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f ; Part 11. Monitoring Well Construction Section 8. Well location With Respect to Pullutantt and Contaminants, and Structures. Monitoring wells are usually constructed to observe conditions'at defined nr required locations. [Monitoring well locations atc usually s-Ole t%:,d on the'basis of known or cxpected hydrologic, geologic, and water quality conditions and the location nr pol[ulaw or cnnaamimint sources. Mnniloring wells frequently need to be lcxt,itW close to or v►Zthin areas of pollution or contamination. A- Separation. Monitoring wells &hall be loc:acd :irl adequate disrance from known or potential sources of pollution and contarnination, Including thaw; listed in Section 8 or the Water Well SwridaMs, unless regulatory nr legiUrnaLe data requirements necessitate they be locale d closer. I B. nooding and Dra[nag_ Monitoring wclis-shoazlel bkc located in areas prolWecl from fl[xnd1ng, if possible. Provisions for locating monitoring wells in areas of flooding and drainage are e'Gnwirtcd in Section 8 of the Water Well Standards, i I C. Acrc;s ibilitr. All monitoring wells shall be located an adequate distance frorn buildings and other structures to allow acccs5, ffir wc;ll maintCr(taraM mc)diflotion, repair, arid dcgtrucrion, unl s-otherwise approved by the enforcing agency. D, Dispgsal_af Wastes When Drilling in Conlaminatcd ()r Polluted Areas. Drill cuttings and wasac:walcr fTern monitoring wells or exploration hales in areas of known or sea>pi:cicd conzarninaticin or pnllaa[ion shall lre disposed of in accor&mcc%.-I aaII �ipplit:ah3e federal,State, and local requirements. The enforcing agency should be,contacted to determine requirenicnls for the pauper disposal of cuttings and wastewater. i f Section 9. Scaling the Upper Annular %pace. The; space between the monitoring wcl[ c�s[ttg and the w;a]] caf the* will Mring, usually referred to as the "annular space," shall be effectively sealed to prevent it from being a preferential pathway for the movement of poor quality water, pollutants, and contarnxn:ant.!�. Since: TROAUcrring wells are ()flc:n constructed Ln obtain water Rom discrete intervals, a secondary purpose of the annular seal can be to isnlate the well intake section or screen to one water-heariNg unit. Then annular seal Van also serve to protect the structural inle;grity of the well casing and to protect the rasing from chcemlcd anack and corrosion. Btxauso monitoring wc]]s are often located close tea, or within area-% affected Jry pollutants and cantarninunts, an cffcctivc. annular sell is often critical for the: protection of ground water quality_ General dkcassiora of scaling methods and requirements for rranraitoring wells is contained in Section 9, Sutton 13,and Appendix B. of the Water Well Standards. Spedal requirements for monitoring wells include the folluxv ing: A. Minimum T)crth uF Annular Sea]. a 1. VJatcr q tw1i ly monito ring we]ls and monitnjn .wells cons tructed_i.n_areas of known ex suspected pollution tar con Intniriaticrn, The annular spacc shall be sc-sled from ibe trapr of the filter pack or monitoring none to ground surface, ur[less otherwise approved by the e.nrnrcing ages . 'TILe top of thu filter pace or monitoring zone shall not exterld into another water-bearing unit above the single water-bearing unit being monitored unless utherwise approved by ilrc enforcing agency. The Filter pack or monitoring zone shall 1101 exlcrnd into any confining layers that overlie or underlie the unit to be moni- -41_