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FINAL • DDRW- arpe Well Installation Work Plan development, and the average pumping rate identified as being essential to ongoing DDRW- during development. Sharpe programs. 5.2 Groundwater Sampling and 7.0 MONITORING WELL Analysis ABANDONMENT Groundwater sampling will occur two weeks 7.1 Tables 7-la and 7-lb presents the after monitoring well development.The construction specifications for the 37 appropriate groundwater sample analyses will monitoring, extraction, and dewatering wells be determined after well installation and recommended for abandonment during this field submitted to the contracting officer for effort (on- and off-installation, respectively). approval. All sampling should be performed in The wells will be abandoned by filling the well accordance with the procedures outlined in the with bentonite-cement grout using procedures Comprehensive Field Work Plan. required under the California Administrative Rules of Water Well Drillers and Article 56 of 5.3 Well Location SurveVing EPA 57019-75-0001 and those outlined in the Comprehensive Field Work Plan. Coordinates and elevations will be established for the brass marker on the top of the concrete 7.2 All wells will be inspected prior to pad of each monitoring well or piezometer.Top abandonment to determine the condition and of casing elevation will also be determined. verify the details of construction. All abandon- Horizontal coordinates will be determined to the ment procedures will be performed in closest 1.0-foot and referenced to the State accordance with federal, state, and county Plane Coordinate System,Zone 3,North regulations in order to assure quality of the American Datum of 1983, feet. Ground and top groundwater is protected and possible physical of casing elevations to the closest 0.1-foot and hazard to humans is eliminated. 0.01-foot, respectively will be obtained at each well.These elevations should be referenced to 8.0 MONITORING WELL the National Geodetic Vertical Datum of 1988. . MAINTENANCE 6.0 SURVEYING OF EXISTING During a wrap-up meeting held after the WELLS completion of the First Quarter 1996 Well - Monitoring Program, a recommendation for A total of 72(active and abandoned) archived maintenance of 133 existing monitoring wells and abandoned monitoring,extraction, and was made.The maintenance requirements for potable water wells have missing survey each well is presented in Attachments 3a and 3b. information and will be resurveyed during this field effort.The three groundwater treatment 9.0 INJECTION WELLS plants,four canals and sloughs, and other EVALUATION existing landmarks will also be surveyed. Attachment 1 lists those wells and other 9.1 The Central Area Groundwater Treatment landmarks requiring location surveying Plant is designed to treat 750 gallons per minute according to the procedures described in Section (gpm) of groundwater and return the treated 5.3. Attachment 2 lists wells with missing groundwater to the source aquifer through ten information that will be obtained using Global injection wells. Five wells are for injection into Positioning System(GPS).Horizontal will be the A Zone and Five wells are for injection into determined to the closest 1.0 cm using GPS and the B/C Zone (Figure 9-1). ground and top of casing elevations will be determined to the closest 3.0 cm. The missing information listed in Attachment 1 and has been S-SSWP.DOC 9 September 1996