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0\0 <br />EDMUND G. BROWN JR. <br />GOVERNOR <br />CALIFORNIA <br /> <br />MATTHEW RODRIOUEZ <br />SECRETARY FOR <br />ENVIRONMENTAL PROTECTION Water Boards <br /> <br />Central Valley Regional Water Quality Control Board <br />16 July 2018 <br />Joshua Hernandez-Zavala <br />San Joaquin County General Services — Capital Projects <br />44 N. San Juaquin Street #590 <br />Stockton, CA 95202 <br />PUBLIC WORKS, 1810 E. HAZELTON AVENUE, STOCKTON, SAN JOAQUIN COUNTY, <br />CASE #390489 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the following documents, submitted on your behalf by Condor Earth Technologies Inc. <br />(Condor) for the San Joaquin County Public Works unauthorized petroleum release at 1810 E. <br />HazeIton Avenue in Stockton (Site): <br />Additional Subsurface Investigation and Well Installation Summary Report (Investigation <br />Report), dated 28 June 2018 <br />Semi-Annual Groundwater Monitoring Report - January 1, 2018 through June 30, 2018 <br />(2Q18 GMR), dated 29 June 2018 <br />In the 2Q18 GMR, Condor details May 2018 groundwater sampling activities and the resultant <br />findings. In the Investigation Report, Condor details the advancement of soil and groundwater <br />borings B-4, CPT-1, and CPT-2, and the installation of monitoring wells MW-8 through MW-10 <br />and ozone injection well OW-7. The boring/well details are summarized in Table 1 below, and <br />current groundwater data is summarized in Table 2 below. <br />Table 1 — Borin /Well Com letion Summa <br />Boring/ <br />Well <br />Total <br />Depth <br />(ft bgs) <br />Screened <br />Interval <br />(ft bgs) <br />Soil Sampling <br />(ft bgs) <br />Grab <br />Groundwater <br />Sampling <br />(ft bgs) <br />Purpose <br />B-4 11 -- 3, 7, 10 — Shallow soil assessment <br />CPT-1 94 -- -- 53, 77 Lithologic logging, and soil and <br />groundwater assessment CPT-2 94 -- -- 55 <br />MW-8 51.5 35-50 -- Ozone remediation Compliance Zone <br />monitoring <br />MW-9 51.5 35-50 — -- Ozone remediation Transition Zone <br />monitoring MW-10 51.5 35-50 -- <br />OW-7 44 41.5_43 2 ' 5 ' 10 ' 15.5, <br />20, 25.5 -- Ozone injection <br />ft bgs=feet below ground surface <br />KARL E. LONGLEY ScD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 I www.waterboards.ca.govicentralvalley <br />Ct RECYCLED PAPER