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Addendum to Work Plan <br />San Joaquin County Hazelton Complex <br />June 29, 2017 <br />Page 2 <br />pushed into the borehole to the full depth. The borehole will then be grouted through the rods, using a <br />tremie system, with Portland cement grout. According to Mr. Rogie, it will take approximately ten <br />minutes or less to trip out of the borehole with the MI-HPT tooling and trip back down with standard rods <br />to begin the grouting process. Mr. Rogie indicated that this is standard procedure in cone penetrometer <br />testing (CPT) investigations. The expected short time needed to exchange rods in the borehole, and the <br />fact that the revised CPT boring locations will be downgradient from the heart of the dissolved <br />contaminant plume, minimize the potential of vertical migration of contaminants through the borehole. <br />Please feel free to contact me at jlaneAcondorearth.com or (209) 938-1061 if you have any questions <br />regarding this submittal. <br />Respectfully submitted, <br />CONDOR EARTH <br />Leβ€ž <br />John P. Lane, PG <br />Senior Geologist <br />Attachment: <br />Revised Figure 6β€” Site Map Showing Revised Proposed Borings/Wells <br />cc: Efrain Lopez, San Joaquin County β€” Capital Projects <br />X: \Project\5000_mj \5960 SJC UST RFQ\5960C County of San Joaquin - SJC Public Works\ 596006\ CorrespondencML 20170628 WP Addendum 5960C6.docx <br />CONDOR