WORK PLANS - Laserfiche WebLink

Home Browse Search

KennedVAenks Consultants 3. Ensure that filter pack sand for the well extends to approximately 2 - 3 feet above the top of the screened interval. 4. If required in the well construction permit, notify the appropriate inspector prior to placing the well seal. 5. Place at least a 5-foot-thick bentonite pellet seal above the sand pack, as the auger and/or casing is removed from the boring. If the seal is placed above the water table, the bentonite pellets must be hydrated with potable water prior to placement of the annular seal. 6. Fill the remainder of the annulus between the well casing and the borehole wall with cement/bentonite grout(with approximately 5 percent bentonite), or a high-solids bentonite slurry (11 to 13 pounds per gallon), to a depth of approximately 1 foot below ground surface. If the water level is higher than the seal, use a tremmie pipe to place the grout. 7. Install either a threaded cap or a locking watertight expansion plug on the monitoring well. Place a steel hasp-locking well housing over the top of the well and cement it into the annulus of the boring. 8. Place a traffic-rated precast concrete or steel well enclosure approximately 1 to 2 inches above grade, and cement it into place with concrete. Have a concrete apron constructed around the well housing enclosure to facilitate runoff. 9. For aboveground completion, ensure that the well casing extends approximately 3 feet above ground surface. An 8-inch-diameter hasp-locking steel well housing surrounds the well casing. Traffic bollards can be installed around the well housing as necessary. 10. Repeat Steps 1 through 9 for all monitoring wells at site. 11. Following the curing of the grout (approximately 48 hours), each monitoring well is developed. Prior to development activities, measure the depth in each well to static water level and total casing depth. 12. During development of each well, ensure that field parameters and observations are recorded on a Kennedy/Jenks' purge and sample form. Information to be recorded includes, but is not limited to, the following items: Depth to water Development time and volume Development (flow) rate pH, temperature, specific conductivity, and turbidity Other observations, as appropriate (e.g., color, presence of odors, or sheen) 13. Develop each monitoring well until water of relatively low turbidity is removed from the casing. 14. First, clear the well of fines with a bailer or pump. Appendix D Work Plan for Improved Detection Monitoring Program Page D-2 Musco Family Olive Company, Tracy, California g4 .p1admt V4 IOMX104 G pWwp i.%appdxd da