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I <br /> -. A-2 <br /> 1A Monitoring Well Gravel pack and Slot S ze Seleciloil <br /> The gravel pack will be selected such.that it will permit the development of a zone of higher hydraulic <br /> conductivity adjacent to the well scree:I but will not glow piping of the finer-grained formation into the well <br /> bore. The slot size of thy well screen will be selected such that it will retain a minimum of 95 percent of <br /> the gravel pack material. <br /> LS Monitorina Well Development <br /> After mi-nitoring wells are installed,each monitoring well will be dmcloped by removing 3-3 wetted casing <br /> volumes of ground water by bailing or pumping. If the well yield is lorV; surging will be used as an <br /> alternative to bailing or pumping,but a minimum of I-1/2 well volumes will still be removed. No water or <br /> chemicals will be introduced into the monitoring wells during well development. All developed water will <br /> be placed in drums or site fog later disposal. <br /> 1.6 Graund Water Sam Irl Y;a:. <br /> Three to five wetted casing volumes of liquid will be removed from each weal Lw bailing or pumping with <br /> ' a clean disp ble bailer. A liquid sample will then be collected from each well with a cleaned disposable <br /> bailer, Each sample will be appropriately labeled and stored on ice from the time of collection through the <br /> time o°delivery to the laboratory. Ground water samples will be transported to the laboratory and analyzed <br /> within the EPA-specified holding times for the requested analyses. <br /> 1.7 Uguld Phase I3Yurocurbons <br /> If liquid phase hydrocarbons(LPH)are present in a well,the ttd6mess of Oe LPH layer w:11 be measured <br /> 1; <br /> by collecting a sample in a transparent disposable bailer with a check valve at the bottoms or by <br /> measurement using appropriate fluid-level sounding equipment. <br /> 2.0 ANALVnCAL PROCIEDURFS` <br /> Selected s:.il samples and ground water samples submitted to the laboratory will be analyzed for BTEX and <br /> TPH as gasoline tying EPA Method 801518(r.O. Ground water samples submitted to the laboratory will be <br /> - .-- —_---'--__--_-.—_analyzed for-the.same_constituents as the-sail samples._-- --.-_.-- --.----- ---_- ----__--- ---------------- -- ._--..— <br /> f1 , <br />