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a <br />Natalia r r • '" • <br />From: Joyesh Chandra <Jchandra@sjgov.org> <br />Sent: Wednesday, December 03, 2014 11:48 AM <br />To: Natalia Subbotnikova [EH] <br />Cc: Robert McClellon [EH]; Taj Bahadori; Michael Carroll <br />Subject: FH -MW -6 Revised Design <br />Attachments: FH -MW -6 GW Well Inst -Work Plan-REv 12-3-14.pdf, Fig 2-FH-MW-6- <br />DblScreenWell-12-3-14.pdf <br />Hello Natalia <br />Re: FA# 4517 <br />SR# 0070696 <br />Our division is submitting a design change for the groundwater well MW -6 at Foothill landfill <br />(Attached -Figure 2). The new design is for a double screen groundwater monitoring well. The design <br />change is made to address the continuous drop in groundwater table in the Central Valley. In the <br />past five years, Solid Waste had to replace few groundwater wells due to the decreasing groundwater <br />table. Below is a list of replaced wells: <br />1. Foothill landfill (MW -1), <br />2. Harney Lane landfill two wells (MW -3 and MW -4), <br />3. North County landfill (G-2 and G-5). <br />The new well design will allow groundwater monitoring for a longer period and will eliminate re -drilling <br />of new wells within a short period of time as the groundwater table continues to drop. <br />The packer shown in Figure 2 separates the monitoring intervals. When the first screen interval dries <br />out, the packer will be removed and monitoring will continue from the second screen interval. We <br />have spoken to Greg Drilling, and they have constructed this type of well and are familiar with the <br />packer process. The Viton body packer is used widely in environmental work, is inert in water and <br />does not add any VOCs. <br />The work plan and specs submitted earlier would remain the same. Attached is the work plan with <br />the revised figure 2. Could EHD review the new design and approve for installation? We have <br />tentatively scheduled the well installation for the first week of January 2015. <br />Thanks <br />JOYESH CHANDRA <br />SAN JOAQUIN COUNTY I PUBLIC WORKS DEPARTMENT I SOLID WASTE DIVISION <br />1810 E. HAZELTON AVE STOCKTON, CA 95201 <br />PH: (209) 468-3066 1 FAX: (209) 468-3078 <br />www.s gov.org/solidwaste <br />