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E <br /> t <br /> or surged to settle the Filter pact;. and metre sand viii be addr.d as necessary_ to return the ievei <br /> to a hetght of 2 fee[ above the too of Elie screen. A 2- to 3-r(x)t-tinick seal of bentonite peilrts <br /> will be placed above the sand pack. The «'ell '•4'llI then be -Toutvd -ith bentonae-cement slum' <br /> or neat cement. from tate top Of the bentonite seal to the surface. it wiil be completed below <br /> ,rade and protected with a water-tight locking cover, <br /> The County requires that eraundwater samples collected from monitoring wells. which are. <br /> located within SQ feet of a sanitary s�t�°5�4yer iitn vzed for(a corciingltooF Figure f al[he sampleny of the s from <br /> sed <br /> wells are located within 50 f <br /> this well will be sampled for this constituent. <br /> Property Owner Approval of Well Locations <br /> The owners of the properties where the five monitoring wells are proposed will be contacted <br /> and approval obtained prior to the Weil installation. The wells located in the public right-Of-wav <br /> are on City of Tracv property and a permit to install the wells will be obtained from rite City of <br /> Tracy. Permission to ins[a1k the wells located on private property will be obtained from the <br /> e properly owners and a license agreement between ARCO and the property owners will be <br /> obtained prior to commencing work. <br /> In the event that the City of Tracy denies permission to install monitoring wells on its <br /> property, ARCO will try to obtain approval to install each monitoring well on the private <br /> property closest to its presently proposed location. <br /> Monitoring Well Installation <br /> i <br /> A maximum of five monitoring wells will be installed off site:around ARCO Station 2093. <br /> The borings will be drilled to a depth of 15 feet below first groundwater. Groundwater is <br /> estimated to be approximately 10 feet below ground surface; therefore, the total depth of each <br /> roxin,ately 25 feet. After completion, each well will be developed. <br /> monitoring well will be app <br /> well drilling and completion,well development,and soil sampling <br /> Th:procedures for monitoring <br /> are described in Appendix A. <br /> After development, the groundwater in each well will be sampled and analyzed for total <br /> petroleum hydrocarbons; benzene, ethenzene, toluene, and xylenes; a d 1,2-DCA. A <br /> description of the groundwater samplingprocedures is included in App <br /> Soil and Groundwater Disposal <br /> The soil generated during borehole drilling will be temporarily stored <br /> n site <br /> sample means: <br /> - - - -plastic sheeting pending laboratory-analysis_of a composite same (composite <br /> collection aE samples from four discrete ]orations per 50 cubic yards of stockpile soil and en-- - <br /> compositing in the laboratory for one analysis)collected from the stockpiled soil. The stockpiled <br /> soil will be disposed of in an approved waste disposal facility after laboratory results are <br /> nerated from the development of the wells will be temporarily <br /> received. The groundwater ge <br />