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A Soil Boring Completion Procedures All soil borings are either properly abandoned or completed as a well 331 Abandonment Each soil boring that is not completed as a well is backfilled with bentonite grout, neat cement, concrete, or bentonite chips with a permeability less than that of the surrounding soils, and/or soil cuttings, depending on local regulatory requirements or client instructions Grout is placed by the tremie method Backfilling is performed carefully to avoid bridging The type of backfill material is noted on the soil boring log 3_2 Well Installation Wells are designed according to applicable state and local regulations as well as project needs Details of the well design and construction are recorded on the soil boring log and include the following minimum information(in addition to the items noted above for soil borings) • detailed drawing of well, • type of well (groundwater, vadose,or air spargmg), • casing diameter and material, • screen slot size, • well depth and screen length(:J= I foot), • filter pack material, size, and placement depths, • annular seal material and placement depths, • surface seal design/construction, • well location ((f 0 5 foot horizontal in State Plane and latitude and longitude coordinates and t0 01 foot vertical tied to the nearest vertical datum), • well development procedures Groundwater monitoring wells arc generally designed with 30 feet of slotted casing centered on the water table, unless site conditions, project needs, or local regulations dictate a diff—rent well design The sand pack is placed at least two feet above the top of the screen, and at least 3 feet of low permeability seal - material is placed between the sand pack and the surface seal The sand pack and low permeability seal material are placed in the annular space from the bottom up using the tremie method When drilling in asphalt, a 24-inch round cut is made for the well pad When drilling on concrete, a 2 x 2-foot square is saw cut The well cover is traffic-rated and has a white lid with a black triangle painted on it(3 inches per side) or a black lid with a white triangle(3 inches per side) The completed well pad should is concrete of . matching color with the existing surface The well number is labeled on the outside of the well box/pad and the inside of the well box The number on the outside is painted on with a stencil, stamped, or attached to Mam\D%nvironmental\ParmarTexaco\Reports\SAR1203 wpd