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�'�"?. ", .`r N:�" °'.t.° `rrm `tib�"� °�' �7arix%� s� � r� '°�,[ " ..;-=,'^.5 `F�°°��s^.a_ � � �� �.� •;tt �'�7+ <br /> NkN <br />�`�`���31;: <br /> s y <br /> Y <br /> t-A �. <br /> Ga 4 <br /> i 1 <br /> { <br /> Following proper development of each well, a nitrogen-driven <br /> bladder pump, stainless steel bailer, or teflon bailer will be used <br /> to evacuate an additional amount of water before samples are taken. <br /> The amount of water evacuated will be defined by the stabilization <br /> 4#A of pH and electrcial conductivity .readings for three consecutive <br /> measurements taken 5 minutes apart. When pH and electrical <br /> conductivity have been determined to have stabilized, water samples <br /> will be collected and submitted to the laboratory to be analyzed for <br /> BTS (EPA 602) , total petroleum fuel hydrocarbons (modified EPA 8015) , <br /> and total lead. Sample bottles will be filled directly from <br /> the <br /> discharge line of the bladder pump or from the bailer, and will be <br /> Pa filled to the brim. A teflon-lined cap (septa) will be placed on the <br /> Ea bottles, and the volatile organic analysis (VOA) bottles will be <br /> checked to determine that no air bubbles remain within. <br /> All water samples will be labeled and stored as described i <br /> soil samples section above, and transported to the BC laboratory t <br /> he <br /> Emeryville within 48 hours. in t <br /> Decontamination Procedures <br /> ` To prevent cross-contamination, soil sampling equipment and all <br /> Pumps, bailers, and their related tubing will be washed with <br /> laboratory-grade detergent, rinsed with tap water, and rinsed with <br /> jj deionized water before sampling and development. Downhole drilling <br /> > equipment and the develop <br /> ment <br /> le pump will be steam-cleaned before and <br /> between use at each boreh <br /> ualit - Assurance Plan <br /> The procedures to be followed in sample collection, identifica- <br /> tion, and handling at the ARCO site are described below. The <br /> analytical quality assurance program is also discussed. <br /> Sam le Collection and Handlin <br /> ;Proper collection and handling are essential to ensure the <br /> quality of the sample. All samples will <br /> be field personnel. The samples willbe collectedby <br /> byin experienced <br /> containers which have been precleaned at the lab <br /> containers will be clearly marked and dated for identification. All <br /> f samples will be cooled and stored for analysis no longer than the <br /> maximum :allowable holding time. <br /> Sample Identification and Chain-of-custod Procedures <br /> Sample identification and chain-of-custod <br /> '. sample integrity and document sample y Procedures ensure <br /> ' time of <br /> fi collection to its ultimate disposal. Eachssamplenaontainerfromesubmitted <br /> for analysis will .have . a label: affixed to identify the job number <br /> -sampler, date and .time of sample collection, and a sample number <br /> ke <br />