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Section No 6 <br /> Revision No. 1 <br /> Date January 13, 1992 <br /> Page 41 of 55 <br /> The filter pack material will extend no less than 2 feet above the well <br /> screen to allow for compaction of the filter pack over time Following <br /> installation, the top of the filter pack will be carefully measured and <br /> recorded The actual volume of material installed will be checked against <br /> the calculated volume to ensure that there are no voids or slough intervals <br /> within the filter pack The final level and volume of filter pack material <br /> used will be recorded in the well construction log <br /> 6 7 4 Well Seal Material and Placement <br /> The remaining annular space above the bentonite seal will be backfilled <br /> with grout materials in all monitoring wells The type of grout materials to <br /> be used will be specified in the Work Plan for each given task Prior to <br /> grouting, the appropriate regulatory agency will be notified in advance of <br /> the work The depth of the annular space above the bentonite seal will be <br /> carefully measured to determine the volume of grout required Grouting will <br /> be completed in one continuous operation in which the annular space is <br /> filled Where pours exceed 100 feet in depth, the collapse strength of the <br /> casing will be checked prior to grouting The annular space will be <br /> backfilled from the bottom of the annular space upward using pressure <br /> grouting techniques in accordance with State of California Water Well <br /> Standards, Bulletin 74-90, January 1990 The grout materials selected will <br /> conform to paragraphs D 2 and D 3, Section 9 of the Water Well Standards <br /> The grout seal will extend from the top of the bentonite seal to land <br /> 40 surface Following the grouting operation, the volume of grout used will be <br /> checked against the theoretical volume to ensure no gaps or voids within the <br /> 6-41 <br />