relinquishes the samples by signing the chain-of-custody form and noting the time The sample-control officer at