FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

N%.Wl 11� plsty to isolate the perforated interval from cementing operations . The upper portion of the well Will be cemented from the bentoriite plug to the surface with cement grout, using direct displacement and/or a tromie pipe if weeded. The monitoring weals will be completed using a protective box at the ,surface, cemented in place. with a rdmovable cover. The pipe top will be capped with a locking cap for protection. During baring operations, all cutting will be described by a registered geologist. Samples will be taken every 5 ` , comm- encing at 5 ` below ground level . This will ensure that the entire vadose zone, which has contained water at any time in recent years , will be sampled and tested. Samples will be collected using a 2" split spoon sampler with 2" X 4" (or similar) brass collection tubes . Duplicate samples 'will be provided for EliD/RWQCB if desired. The soil samples will be examined and described. The collected samples will be capped +pith foil , sealed with plastic end caps and duct tape, lab- eled and placed in an ice chest for transportation to a cer- tified laboratory. Chain--of-custody forms will be used for transferal of samples and their temperature will be measured when received at the lab. All sampling equipment will either be obtained as a package from a certified lab or brought to the site by laboratory personnel . A copy of the laboratory QA/QC manual will be supplied with :.he sample results. All borehole equipment will be cleaned between wells and at other appropriate times with a three step wash and rinse process using either TSP or a similar industrial cleaner. At a convenient time after the wells are installed, standing water levels will be recorded using an electric probe type water and product level recorder, both in the monitoring wells and the current water well . The well heads elevations, at least with respect to each other, will be surveyed ire order to establish accurate well head elevations . The wells will be developed by bailing at least 5 casing volumes of the standing water column, using an appropriate size PVC bailer with a either a Teflon or similar ball and seat . When the water level has returned to about 3/4 of its standing level , bailer samples will be taken. The bailer will be cleansed as noted above between uses in each well . All samples will be collected in sterile jars and vials ouppl i.ed by the testing lab_ Chain-of--Custody forms , ice chest_-{ e{,c , as noted above will be uw.ed. The laboratory will be instructed to supply both sample blanks and duplicate r�ontztinevs for -Like s-a.mples .if, needed . The rmethodz used for itratio and equipment calibration will be 41escri bed in the l;:arat�zs 1, m �raua l . F,] 1 :;a rnple , ;oti-, soil and wate..: . ori. 11. be teste'. for BTEY 4=H -+ Tawe _ ,;Lb( r at try wi 1 1 in4t.ruL:ted to use the