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0 0 <br />8. However, there is a lack of groundwater elevation data to the east of the landfill cells, which is purpose of the <br />location of G-10. <br />By the middle of February 2018, the northern direction of flow will be better defined with the installation of G-10,. At <br />that time we will have a better interpretation of the groundwater flow direction to determine the location of the other <br />two new wells. At that time, I will send in another brief work plan with the locations of the next two wells. At the <br />present time the County has scheduled the driller to commence the installation of those two wells on February 19, <br />2018. With the groundwater exploration program described in this brief work plan, San Joaquin County's North County <br />landfill should have a Title 27 compliant groundwater monitoring system by the end of March 2018. <br />G-10 will be constructed in conformance with previously submitted work plans. The ground surface elevation at the G- <br />10 location is approximately 120 ft, NAVD. The projected elevation of groundwater is in my professional opinion <br />approximately -55 ft NAVD, which would make the depth to groundwater approximately 175 ft. With the installation of <br />a 20 -foot long screen the approximate depth of the well is approximately 195 ft. These hydrogeologic assumptions will <br />be confirmed in the field at the time of well installation by a geologist under my direct supervision. Any deviations will <br />be communicated to you. <br />Please accept this brief work plan for the commencement of the installation of new well G-10 at the North County <br />landfill in San Joaquin. Additional work plans will be submitted to you for approval for installation of the other two <br />monitoring wells. On a separate note, San Joaquin County requests the Water Board to rescind the prohibition from <br />placing waste in Cell 5B. San Joaquin County will submit a letter to the Water Board making this request for permission <br />to place waste in Cell 5B at the North County landfill. <br />Please call or email me or Taj Bahardori with any comments or questions. We respectfully await your approval of this <br />work plan. <br />(Formerly CB&I, Environmental and Infrastructure, Inc.) <br />Julian C. Isham PG, CEG, CHG <br />Geology Manager <br />Solid Waste Services <br />Cell: 925-457-1130 <br />iulian.isham@aptim.com <br />APTI M <br />4005 Port Chicago Highway <br />Concord, CA 94520 <br />USA <br />