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' 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 Material=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 =Lonestar Sand No. 3 <br /> Annular seal thickness= 2.1 inches <br /> ' Surface Sanitary Seal= Cement-Bentonite grout mixture (5 percent bentonite by weight) <br /> Security Locking Top = 8-inch diameter, orange painted, steelpipe with locking top <br /> Barricade Poles= 6-inch diameterpipe (3 each)placed in concretegrout 3 feet belowground and 3 feet aboveground <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 '-044 <br />