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ON <br /> x <br /> 5 <br /> 1.4 Monitoring Well Development <br /> If monitoring wells are installed, each monitoring well will be developed after construction by bailing <br /> with a dedicated, laboratory-leaned teflon bailer until the water produced is relatively sediment free or <br /> until measurements of pH,specific conductance,and temperature stabilize- If the well is bailed dry during <br /> the development process,recharge rates was recorded. No water or chemicals will be introduced into the <br /> monitoring wells during well development. <br /> 1.5 Ground-Water Sam lin <br /> Following well development, a liquid sample was collected from each well with the sante teflon bailer <br /> used to develop the well. Each sample was appropriately labeled and stored on ice from the time of <br /> } <br /> collection through the time of delivery to the laboratory. <br /> 2.0 ANALMCAL l'ROCEDURFS <br /> All soil samples submitted to the laboratory were analyzed by EPA Method 8020 for benzene, toluene, <br /> ethylbenzene, and xylene (13TH,and by U.S. Environmental Protection Agency (EPA) Method 8015 <br /> modified for total purgeable hydrocarbons('MH). AD ground water samples submitted to the laboratory <br /> were analyzed by EPA Method 602 for BTEX and EPA Method 8015 modified for TPR <br /> 3.0 OTIALrrV ASSURANCE PLAN <br /> This item describes the field and analytical procedures to be followed throughout the investigt ion. <br /> ? 3.1_General Samglc Collectlen and Handling,Procedures <br /> r <br /> ~W' Proper collection and handling are essential to ensure the quality of asample Each sample was collected <br /> in a suitable container, preserved correctly for the intended analyses,and stored prior to analysis for no <br /> i longer than the maximum allowable holding time. Details on the procedure for collection and handling <br /> of soil and ground-water samples used on this project can be found in Section 1.0. <br /> 3.1 nm_se_identiticatlon and Chain-at'•Custody Pmcedures <br /> Samole. identification and chain-of-custody procedures ensure sample integrity and document sample <br /> possession from the time of collection to its ultimate disposal. Each sample container submitted for <br /> analysis had a label affixed to identify the job number,sampler, date and time of sample collection,and <br /> a sample number unique to that sample. This information,in addition to a description of the sample,field <br /> -� measurements made,sampling methodology, names of on-site personnel, and any other pertinent field <br /> . _ observations was recorded on the borehole log or in the field records. All samples—were. <br /> analyzed_by_a. <br /> California-certified laboratory. <br /> t ,.. <br /> i <br /> F <br /> _ a ' <br /> ,a <br />