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Hope this helps streamline the abandonment process and leads to a clear idea of what is expected in <br /> the field. <br /> Thanks, <br /> Stephanie McKenna <br /> Project Manager - Marketing Business Unit <br /> -----Original Message----- <br /> From: Mike Infurna [EH] [mailto:Mlnfurna@sjcehd.com] <br /> Sent: Wednesday, August 17, 2011 9:44 AM <br /> To: Jim Barton; McKenna, Stephanie <br /> Cc: Brenda Evans <br /> Subject: RE: 5400 Pacific Avenue Stockton <br /> Thank you Jim. <br /> Ladies and Gentleman, <br /> For your information, I have been in contact with Josh Ewert of GeoCon regarding which wells will be <br /> pressure grouted and which will have the contents removed. <br /> Including the requirement for monitoring wells #2, 3, & 11 as listed in the CVRWQCB August 17 <br /> letter, I have asked Josh to provide me a list of ALL of the wells for this site and a notation next to <br /> each as to the method of destruction he would like to use. I will review this proposal to see if the wells <br /> Josh has proposed for pressure grouting qualify. If they don't, they will be required to have the <br /> contents removed. To qualify for pressure grouting, the soil, gw, and vapor data indicating there is no <br /> residual contamination present must be available. Wells with NO data available will be considered <br /> UNKNOWN and not qualified for pressure grout. <br /> Typically, wells of unknown construction, obstructed, contaminated or in an area of known <br /> contamination", or incapable of being properly pressure grouted must have the contents removed. <br /> The EHD is mandated by County Ordinance to require wells to have the contents removed <br /> (commonly noted by consultants and drillers as 'over-bored') if they do not meet the requirements for <br /> pressure grouting. <br /> 'The EHD interprets 'area of contamination' as the current contamination, or lack of, in the well's <br /> most current lab data for all/any matrix. Laboratory concentrations for any constituent of concern that <br /> is significantly above acceptable detection limits indicates the well is contaminated and cannot qualify <br /> for pressure grout destruction. <br /> The EHD accepts wire line destruction (down-hole explosion) and over-boring of wells as 'removing <br /> the contents'. Wells much be drilled out with at least the same size auger as installed, or in the case <br /> of 'nested wells, with augers of adequate size to remove all the contents of the well. Experience has <br /> shown nested wells do not provide a casing that is centered in the borehole since a minimum of 2 <br /> inches of grout annulus is required between all casings and borehole at installation. As such, a <br /> nested well with two casings or even three casings that cannot qualify for pressure grout must have <br /> the destruction auger centered on the deepest casing and of adequate size to ensure the radius of <br /> the bit reaches across the borehole to completely remove the grout, bentonite seal, and filter pack <br /> that was installed during the well's construction. As an example, to destroy an original 10-inch <br /> 2 <br />