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0 Page 4 of 11 <br /> for acceptable well destruction methods. As stated in this Ordinance, "if the <br /> well construction is unknown and/or is located in an area of known or <br /> suspected pollution or contamination, the well shall be destroyed by <br /> removing all material within the original borehole (including the well casing, <br /> screen, filter pack and annular seal)". [SJCEHD Ordinance 13.17.6]. <br /> In addition, our Ordinance requires, "Any obstructions found in the well or <br /> boring shall be removed before filling and sealing operations <br /> begin."[SJCEHD Ordinance 13. 17.3] 1 bring this point to your attention so <br /> that you may verify that each well proposed for pressure grouting can be <br /> 'tagged' long before destruction procedures begin and shown to be open <br /> and unobstructed. I will tag each well before the pressure grout procedure <br /> begins. If not open to total depth of construction, the well does not qualify <br /> for pressure grout destruction and must have the contents removed. I <br /> caution that air knife hole/well clearing may damage or obstruct the casing <br /> if adequate precautions are not taken. <br /> I have evaluated each well proposed to be pressure grouted to see if they <br /> qualify and are not in an area of known or suspected <br /> pollution/contamination. I used the most current soil, groundwater, or soil <br /> vapor laboratory data as a determination for contamination. Any detectable <br /> contamination noted in samples collected from the well's installation or <br /> operation disqualifies a well from pressure grout destruction. Wells not <br /> qualified for pressure grout destruction must have the contents of the well <br /> removed. <br /> Based on 2008 soil data (the most recent I could find) air sparge wells, AS- <br /> 14, AS-15, AS-17, AS-18, AS-20, and AS-21 are impacted and are also <br /> within the iso-concentration line of residual groundwater as noted in <br /> AECOM's figures 11 and 14, dated 9-22-2010 and as such, do not qualify <br /> for pressure grout. These wells must have the contents of the well <br /> removed. <br /> Superimposing contaminant iso-concentration lines from AECOM's 9-22- <br /> 2010 Figure 11 onto their Figure 3 dated 1-17-2011 , air sparge well AS-33 <br /> and vapor wells VEW-10A, VEW-10B, VEW-11A, VEW-11 B, VEW-12A, <br /> VEW-1213, VEW-16 do not qualify for pressure grout destructions as they <br /> are within the line of estimated residual contamination. VEW-19 and VEW- <br /> 22 are also within the contaminated area and also had soil vapor hits. As <br /> such, these wells do not qualify for pressure grout destruction either. <br /> MW-16 and MW-32 are both within areas of contamination as noted on <br /> Figure 14, 9-22-2010-AECOM and Figure 15, 9-22-2010-AECOM. Neither <br /> 11/7/2011 <br />