ARCHIVED REPORTS XR0012566 - Laserfiche WebLink

Home Browse Search

� W ..n T'�".?PPaa��• .r A �` � �� • 'mss R i. . �� ,-�S�e m 'as'sxF'�—"a�__e,�ss�y3- ��.�5 -_ %-��• � -, � hf :ham _A � �x -/M �'l�w. � }. i }iLEItiFEL1)Eti o Based on the observed geologic conditions, the wells were screened with 2-inch inside diameter, flush threaded joint, schedule 40, ASThI F-480 PVC pipe with 0.020-inch factory-cut slots. o In general, the wells were screened from 5 feet above to 15 feet below first encountered ground water. o The annular space between the screen aad the wall of the boring was backfilled — with clean x112 Lonestar Industries Monterey sand to approximately 2 feet above the slotted sections. The annular space above the 2112 sand was then nilcd an additional foot with clean 0130 L.onestar Industries sand. This was done to prevent benioritc, pellets from leaching into the slotted screen. The screen and sand filter pack size were selected in the field based on the geologic conditions encountered in each boring. o A 3-foot bentonite plug was placed above the sand pack to provic'e a seal against cement/bentonite grout infiltration. -� o The remaining annular space was filled with cement/bentonite grout to the surface. The grout was inplaced under pressure through 1.25-inch diameter tremmie pipe. o Each well was secured inside a locking well cover. WATER LEVEL MEASUREMENTS Water level measurements were made in three monitoring wells located at the site. Measurement protocol was as follows: 1. The water level probe was decontaminated in a trisodium phosphate wash, �• followed by a distilled water rinse, prior to use in each well. 2. Water level measurements were made using a conductivity based water level indicator. Depth-to-water was measured from the north rim of the PVC well casing to the nearest 0.01 foot. FIS-91-62 Copyright 1991 Kleinfelder, Inc.