Laserfiche WebLink
GeologicalTechnics Inc. MAY 2 <br /> 1 <br /> 2741 River Road <br /> Modesto,CaCifomia 95351 r E.N V I., I,i'v',�l.r�. ''�_-A LTH <br /> (209)538-64241FaY#538-5852 <br /> PERMIT/SERVICES <br /> Report <br /> Monitoring Well Abandonment & Site Closure <br /> Former Moresco Property <br /> 16865 Gawne Road <br /> Stockton, California <br /> i <br /> Proj ect No..251.3 <br /> May 25 2000 <br /> WELL ABANDONMENT <br /> On December 27, 1999, GTI and V&W Drilling of Rio Vista C57#720904 (916-777-4100), <br /> owner-Robert Vickery, mobilized to the site to, properly abandon the monitoring well and <br /> � <br /> four soil vapor extraction system wells. Air recharge wells AR-2 and AR-3 were paved over <br /> with asphalt and they were addressed during a second visit on March 7, 2000. <br /> I It <br /> The following work was performed during the abandonment.procedure: <br /> • The concrete collars and well boxes were removed with a jackhammer. <br /> • Monitoring well MW-1 and soil vapor extraction well VEW-1 were completely over <br /> drilled. <br /> • The grout installation included pressure-grouting methods using a slurry pump and tremie <br /> until a mushroom over the t ``� <br /> pipe op of casing had been formed. A pressure cap was then <br /> installed and grout was pumped into the well under 60 to 80 psi to force the grout into the <br /> filter pack. <br /> • Neat cement grout (Type 1/11 Portland witll about 4% bentonite) was used to close the ` <br /> wells. <br /> • In completing the grouting of the casing, grout volumes were tracked in order to see how <br /> measured volumes compared to the estimated volumes. These volumes were measured to <br />' the nearest 5 gallons in the field so there is`some error. Both the theoretical and actual <br /> volume data is included in Table 1. <br /> • In each case, the volume of grout used exceeded the casing volume. <br /> • The wells that had been installed to surface grade were drilled to five feet below grade. <br />�t <br />