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;� _ P n,.- _ .�4�� -.d„��' i. -•;.s,--?^ c..�...t' ?.F-�s�``'�a �r�.,�y�.�sn �� .�"s.'��—.1su'ls�.�. � �-:..•�: � `r-','r.�y `��- Win, -^�:��-'a. �.y.»-,.,_.. y,:' .r��,.�. - .s., .�•a1. .=y,�.�� Z -.:?:rx:• �+ ,��,'k c., .�„.., a�'+s.:Ce.. �.�:.rs:..°s,.� a:s' -�. '��`r_� �P .� �f Vd'ax� r_scasl�y�F' �,a'.srr�«-.� �7-Yr„S�.a:"'��"';f:. -'�'x+ i'4-::� °Ly*. :x-' � { t,� �x.», .t. q%^".,-,*�,. F;: � �+ ..�'�kM, r.�.. .r.�',_�p.�.�'" ,�. 'a.5°�' ;�".L,.r �„�- .f,��.� m�:�". ,.f•,... �S�w�=�-.., -}"�, .�-, �=%1W y;i a. _yA ^P t -�Arz t: stt: rt � Ct: ul. c� t� tr3Zt: sc� t: ltct, s , � tic: . - 4 M110N1T[}R WELL IPtS'1'Al.[.AT1QN AND AEVEI.OPAZF.*1'1' t= -- The WGR standard operating procedure for monitor well installation and development is included zs Appendix C. Boring B-10 was compacted as well MW-4 on 28 September 1989. Monitor ll well MW-4 was const ucted with 14 ft of Screen A set at the bottom,to a depth of below grade. We Appendix construction details ale included on the boring log for monitor well MW-4 in Appendix B. r., •a; The generalized hydrogeologic cross-sections in Figures 4 and 5 show boring B 10 (MW-4) termin a low-estimated permeability bottom confining zone,and well MW-4 screened across a iaatc:l water-bearing�onc of alternating low-,medium-,and high-estimated permeability soil. Well MW-4 was .� screened 4 ft above static water to allow for seasonal Nater table fluctuations. J L yt on :Monitor well MW-4 was developed on 2[}ctober 1989 by WGR technicians Michael Parkinson and Randall Smith until relatively clean, silt-free water was produced. Development was performed using airlift and surge block techniques. Well MW-4 produced about 1 gallon-per-minute. Fifty-eight . gallons of groundwater, evacuated during development, were stored temporarily on-site in 55 gallon drums pending znalytic results. ERR -�w 5 a