Laserfiche WebLink
a <br /> Ground Zero Analysis,Inc. '"' <br /> Valentine Property <br /> Project No.:723.2 <br /> Well Destruction Work Plan Addendum <br /> April 30, 2013 <br /> Initial Method <br /> Based on the recommendations of the CMT well manufacturer (Solinst), a pressure grouting <br /> method is recommended for the destruction of CMT wells MW-7, MW-8 and MW-9 as over- <br /> drilling has shown to be difficult and ineffective. The pressure grouting method is as follows: <br /> • A thin cement grout will be pumped under pressure through a small diameter tremie tube <br /> to the bottom of each chamber of the CMT well. In this manner, the grout will displace <br /> the water in the well ensuring that it is completely filled with grout. Solinst recommends <br /> a grout mixture of 55 lbs ultrafine cement, 2.2 lbs of super plasticizer and 110 lbs of <br /> water, or about 13.2 gallons. The tremie tubing will be left in the well. <br /> 9 After the grout has been filled to the top of each chamber of the CMT well, a pressure <br /> cap will be fitted to the casing and the well pressurized to 25 psi. If the grout settles, <br /> additional grout will be pumped into the well casing. This will force the cement into the <br /> filter pack. <br /> After the grout has been installed, the top of casing of the CMT wells will be drilled out <br /> to a depth of 5 ft below grade and the holes will be filled with clean dirt and capped with <br /> asphalt or concrete in the upper 8 inches below grade for wells in asphalted or concrete <br /> areas(respectively). <br /> Secondary Method <br /> In the case that the pressure grouting of the CMT wells is not successful, each of the three <br /> CMT wells will have their entire contents drilled out and the borehole filled with neat cement <br /> grout to grade. An 8 inch hollow-stem auger fitted with a special designed stinger to keep it <br /> centered in the well is proposed to drill out the well. As an added step to stay centered within <br /> the well, the drilling will be continuous without stopping to clean the augers until we reach <br /> total depth. <br /> If you should have any questions please do not hesitate to call, <br /> Respectfully Submitted, �c_\oNAt GFO <br /> RAYNOLD I. N <br /> Q- KABLANDW <br /> No.523A <br /> Raynold I. Kablanow II, Ph.D. `1� 31-� �Q <br /> California Professional Geologist#5234 OF CAL`EpP� <br /> Certified Hydrogeologist#442 <br /> cc: Harlin Knoll —SJC EHD <br /> Mike Smith - CRWQCBCVR <br /> i <br /> I <br />