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10 November 2006 AGE-NC Project No: 01-0815 Page 5 of 5 .. Following-conipletion of the monitoring wells;well elevations and locations will be surveyed by a California-licensed surveyor relative to a City of Stock on elevation benchmark. 3.3.- WELL-DEVELOPMENT Development of the proposed well will consist ofa-co bination of bailing with a stainless steel bailer to remove the major portion of fine-graine'd-sedirneht from inside the well, surging to flush out or draw in sediment from the filter pack and additional ground water evacuation(purging)with a Waterra bailing pump to finish the removal of fine7'agrained sediment. Developmental purging activities will be continued until field parameter (pH electrical conductivity, and temperature) readings have stabilized and purged water,is visually s ,diment-free. 3A. 'GROUNDWATER SAMPLING PROCEDU S'. Water samples will be collected from-the monitoring well using a disposable polyethylene bailer or a dedicated teflon tubing used in conjunction with the inertia pump.The bailers are disposed of after one use and require no decontaminating and-the teflon ubing used-with the inertia pump is either dedicated to each well or changed at each sampling eve t, thereby minimizing cross contamination due to sampling devices. Samples will be drawn and cc llected in such'a manner that agitation and exposure of the groundwater to the atmosphere is minimal Ground water-samples will be collected into.laboratory' upplied containers. Ground water samples and three 40-m1 volatile or_amc an sis VOA ,Vials without preservative. Following-liter amber bottle . to be analyzed for TPH-g,'TPH=d,BTEX,and MTBE will be collected into one 1-lit ...,.•..,, g _Y (�--_) p wing collection, the samples will be placed,on ice and-kept in a cooler witil delivered to the laboratory for.ahalysis Chain-of=custody protocols will.be used to document sample custody transfer from the field to the. analytical.laboratory. A chain-of-custody form will acc. mpany the samples. 3.5: EQUIPMENT DECONTAmINATIONIWAST MANAGEMENT. All sampling tools used for sample collection will be thoroughly rinsed with clean water after being washed with a solution ofAlconox.All down-hole.drilli ig,equipment will be pressure washed prior to starting each boring:Cuttings generated during drilling and rinseate generated during drilling and groundwater sampling activities will be containerized irk properly labeled DOT-approved 55-gallon drums, and.stored on-site in an area lacking public access. Disposal alternatives will be evaluated basedon results of soil and water analysis.' AdvangW GeoEnvironmental,Inc.