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Ca AVIN NEwSCM <br /> { GOVERNOR <br /> x <br /> CALIFORRIA SEJARC EDTABRY FORNFELD <br /> Water Boards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 5 July 2021 <br /> Jenny Salinas <br /> Koppel Stockton Terminal <br /> 155 Grand Avenue, Suite 800 <br /> Oakland, CA 94546 <br /> REVIEW OF 20-YEAR SOIL SAMPLING WORK PLAN, KOPPEL STOCKTON <br /> TERMINAL, 2025 WEST HAZELTON AVENUE, STOCKTON, <br /> SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> have reviewed the 20-Year Soil Sampling Work Plan (Work Plan) for the Koppel <br /> Stockton Terminal located at 2025 West Hazelton Avenue in Stockton, San Joaquin <br /> County (Site). The Work Plan was submitted by Jacobs Engineering Group Inc. <br /> (Jacobs) on behalf of the Koppel Stockton Terminal, and is consistent with the 20-year <br /> evaluation established in the 2000 Remedial Action Plan (2000 RAP) and as discussed <br /> with Central Valley Water Board staff in March of 2021. Since the inception of the 2000 <br /> RAP, Jacobs and its predecessors have conducted soil assessments on a 5-year basis. <br /> In summary, the Work Plan suggests collecting and analyzing composite soil samples <br /> for nitrate and ammonia compounds to characterize the 20-year effectiveness of the <br /> phytoremediation project approved in the 2000 RAP. Jacobs continues to sample <br /> groundwater and report conditions annually, consistent with Monitoring and Reporting <br /> Program No. R5-2017-0820 (the MRP). <br /> The Site is currently used to store bulk fly ash. Between the 1950s and 1990s, a <br /> warehouse and bagging facility at the Site were used for bulk dry fertilizer storage and <br /> distribution. It is generally understood that poor containment of fertilizer during this time <br /> period is the primary source of nitrate and ammonia in soil and groundwater at the Site. <br /> The Site consists of five defined areas: the test grove, turnaround area, stormwater <br /> pond, area north of plantings, and former bagging plant. In January of 2014, Central <br /> Valley Water Board staff concurred that no further action was necessary in the <br /> stormwater pond area. However, nitrate concentrations in groundwater did not support <br /> closure for the remaining portions of the Site. Central Valley Water Board staff and <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br /> 11020 Sur Center Drive#200,Rancho Cordova,CA 95670 I www.waterhoardr.ca.gov/contralvalley <br /> RECYCLED PAPER <br />