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APR-05-04 MON 12130 PMELL NELSON SCHRIMP FAX NO, 2V26-9320 P. 13 12/o.i/8cii� 17:11 F:S 20f� tJf w�:t tFJV1'1 k% KLEINFELDER a A 3- to 5-foot bentonit', plus is placed above the rwid pack to provide a seal against surfssc water infiltration and to reduce the potential for eemeut groat to Ifiltate into the water, • Tho rexainine a-InuJar space is filled to the surface with cemenLfbentonite gout. The wells are,secured in an aboveground or underground locking stovepipe, The well heads may be enclosed in a water tight cement utility box sot flush to rhe Found surface, when located in a traffic area. R-12 Monitoring Well Development The wells are developed to reduce the effects of drilling on the formation and to increase the effective hydraulic radius of the wells, 11 Moritotinig wells are generally developed 24 to 48 hours atter installation to allow the gout to set. Each weft is first sampled with a clew; disposable bailer to visually inspect for a hydrocarbon layor or sheen. If no product layer or sheen is obaorved on tho water, the well is developed by surg ng, pumping or bailing. Surging along the screened interval of the well is performed to draw the sediment reom the formation into the filter pack and the well, and to set the sand pack. Development contirtues until the discharge runs relatively clear of fines, Apptoxlmately 5 to 10 well volumes are generally removed from each monitoring well. Discharge water is storerl in 55-gallon drums and left on site for later discharge or disposal by The client, dcpcnding on laboratory results. Ilia drams are labeled with the date, well number, and a contact person and phone number. 8-3.3 Equipment Decontamination To reduce the potential for cross-contamination between walls,developing equipment is washed in a trisodium phosphate or non-phosphata detergent sclution and rinsed hi distilled water or steam cleaned prior to use in the next nronitnrinr-,well. B-3.4 Wall Survey M%i loc-'tions of Sc.l Lorivas and monitorin; wells, and the elevation of the top of thc; PVC, casings are usually sarveyed and tied into pomra7cnt mart---Ta, if readily available. Survey accuracy is O.l loot for dee "x" and coordinates and ,01 foot for the "Z" coordinate. The; 7101 PRCP F.V Je,'TOiP 133 L�cee_to i,2W3 Peg;v of ix 046", fUemre:d-r,Inc.