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The location of the fiber optic line is shown in the attached picture. The orange diamonds <br />marked by Comcast's contractor and the red dashed lines indicate the limits of the fiber <br />optic line trench. According to Comcast's contractor, the fiber optic line is directly buried <br />(not in conduit) and may meander through the limits of the trench. In summary, we do not <br />know how close the fiber optic line is to wells MW-2, MW-2X and OS-1. Theoretically, <br />it could be less than a foot and over-boring, especially to a diameter larger than the <br />original boring, is unduly hazardous. <br />Attached is a photo of the steel casing of OS-1. Also attached is a photo of similar 1/2" <br />diameter steel casing that was the subject of an attempted drill-out at another site. Drill- <br />out was not feasible and driller's equipment was damaged. <br />Attached is a photo of the steel conductor casing of MW-202 <br />A plume definition map is attached <br />We understand that San Joaquin County well standards allow for pressure grouting in situations <br />where groundwater will be adequately protected or where drill-out is not feasible. As a general <br />rule, pressure grouting is preferable to drill out from the standpoint of time, cost and waste <br />generation. We hope you will consider our recommendations and if you have any questions or <br />need any additional information, do not hesitate to call Greg Stahl or me at (209) 522-4119. <br />Respectfully submitted, <br />y wse <br />ject Coordinator <br />jweese@groundzeroanalysis.com <br />Attachments <br />Page 2 of 3