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Groundwater Well Installation Standard Operating Procedure SWE-FSOP-601;Revision 1 Ahtna Southwest Environmental Operations turbidity fluctuations because there is no filter pack. Take care not to disturb the casing during purging and sampling. 2. Traditional Filter Pack. The screen and casing are inserted into the borehole, and the sand is poured into the annular space surrounding the screen and casing. Note: Occasionally, it may be difficult to effectively place a filter pack around shallow open boreholes due to collapse. This method requires more sand than the "inner filter pack."As the filter pack is placed, it mixes with the muddy water in the borehole, which may increase the amount of time needed to purge the well to an acceptable level of turbidity. 3. Well-in-a-Well.The borehole is advanced to the desired depth.A 1-inch well screen and sufficient riser are inserted into a 2-inch well screen with sufficient riser and then centered. Filter pack material is then placed into the annular space surrounding the 1-inch well screen, approximately 6 inches above the screen.The assembled well is then inserted into the borehole. Temporary wells are commonly used for short periods(days/weeks)and should be decommissioned when no longer needed. See FSOP-603 Well Decommissioning for procedures. 4.5 Demobilization/Site Restoration All debris generated by the drilling operation/well construction should be disposed of appropriately.The site should be cleaned, the ground washed as necessary, and the site conditions restored as per the project work plans. All monitoring wells should finish their surface completions as per the project work plans. Any hazards remaining due to drilling activities should be identified, and appropriate barriers and markers should be put in place,as per the APP.All soil cuttings and fluids should be adequately contained, clearly labeled, and maintained to comply with the project work plans. 5.0 Quality Assurance/Quality Control Conduct the 3-Phases of Quality Control Method described in the project work plans. Quality Assurance (QA) and Quality Control (QC) procedures for well installation field documentation review will be performed by the FTL or PL to check that procedures and documentation content and level of detail comply with this SOP. If a deficiency or a variance was taken to the SOP,the PL should document the deficiency/variance and determine the need for corrective action in coordination with the QA Manager. If a non-registered geologist performs the oversight, a registered Project Geologist is responsible for reviewing the fieldwork documentation for the accurate and complete representation of the drilling and approval of final logs/forms. 6.0 Documentation Review The FTL is responsible for the daily review of the fieldwork documentation for compliance with requirements (Section 4.0) and legibility. Errors and omissions should be explained and revisions to an entry signed and dated by the FTL. The PL is responsible for the review and signoff of final approved documents stored in the project file. Page 15 of 16