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Thank You <br /> Av� Taj M. Bahadori, PE <br /> Senior Civil Engineer <br /> San Joaquin County Solid Waste <br /> Voice: 209-953-7316 <br /> Email: tbahadoriOsj ov.oro <br /> 1810 E. Hazelton Avenue, Stockton, CA 95205 <br /> From: DelFrate,Todd@Waterboards rmailto:Todd.Del Frate@waterboards.ca.gov] <br /> Sent: Tuesday, November 25, 2014 9:47 AM <br /> To: Taj Bahadori <br /> Cc: Hold, Howard@Waterboards; Michael Carroll; Joyesh Chandra; 'Isham, Julian'; DelFrate, Todd @Waterboa rds; Robert <br /> McClellon [EH] <br /> Subject: RE: Double-screening for new groundwater well MW-6 at Foothill Landfill <br /> Taj,thanks for the overview of valley GW conditions and the review of GW elevation data at the foothill landfill. Staff <br /> has reviewed the revised well design submitted and is concerned the design now being proposed is penetrating 40 feet <br /> of water bearing zone. The County has not provided any geologic evidence that a continuous water bearing zone at this <br /> site exists. Furthermore, staff had approved a work plan with a well design that is similar to well MW-5. This design is a <br /> more sophisticated and complex design that requires greater scrutiny. <br /> As such, by 9 January 2015, please revise and submit a work plan that reflects the design change and describe the <br /> rational for the design change. Secondly, prepare geologic cross sections with all site groundwater wells to characterize <br /> the subsurface conditions. Include screen intervals and historic high and low groundwater elevations and last known <br /> VOC detections at each well. Foothill Landfill is a large site with data points spaced at great distances, reducing <br /> confidence in subsurface details. Please do not overextend your knowledge of the underlying geology without <br /> supporting data. A proper assessment will take several cross sections to flesh out. <br /> Staff will send a formal letter for the file. Any questions let me know. We look forward to your revised work <br /> plan. Thank you. <br /> From: Taj Bahadori [mailto:tbahadori@sjgov.org] <br /> Sent: Monday, November 24, 2014 4:17 PM <br /> To: DelFrate,Todd@Waterboards <br /> Cc: Hold, Howard@Waterboards; Michael Carroll; Joyesh Chandra; 'Isham, Julian' <br /> Subject: RE: Double-screening for new groundwater well MW-6 at Foothill Landfill <br /> Todd, <br /> The Central Valley has been in overdraft for several decades. Last year the County had to replace one well at the Foothill <br /> landfill (MW-1),two wells at the Harney Lane landfill (MW-3 and MW-4), and two wells at the North County landfill (G-2 <br /> and G-5). In addition, several other wells at the North County landfill only have a couple feet of water in them and may <br /> 2 <br />