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• Wells with unknown construction and/or located in an area of known or suspected <br /> contamination <br /> 2. Wells will be destroyed by pressure grouting and left in place if the most recent sampling <br /> laboratory data reports non-detectable concentrations of contaminants of concern and with <br /> acceptable laboratory detection limits. <br /> • A neat cement grout (containing less than 4% bentonite) will be pumped under pressure <br /> through a tremie pipe to the bottom of the well. <br /> • After the groundwater has been removed and the grout has been filled to the top of the <br /> well casing, a pressure cap will be fitted to the casing and the well pressurized to 25 psi. <br /> If the grout settles, additional grout will be pumped into the well casing. This assures <br /> grout is pumped into the filter pack. <br /> • Following grouting, at least the top three (3) feet of the well will be drilled out with an <br /> auger that is at least one (1) foot larger in diameter than the auger originally used to <br /> install the well. <br /> • In addition, the soil around the cut-off casing will be removed to a depth of an additional <br /> six (6) inches below the top of the cut-off casing. Upon filling the rest of the casing, <br /> grout sealant will be allowed to spill out of the top of the well casing to form a mushroom <br /> cap seal, with at least six (6) inches of grout both below and above the casing. <br /> All soil will be properly containerized for disposal. All groundwater displaced to the surface <br /> during grout installation shall be pumped out of the excavation and containerized for proper <br /> disposal. <br /> Schedule and Renortin� <br /> Following SJCEHD approval of this well abandonment work plan, Ground Zero Analysis, Inc. <br /> will obtain bids from licensed drilling contractors and obtain the proper permits prior to <br /> commencing work. Our goal is to complete the well destruction work by mid June contingent <br /> upon work plan approval. <br /> A summary of the well destruction and site closure activities will be presented in a report, <br /> including a discussion of the well destruction efficiency (grout volume used versus grout volume <br /> calculations). Copies of the report will be submitted to both the appropriate County and State <br /> regulatory agencies prior to July 1, 2013. <br /> If you should have any questions please do not hesitate to call. <br /> Respectfully Submitted, 0\0 <br /> 4 <br /> A` GFp� <br /> a RAYNOL 1. <br /> KABLANOW <br /> Raynold Kablanow II, Ph, No.5234 ' <br /> California Professional Geologist#5234 1,9r -z1_)4 Q�\� <br /> Certified Hydrogeologist#442 FOF CAO- <br />