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APPENDIX <br /> FIELD PROCEDURES <br /> Page 2 <br /> annulus above the bentonite seal Each well will be completed with a locking well cap and a <br /> traffic rated man-hole cover A well construction diagram is shown on Plate 5 The wells will <br /> be constructed under the supervision of a California Registered Geologist <br /> Monitoring Well Development, Purging and Sampling <br /> At least 24 hours after construction of the new wells, water levels will be measured with an <br /> electronic well sounder and the wells checked for free product using a clear bailer The wells <br /> will then be developed using a vented surge block Approximately three to five well volumes of <br /> water will be removed with a submersible pump until temperature, pH and conductivity readings <br /> stabilized and/or the water cleared of sediment Water samples will then be collected by <br /> lowering new polyethylene disposable bailers into the wells Water from the bailers will be <br /> decanted directly Into appropriate sample containers All samples will be preserved on ice and <br /> selected samples submitted with chain-of-custody documentation to a California-certified <br /> laboratory for analyses of TPH, using modified EPA test method 8015 and BTEX, using EPA <br /> test method 602 A travel blank prepared by the analytical laboratory also will be analyzed for <br /> any compounds detected <br /> Pumping equipment will be cleaned prior to use in each well with a solution of trisodium <br /> phosphate and distilled water to minimize the potential for cross contamination All water <br /> removed during purging operations will be stored on the subject property in sealed and labeled <br /> 55-gallon drums <br /> `�A <br /> bVAL!_ACE•KUHL <br /> R "'a &ASSOCIATES INC <br />