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CONDOR EARTH <br />188 Frank West Circle, Suite 1 <br />Stockton, CA 95206 <br />209.234.0518 <br />Fax 209.234.0538 <br />www.condorearth.com CONDOR <br />June 29, 2017 <br />Alan Buehler <br />Engineering Geologist <br />Central Valley Regional Water Quality Control Board <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, CA 95670 <br />Subject: Addendum to Work Plan for Additional Subsurface Investigation and Well Installation <br />San Joaquin County Public Works, Hazelton Complex <br />1810 E. Hazelton Avenue, Stockton, CA (RB Case #390489) <br />Condor Project No. 596006 <br />Dear Mr. Buehler: <br />Pursuant to your email dated June 26, 2017, Condor Earth (Condor) has prepared this Addendum to the <br />Work Plan for Additional Subsurface Investigation and Well Installation (Work Plan) dated June 19, <br />2017, to address revised downgradient locations for proposed borings CPT-1 and CPT-2 and proposed <br />grouting methods to be used with the Membrane Interface Probe/Hydraulic Profiling Tool (MI-HPT) at <br />the San Joaquin County Public Works Hazelton Complex (Site) located at 1810 E. Hazelton Avenue, <br />Stockton, California. <br />Proposed Revised Locations of CPT Borings <br />Based upon our telephone conversation on June 26, 2017, in order to minimize potential "drag-down" of <br />contaminants into deeper zones, Condor is proposing to relocate proposed deep investigative borings as <br />described below. <br />CPT-1 will be relocated approximately 25 feet to the east-northeast from the initial proposed <br />location, approximately 35 feet downgradient of well MW-2; <br />CPT-2 will be relocated approximately 135 feet to the east-northeast, approximately 87 feet <br />downgradient of well MW-2 and 50 feet downgradient of proposed boring CPT-1. <br />Proposed locations are shown on the revised Figure 6, attached. <br />Proposed Grouting Method <br />Condor contacted John Rogie, PG, President of California Push Technologies, Inc. (C-57 License <br />#884827) regarding the grouting method to be employed after completing borings CPT-1 and CPT-2. The <br />MI-HPT tooling prevents down-hole grouting of borings through the rods. As a consequence, the initial <br />rods and MI-HPT tooling will be extracted from the borehole, and standard push rods will be immediately