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PROPOSED aED WORK P#. ()N F ORT- E iiS A_LA i I O° OF '4 IJ MONITORING WELL FORWARD AhD'I " ? a SrO 7 _ , CA The following report is a work plan for the installation of , _. _...6•�! ground water iT}oP'}1t(„!°:°"1P`tt;€ wells at t h e Forward Landfill in i Stockton, CA. ..i..wo additional wells are proposed for the Forward Landfill to replace the broken °' W-2 and to add additional hydrologic informationin the vicinity of MW-5 The installation of these two wells will satisfy one of the closure requirements required by the Department of Health Services, that being the replacement of the inoperative MW-2 and relocation of its replacement well to r".'3 tYir„re strategic location an the dobJng3 t i f"Pt side of the l ,ndfilln it will also partly satisfy the DOHS closure condition of extending the depths of wells whi.ch are subject to drying during the summer months. ,Bf•'6 will abandoned M, ...°2 in accordance x:.,a`i.th the proper EPA abandonment procedures and install MW-2A approximately 370 f? - ` dfe.te north of the existing well . This 3"tew location i,s more directly d o$ n g rat h e n : o waste management unit A and, based !.`sn the current ground water flow nets collected over the last 5 months, will provide more representative C::t f'mF&EJ n g}'"ct Ci:1.e C€'t". ground water samples. ..i_h e second well , E l l u MW-5A, " : Ay will be installed nstalled between 25 a i d 5" fee " east of the existing MW- 5 and will be screened for 2_ f ety from 55 feet to 75 feet. i,s purpose of r t_ 4." ' is to screen the water table le da„=ep enough to collect gLLar..terl y ground water samples without :..:1.... well going dry, as is ::C°t e case '.i') MW-5. The wellwill he constructed to accommodate pump tests in the it1cifiitm`v` of MW-5 if the nC•°?eti sht;ii.tld arise in the future. The attached ._site map shows the old well locations and t:hi:;•a new proposed locations. The construction of PIW-511 Will be similar to the construction o f t t.. e previous w la on t{ t.h e site. T h i holes w i t .t. be drilled using a 10 inch hollow iii'°:.:em auger, large enough tt::.7 allow fCr placement of t 1 wwell rA _ iCg, T. e cuttings fr"o$Y} t tl{' drilling will be logged geologically by a staff geologist, however, :h . holes will n o " becored because tf vh close proximity to existing bt:::`"'eht3l es r""•ind t•::n{oitFg°} geology. f-ia5P_€r" inch schedule 40 PVC casing will be installed 4Ma:f.'t::t"} a . 01 :i.('St;;;i"} Howard Smith wire wrap screen rather t1an s::€ Johnson wire wrap s_?'"r°' #.e which had been previously used. The filter t::.iaC::k will be #30 fT}esh Monterey d - 5i, sized using the .i.dtMft•";;.a decision t:t ':k?„t„ As mentioned from above,. .:.._ well will_. .t. �?.._ screened ,..•___ ::,f::! ! ...s feet �:t"};'.� quarter inc bentonite ets will be tremied down the annulus and placed .. $ 'S depth of 50 t.o a feet for:r. d- e seal . Potable formation water will be used ..,',:or hydration of the t::3i::nE"._7f1it,e and mixing - f th e cement. r cement « i " t y "C " 4 > made if approximately