WORK PLANS - Laserfiche WebLink

Home Browse Search

REVISED ADDITIONAL ASSESSMENT WORKPLAN ! JAY'S MINI-MART,STOCKTON SEPTEMBER 2003 E The remaining annular space will be filled with a cement slurry mixture containing less than 5% bentonite. To protect the integrity of the wells, the top of the wellhead assembly will be enclosed at the surface in a water tight, traffic-rated, flush-mounted well box . All work will be performed in accordance with the County regulations, California Code of Regulations, Title 23, Section 2647 and 2648 and the California Department of Water Resources Bulletins 74-81 and 74-90. A typical monitoring well construction detail is shown in Figure 5. i Drill cuttings will be placed in DOT approved 55-gallon drums;'labeled accordingly and stored on-site until the soil is profiled for disposal. Disposal of the cuttings will be completed by GHH. Well Development 4 The groundwater monitoring wells will be developed using a srge block and/or submersible pump to remove fines and develop the sand pack and nearby aquifer materials. Turbidity will be monitored to check the effectiveness of development. Development and purge water will be put into DOT approved 55-gallon drums and labeled accordingly. The drums will be left on-site pending laboratory analyses and selection of an appropriate disposal, which will be i completed by GHH. Groundwater Purging The newly developed wells will be allowed to equilibrate for a minimum of 48-hours prior to purging for sampling. Prior to purging, depths to groundwater in all wells will be measured to the nearest 0.01-foot. A minimum of three casing volumes of groundwater will then be pumped from each well prior to groundwater sampling. Specific conductance, pH, temperature, and turbidity will be measured during the purging process. When these parameters have relatively stabilized, the�wells will be allowed to recharge and then sampled. Groundwater Sampling ; ! Groundwater samples will be collected from all on-site wells after the wells have sufficiently recovered to the static groundwater levels, or in the event that the well is pumped dry during k purging, when the water level recovers to at least 80% of the original water level. In the event that the wells are not sampled within 24-hours of purging, each well will be re-purged until at least three well volumes have been removed prior to sampling i 6 t i ,!