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17 November 2021 AdvancedGeo <br /> Project No. 02-0926 An Employee-Owned Company <br /> Page 2 of 2 � <br /> suspected that during well destruction drilling at MW-10, the hollow stem augers may <br /> have slightly veered from the boring trace, towards the overpass to the west. <br /> On 17 November 2021, AGI received construction and repair plans for the overpass from <br /> the City of Stockton. <br /> AGI has reviewed the plans and it appears that a large "concrete pier" constructed to <br /> anchor beams from the sidewalls of the overpass wall may be the cause of the refusal <br /> conditions encountered during the attempted well destruction of MW-10 (see attached <br /> plans). <br /> AGI has consulted with the City of Stockton and determined it's unsafe to continue to <br /> attempt over-drilling well MW-10. Drilling in the location may damage the pier used to <br /> anchor the overpass wall and will likely continue to damage drilling equipment. <br /> It is AGI's opinion that the well/borehole be grouted in place to the current drilling depth <br /> of 17 feet bsg. Therefore, AGI requests a one-time variance be granted to accomplish <br /> this and complete well destruction activities at MW-10. At the request of SJCEHD, AGI <br /> has attached historical analytical data, which documents that contaminants of concern <br /> have never been reported in the location of the well. AGI has also attached the referenced <br /> plans from the City of Stockton for your review and consideration of the one-time variance <br /> request. <br /> The open borehole for MW-10 is currently being secured by cold patch asphalt and a <br /> steal plate at the surface. Due to the disposition and location of the well, AGI kindly <br /> requests an expedited review of the one-time variance. <br /> If you have any questions, AGI and the City of Stockton could arrange for a group <br /> conference call to further discuss the variance request. <br /> Sincerely, <br /> AdvancedGeo, Inc. �o\P W AA4'4 <br /> 4 Q C y�N� <br /> m � <br /> No,8574 <br /> Daniel J. Villanueva Brian W. Millman P <br /> Senior Geologist Senior Geologist STq�OFCAL,Fd��� <br /> California Professional Geologi . 8574 <br />