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i i & Overpurnping and Fume Sure, rpumjAng and surging may not be suitabic for €Ievelop- nient of wells prods sing large amounts of sediment bt?causc of the putential for clogging or jamming of pumps, C, Air Devetorrmen1. Some air develop inent methods are not acceptable for monitoring wells to be 1ascd for scnsi?Ive.water-quality deicr€niriaEions. 13. Waler Je l Iffi. W jlor Used in jetting operdIions sha11 be free of polIuta0t& and CORmminants, Water-jeuingjeuing methods are not always acreptabl:c for monitoring wells used for sensitive: waFcr- qu5liiy &te rmina E ions. E. Chemical.Develop€ne.nt.. Extrerne care shall be exercised in the use of chemicals for morlitori€ag well devi:1opment. It is often unacceptable to use ehernicals for clevL.oiling mf)ni€*ring wells €o be tiFW for water-gaality docrminai ions. Chemicals lntrodi tied for development shall be ceample;tely removed from the well, filter paiA, and water-bearing strata accessed by the: well irmediately after development operutinns arc completed. The various methods described above are �;1�mtuirnes used in cornbimnion_ Section 14. Rehabilitation and Repair of Monitoring Wells. G For the purpose of these standards, "well rebabilitarion' includes the treatment of a well to recover lass in yield Cousin by incrustation or clogging of Elie screen, Filter pack, andlor water-b-varing strata €adjoinang the we-ll. Well rehabiiitatinn methods that m4y, in ci:rliain roses, be acd:gplable, For monitoring wells include m"hanic3l surging, back-washing or surging by altcrnptcly starting or s€upping a pxinip, surging with air,water jetting, sonic elcaning, chemical treatment, or combinations of these. Rehabilitation methods shall be performed wills care to prcvc;nI damage to the well-clad any barrlers that serve [o restrict ilic movement of poor-duality waxer, pol1alanis,or coiltaini nail ts_ Chemicals used for rch ibilil a Zion shall be Completely ramuved from the well, filter pack, and water-bearing strata aeuc sed by the well immediately after mbabil nation op�:rations ar€:cornplctcd. Chemicals,water,and oEher waste shall be disposed of in accordance, with applicable federal, State, and loot requ{rernerits_ 'nie enforcing agency should be cos,:€acted ri:garding the prosper disposal of waste from- rehabilitation operations. Rehabilitation methods should be, compatible with the use; of the: rnnnRoring well. Special care shoiAld be given to the scW.fian of rchabilitxtion. methods For water-quality monitoring wells. Materials used for repairing well casing shall meet the rcyuircrreunEs of Section 12 rnf these standards. Section 15. Temporary Cover_ The well or h*rehole opcning and any associated excavations sliall he covered at the surface to ensure public safety and to prevent the entry of foreign Tnaterizil, water, contaminants, and pollutants whcriaver work is interrupted by such even:Lq as overnight sh utdown, poor weii ther,and re:quirc d wxiiing periods to allnw sett ing of sealing materials and the performance of tests. They cnvcr shalt be held ire place or weighted down in such a manner that it cannot he rcmc�Ved cxr�epl by Nuipment or tools. I I -49- h