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We propose using 2-inch PVC casing to complete these monitoring wells. <br /> This is installation technique is suitable for long term ground water <br /> monitoring use for the following reasons: <br /> • the completion details will meet County and State installation <br /> requirements, <br /> • intake lengths will be short and discrete, <br /> • seal materials will consist of 10 foot surface seal of neat cement <br /> and concrete, <br /> • bentonite chips will be used to isolate intake intervals, <br /> Only one intake interval will be designed based on borehole geology and <br /> existing monitoring well information. The intake screen for ground water <br /> monitoring intervals may be positioned at depths exceeding 30 feet <br /> depending on borehole geology. The combined screen and sand intervals <br /> will be considered the well intake interval. The well installation detail <br /> form is provided as Attachment 1. <br /> Existing monitoring wells will be used. MW-1, located to the north,will <br /> be used for ground water sampling, and MW-2 will be used for water <br /> levels only. <br /> Drilling and Installation <br /> Drilling and Installation will be completed by local driller with a <br /> California License. A hollow-stem auger drilling technique with an <br /> outside diameter of 8 inches will be used complete the borehole to the <br /> desired depth. Continuous core samples will be collected and logged by a <br /> California registered geologist. The Unified Soil Classification System will <br /> be used to log the borehole soils. Based on the borehole geology,well <br /> intake zones will be finalized. <br /> California Concentrates Monitoring Well Work Plan Issued: June 8,2001 <br /> Revision 1 <br /> JHC Project No.493-01 <br /> 4 <br />