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1 • <br /> October 1, 2004 <br /> NOA Project Number: LE03-034 <br /> ' 3.2 Well Materials <br /> We recommend that the ground water monitoring wells be constructed with the following materials: <br /> Casing Matenal=Schedule 40 Polyvinylchloride (PVC) <br /> ' Casing Inside Diameter= 2 inches <br /> Casing Outside Diameter= 2.3 inches <br /> Top and Bottom Casing Caps= Schedule 40 PVC. <br /> Casing Perforations= Slot Cut No 10 (0.010 inches) <br /> Sand Pack =L.onestar Sand No. 3 <br /> Annular seal thickness= 2.1 inches <br /> ' Surface Sanitary Seal= Cement-Bentonite grout mixture (5 peroent bentonite by Weight) <br /> Security Locking Top = 8-inch diameter, orange painted, steel pipe with locking top <br /> Barricade Poles = 6-inch diameterpipe(3 each)placed in concrete grout 3 feet belowground and 3 feet above ground <br /> surrounding the monitoring well in a 4 foot diameter circle. <br /> A neat cement-bentonite grout mixture with up to 5 percent bentonite by weight will be used for the <br /> annular seal. According to two well casing distributors, the PVC schedule 40 casing should not be <br /> affected by the resulting heat generated by the cement grout mix. Mr. Garret Hubbard, Geotechnical <br /> Engineer at Neil O.Anderson&Associates, Inc. of our Lodi, California office indicated it is his <br /> experience that the grout temperature will probably not exceed 95 degrees F. and should not cause <br /> damage to the 2 inch diameter Schedule 40 PVC well casing. <br /> ' 4.0 WELL DEVELOPMENT <br /> Well development will take place a minimum of 24 hours or later after the well has been grouted. <br /> ' We recommend that the monitoring wells be developed using the following procedures: <br /> 4.1 Decontamination Procedures <br /> The well drilling and sampling equipment will be decontaminated prior to drilling and installation of <br /> each proposed monitoring well. The decontamination procedures are described next. <br /> 1) The drill rods and bits will be steam cleaned prior to drilling and installation of <br /> the monitoring well materials. <br /> 2) Equipment that cannot be steam cleaned will be decontaminated by washing with <br /> a solution of potable water and Liquid-Nox solution or equivalent. <br /> 3) Gloves and other protective clothing will be containerized for offsite disposal at a <br /> licensed sanitary landfill,if deemed necessary. <br /> ' 6 '--44 <br />