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it <br /> • 35 feet, <br /> 42 feet, <br /> • 51 feet, <br /> 56 feet, and <br /> • 60 feet. <br /> 3.4 Laboratory Analysis <br /> Chemical analyses of soil and water samples will be made by a State of California DOHS <br /> ELAP-certified laboratory. The samples will be analyzed -for TPH-G, Benzene, Toluene, <br /> Ethyl benzene and xylenes (BTEX) constituents under EPA methods 8015 (modified) and 8020, <br /> in series. In addition, the samples will be analyzed for fuel oxygenates TAME, DIPS, ETBE, <br /> MTBE, TBA, EDB and 1,2-DCA, using EPA method 8260B. <br /> 3.5 Monitoring Well Construction <br /> Shaw will construct the monitoring well through a metal conductor casing that will be . <br /> permanently set to 54 feet bsg. The casing will be cemented into place to ensure that there is no <br /> potential for the vertical migration of groundwater within the well structure or within any vertical <br /> pathway created by construction of the well. The casing will be placed within a <br /> 12-inch-diameter or greater borehole. Jax,0� <br /> c fit` c y„vvsf c <br /> The initial boring will be made using auger or other drill method. The conductor casing will be <br /> lowered into it and the casing will be effectively centered within the borehole. A <br /> mechanically-mixed cement-bentonite grout will be placed, by tremmie pipe into the annular <br /> space surrounding the conductor casing. The annular space will be filled from the bottom up to <br /> near the ground surface with slurry. <br /> No sooner than 24 hours after placement of the annular-spade grout, drilling and construction of u <br /> the final well bore will begin. A hollow-stem auger or other method will be used to drill a <br /> 6- 5/8-inch or greater diameter hole into the earth at the bottom of the cased borehole. This <br /> boring will be extended to approximately 60 feet bgs. The completed monitoring well will be <br /> 2-inch-diameter, drilled within a 6� /8-inch nominal diameter boring that will be made through <br /> the previously installed conductor casing. The well will be finished below grade in a <br /> ,,,�12-inch-diameter traffic-rated box with a locking lid. Com` ` <br /> A two-inchhdiameter Schedule 80 PVC well string will be lowered to 60 feet. Centralizers will <br /> be used to keep the well string straight sufficiently plumb and centered enough that the sand pack <br /> can be evenly distributed arou�d it. The well string will consist of flush-threaded <br /> ASTM-conformable bottom cap, 5-foot-46gth of factory-slotted screen, and unperforated(blank) <br /> S-DP-N.isa IDM20051 01 01880040IA5acWPParkinson.doc 3-2 <br /> �� 96.05 r <br />