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0.11.1.471 .0#11° <br />C•l11•0 1•Ni • <br />Water Boards <br />Central Valley Regional Water Quality Control Board <br />EDMUND G. BROWN JR. <br />GOVERNOR <br />MATTHEW RODR1OUE2 <br />SECRETARY FOR <br />ENVIRONMENTAL PROTECTION <br />12 July 2017 <br />Sal Hernandez <br />Facilities Management Division <br />San Joaquin County <br />4520 W. Eight Mile Road <br />Stockton, CA 95202 <br />PUBLIC WORKS, 1810 EAST HAZELTON AVENUE, STOCKTON, SAN JOAQUIN <br />COUNTY, CASE #390489 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the Work Plan for Additional Subsurface Investigation and Well Installation (Work <br />Plan) dated 19 June 2017, Addendum to Work Plan for Additional Subsurface Investigation <br />and Well Installation (Addendum) dated 29 June 2017, and Second Addendum to Work Plan <br />for Additional Subsurface Investigation and Well Installation (2 nd Addendum) dated <br />11 July 2017, submitted on your behalf by Condor Earth Technologies Inc. (Condor) for the <br />Public Works property located at 1810 East Hazelton Avenue in Stockton (Site). <br />In the Work Plan, Addendum, and 2nd Addendum, Condor proposes to advance one (1) <br />shallow soil boring, two (2) cone penetration test (CPT) borings, and install three (3) <br />monitoring wells and one (1) ozone injection well, as detailed in the table below. <br />Location Type Total <br />Depth <br />(ft bgs) <br />Screen Soil Samplin.• Additional Interval <br />(ft bgs) <br />Sample Depths Anals <br />(ft bgs) Anatysis <br />40-55 5ft intervals <br />from 5 to 55 Lithology on y <br />_ <br />— MW-8 Monitoring Well 55 <br />MW-9 Monitoring Well 55 40-55 5ft intervals <br />from 5 to 55 Lithology <br />MW-10 Monitoring Well 55 40-55 5ft intervals <br />from 5 to 55 Lithology only — <br />OW-7 Ozone Injection <br />Well 48 46.5-48 2, 5, 10 TPHg, TPHk , <br />VOCs _ <br />SB-4 Boring 10 -- 2,5,10 TPHg, TPHk, <br />VOCs _ <br />CPT-1 Boring 80 -- -- -- In-situ MIP-HTP <br />analysis <br />CPT-2 Boring 80 -- -- -- In-situ MIP-HTP <br />analysis <br />TPHg=total petroleum hydrocarbons as gasoline; TPHkTPH as kerosene; VOCs=yolatile organic compounds; <br />M1P-HPT= membrane interface probe and hydraulic profile tool <br />KARL E. LONGLEv ScD, FE., CHAIR I PAMELA C. CREEDON '.E., BCEE, EXECUTIVE OFFICER <br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 I wwwwaterboards.ca.govicentralvalley <br />Ca RECYCLED PAPER