ARCHIVED REPORTS XR0012563 - Laserfiche WebLink

Home Browse Search

4WA IR I.4 4lorsitar4n weft Crsvef Fack end Sio[ Size Seiertio Tho size of the gravel pack that were placed adjacent to the well screen wdl be determined by the project manager based on an estimation of the grain size distribution of the formation within the uppermost saturated zone at the site. Available geologic infor=tfon was utilized in the selection of this grain size. The gravel pack was selected soca that it will Pcnmit the her hydrautic crinductivity adjacent to the well screen but will of tilow piping lof the finer-grained formopment of a zone Of attion into the Well bore. The slot size,of the well screen was selected such that it will retain a minimum of 95 Pere:nt of the gravel pack material. I—.Mahle H-o Weli Devetn merit After monitoring wells were installed,each monitoring well was developed after construction with a L75- inch-diameter manual pump until the water produced was refativeiy sediment-tree or until measurementsof PK specific conductance, and temperature stabilized, if the well was development process, recharge rates well bechemicals P�pd dry during the were introduc into hmenL Alwaterwas placed in drums and Lord on site monitoring - ells during well devclo ed for later disposal. __ tsnd water m !ln A minimum of 24 hours following well development.and after water levels had been allowed to stabilize in each we-i, three to five wetted casing volumes of liquid was removed a laboratory-cleaned teflon nailer. Measurements of from each well lxy bailing with made at regular intervals during this procedure. Removal specific conductance, each ,ed temperature rwas COnoicontinued "nom had been the measurement H, specific pecific caaductance, and temperature had stabilited. A liquid samp.a was then coltzetcd from each well with a new,disposable tellon batter. Each sample was appropriately stored on ice flora the time of collection through the time of delivery o the la,oratory, Gro d water samples were transported to the laboratory and analyzed within the EPA-specified holding times for the requested malysm 7 1'etrnleum Product If fret- petroleum product .,ms present in a well, the thickness of the product layer ✓Yrs measured by application of a productMater interface probe. A sample of the product was collected with a laboratory- cleaned teflon bailer and transferred to an appropriate sample conrainer and subsequently'submitted to a .California-certified laboratory for fuel fingerprint analysis.