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The augers were removed in 15-foot sections and the inner annulus of the casing was alternately filled to the surface with cement grout to prevent caving of the surrounding formation Additional cement/bentonite grout was added to the well as appropriate as the casing was ' removed The well was completed in a traffic-rated utility box and fitted with a locking expandable cap. TABLE A-1 Well Construction Details MW-4 Total Depth 71 feet 407, 7�1 ' Screen Interval 50-70 feet Z'r"'! a ' Top of Sand 47 5 feet ,,z; r Bentonite Seal Interval 45.5-47.5 feat Casing Type PVC Schedule 40 Diameter of Casing 4 inch Sand Pack #1C Lonestar Sand Grout 3-5% bentonite and Portland I-II cement End Caps Flush-threaded screw-on bottom and expandable locking top Completion Flush Christy Box f 3 !i. ZG All measurements are in feet below ground surface {BGS} .f!, b C—C- IIS 2� , 7 Well Development After well installation was completed and the annular well seal had set for a minimum of 2� 31 hours, the well was developed. Initially, a pre-cleaned 3-inch-diameter bailer was used to remove fines which had accumulated in the well during construction After a majority of the ' fines were removed with the bailer, a 4-inch-diameter surge block was inserted into the well and used to surge the well screen interval approximately 20 times After the surge block was removed, the 3-inch bailer was used again to remove the fines that had entered the well during surging. The well was developed until fines were unnoticeable and the water was clear. Conductivity, pH, and temperature measurements were monitored and pumping continued until these parameters had stabilized. Parameters were considered stable when successive measurements were within 10 percent of each other. All development water was stored in 55- gallon drums pending results of the groundwater analyses. Well development data are included in Table A-2 of this report ' S XCNRffSMCMAD WP A - 5 1W12=