WORK PLANS - Laserfiche WebLink

Home Browse Search

GES GENESIS ENGINEERING&REDEVELOPMENT pack prior to sealing the annular space. Additional sand will be added as needed to ensure the sand pack extends to at least 2 feet above the top of the well screen. At least 2 feet of hydrated bentonite will be placed above the sand pack. The remaining annular space will be sealed with cement grout or bentonite. The wellhead will be completed below grade and will be protected by a traffic-rated monitoring well vault with a watertight lid. The groundwater monitoring wells will be developed at least 24 hours after installation. Development will consist of surging and pumping until the water is relatively sediment free and specific parameters (temperature,pH, and specific conductance)have stabilized. Dedicated sample tubing and foot valves will be installed in each shallow monitoring well. 7 Groundwater samples will be collected from the new monitoring wells approximately 72 hours after all of the wells have been developed. 2.3.5 Test Well Installation The pump test well will be constructed of 6-inch diameter, schedule 80,poly vinyl chloride casing, and machine slotted 0.010-inch screen (or other suitable size depending on the results of the sieve analyses)at the bottom. A twenty-foot long well screen will be installed at the approximate depth interval of 40 feet to 60 feet bgs. The annular space around the well screen will be backfilled with clean, Monterey sand by placing the sand through the augers as they are removed from the boring. The well will then be surged to settle the sand pack prior to sealing the annular space. Additional sand will be added as needed to ensure the sand pack extends to at least 2 feet above the top of the well screen. At least 2 feet of hydrated bentonite will be placed above the sand pack. The remaining annular space will be sealed with cement grout or bentonite. The wellhead will be completed below grade and will be 'Etr�"'`�e protected by a traffic-rated monitoring well vault with a watertight lid. The test well will be developed at least 24 hours after installation. Development will consist of surging and pumping until the water is relatively sediment free and specific parameters (temperature,pH, and specific conductance) have stabilized. A groundwater sample will be collected from the test well approximately 72 hours after all of the wells have been developed. 2.3.6 Subsurface Logging The field geologist shall log the subsurface conditions encountered in the borings and record the information on a Drilling Log Form. Borings shall be logged as follows: • Description of soils shall be performed using the Unified Soil Classification System(USCS) (ASTM D-2488),with color descriptions made using a Munsell Color Chart Ripon Farm Services,Inc. 5 of 15 Sampling and Analysis Plan July 2009