Laserfiche WebLink
!i <br /> I� <br /> Appendix C <br /> Field Report <br /> Groundwater Investigation Program <br /> From June 13, 1988 through August 19, 1988, three shallow ground- <br /> water monitor wells were drilled, installed, developed, surveyed <br /> and sampled at the Ragu Foods, Inc. Stockton, CA. facility. The <br /> location of the wells is shown in Figure 1 of Section 3 in the <br /> report. <br /> - Well Installation <br /> Well drilling commenced on June 14, <br /> Monitor 1988 at monitor well WI-1.wells MW-2 and W7-3 were drilled and installed on June 15 <br /> and June 16, 1988, respectively. A central Mining Equipment 55 <br /> (CME-55) drill rig using 10 inch outer diameter, 6.25 inc <br /> diameter hollow stem augers was use h inner <br /> Montorboreholes. Cuttings returned by thedauger flightsl wereicontaiel <br /> n- <br /> erized in 55 gallon drums and left on site until soil analytical <br /> results were obtained. (The soil sample results were all <br /> nondetectable concentrations for all of the analytes; consequent- <br /> ly, the cuttings were dispersed at the site.) Construction of <br /> each well took place inside the augers, with the screen and <br /> casing first lowered into place and the construction materials <br /> (sand and bentonite) introduced through the annulus. As the <br /> construction materials filled in the borehole, the augers were <br /> gradually withdrawn. Once the sand pack and bentonite seal had <br /> been placed around the screen and casing, all auger were removed <br /> from the borehole. A 5% bentonite--cement grout was then mixed at <br /> the surface and pumped into glace through a flexible hose. The <br /> grout was allowed to harden overnight, at which point a locking <br /> riser and traffic vault was cemented, in place. Construction <br /> materials for all wells were of the same type, as follows: <br /> screen - Schedule 40 flush threaded PVC, 0.020 inch <br /> slot size: <br /> casing - Schedule 40 flush threaded PVC; <br /> caps - Schedule 40 flush threaded PVC for bottom caps <br /> and expansion type water tight top caps; <br /> gravel pack - Monterey #3 sand, washed, kilned and bagged; <br /> seal - 0.5 inch bentonite tablets; <br /> grout -- potable water, Quik Gel bentonite-_powder_-and-- - <br /> Portland.-T - _- -- - --- -- <br /> e - I cement. <br /> C - Z <br />