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Page 3 of 3 <br /> Our experience with polyethylene tubing is that they become brittle and break easily and there may not be a way <br /> to tell the condition of such plastic tubing once installed within the PVC. <br /> However, if the operator wants to install the plastic tubing, they should provide assurance that installing the plastic <br /> tubing will not defeat the purpose of gas monitoring and that it will not compromise the integrity of monitoring. <br /> I wonder if the experience of CalRecyle staff is gained from PE pipe that is exposed to sunlight. In our case,the <br /> tubes will not be exposed to sunlight at all. In our case,the tubes are entirely encased within the existing pipes, <br /> and these pipes enclosed within the soil and a protective metal enclosure. <br /> We propose polyethylene because it is suitable for the environment in which it will be used,and it is available in <br /> colors so we can color-code the tubes(shallow, intermediate deep) and forever avoid confusion as to which <br /> tube is to which depth. <br /> In addition,the tubes can be easily removed for insertion of television camera. <br /> I hope this address any concerns, but if not, please let me know. <br /> Mike Carroll <br /> 209-468-3066 <br /> 2/22/2012 <br />