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J.`H. KLEINFELDER & ASSOCI,`t S <br /> .;une 13 , 1956 <br /> F,- -' e No. : PW86-1030 <br /> Page 3 <br /> above the screened interval . <br /> o A minimum of two feet of bentonite clay will be placed on <br /> top of the sand pack to preclude the infiltration of surface <br /> water into the well . <br /> o The remaining annulus above the clay sea! will be 'backfilled <br /> with a cement-bentonite slurry to grade . <br /> o A cast iron Christy Box cover will be installed flush at <br /> grade. <br /> Monitoring Well Development <br /> The wells will be developed using a combination of pumping, <br /> surging, and air lifting techniques until the water runs clear <br /> and is free of appreciable fines . <br /> Monitoring Well Sampling <br /> Each well will be purged by pumping until at least three <br /> bore volumes have been removed from the well . Temperature, PH, <br /> and conductivity readings will be taken periodically and <br /> monitored for stability as an indicator of sufficient purging. <br /> Once purging is completed, one sample will be collected from each <br /> well . To minimize cross contamination of samples , all equipment <br /> used to obtain samples will be thoroughly steam cleaned and <br /> rinsed with distilled water before the sampling of each well . <br /> Samples will be collected by bailing into appropriate <br /> containers specified by the analytical laboratory and immediately <br /> placed in iced containers. To ensure sample integrity, samples <br /> will be handled under strict chain of custody procedures. All <br /> field work described above will be performed under the direct <br /> supervision of a Kleinfelder geologist . <br /> Sample Analyses j <br /> A maximum of two soil samples and one water sample from <br /> each well will be submitted for analyses . The soil samples will <br /> consist of the last sample obtained before intersecting the water <br /> table and another sample to be selected on the basis of having <br /> the highest reading from our field vapor analyzer screening. <br /> Should none of the soil samples register on the vapor analyzer, <br /> only the soil sample directly above the water table will be <br /> submitted with the water sample . <br /> For initial screening we recommend that a total hydrocarbons <br /> analysis be run on both the water and soil samples using a <br />