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' Development will be performed using a surge block and submersible pump until the water <br /> Produced will be relatively sediment-free All water produced from the wells during development <br /> will be placed in drums on site for later disposal <br /> ' 4.3 Gr Sampling <br /> Ground Water Sa p A <br /> Each newly installed monitoring well at the site will be purged using a submersible pump until at <br /> least four well casing volumes of water are removed or the well is pumped dry Wells that are <br /> pumped dry will be allowed to recover to approximately 85 percent of the static water level prior to <br /> sampling After purging, a water sample will be collected from each well with a clean disposable <br /> bailer Each sample will be appropriately labeled and stored on ice from the time of collection <br /> ' through the time of delivery to the laboratory Ground water samples will be transported to the <br /> laboratory and analyzed within the EPA-specified holding times for the requested analyses <br /> 5.0 ANALYTICAL PROCEDURES <br /> ' Samples collected from the site will be submitted to state certified laboratory for analysis <br /> Samples will be analyzed for BTEX using EPA Method 8021 B, TPH as gasoline using EPA <br /> Method 8015 Modified, and oxygenate compounds using EPA Method 8260B <br /> 6 0 QUALITY ASSURANCE PLAN <br /> ' This section described the field and analytical procedures to be followed by ENSR throughout the <br /> investigation <br /> 6 1 General Sample Collection and Handling Procedures <br /> Proper collection and handling are essential to ensure the quality of a sample Each sample will <br /> be collected in the appropriate container, preserved correctly for the intended analysis and stored <br /> prior to analysis for no longer than the maximum allowable holding time Details on the <br /> procedures for collection and handling of sod samples form this project can be found in previous <br /> sections <br /> 6 2 Sample Identification and Chain-of-Custody Procedures <br /> Sample identification and chain-of-custody procedures ensure sample integrity and document <br /> sample possession from the time of collection to its ultimate disposal Each sample container <br /> ' submitted for analysis will have a label affixed to identify the job number, sampler, date and <br /> time of sample collection, and a sample number unique to that sample During soil sampling, <br />