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Page 8 of 15 <br /> provides for acceptable well destruction methods. As <br /> stated in this Ordinance, "if the well construction is <br /> unknown and/or is located in an area of known or <br /> suspected pollution or contamination, the well shall be <br /> destroyed by removing all material within the original <br /> borehole (including the well casing, screen, filter pack and <br /> annular seal)". [SJCEHD Ordinance 13.17.6]. <br /> In addition, our Ordinance requires, "Any obstructions <br /> found in the well or boring shall be removed before filling <br /> and sealing operations begin." [SJCEHD Ordinance 13. <br /> 17.3] 1 bring this point to your attention so that you may <br /> verify that each well proposed for pressure grouting can be <br /> 'tagged' long before destruction procedures begin and <br /> shown to be open and unobstructed. I will tag each well <br /> before the pressure grout procedure begins. If not open to <br /> total depth of construction, the well does not qualify for <br /> pressure grout destruction and must have the contents <br /> removed. I caution that air knife hole/well clearing may <br /> damage or obstruct the casing if adequate precautions are <br /> not taken. <br /> I have evaluated each well proposed to be pressure <br /> grouted to see if they qualify and are not in an area of <br /> known or suspected pollution/contamination. I used the <br /> most current soil, groundwater, or soil vapor laboratory <br /> data as a determination for contamination. Any detectable <br /> contamination noted in samples collected from the well's <br /> installation or operation disqualifies a well from pressure <br /> grout destruction. Wells not qualified for pressure grout <br /> destruction must have the contents of the well removed. <br /> Based on 2008 soil data (the most recent I could find) air <br /> sparge wells, AS-14, AS-15, AS-17, AS-18, AS-20, and <br /> AS-21 are impacted and are also within the iso- <br /> concentration line of residual groundwater as noted in <br /> AECOM's figures 11 and 14, dated 9-22-2010 and as <br /> such, do not qualify for pressure grout. These wells must <br /> have the contents of the well removed. <br /> Superimposing contaminant iso-concentration lines from <br /> AECOM's 9-22-2010 Figure 11 onto their Figure 3 dated 1- <br /> 17-2011 , air sparge well AS-33 and vapor wells VEW-10A, <br /> VIEW-1013, VEW-11A, VEW-1113, VEW-12A, VEW-12B, <br /> 12/20/2011 <br />