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Tank Abandonment Site Assessment Work Plan <br /> NuStar Stockton Terminal <br /> 3505 Navy Drive <br /> Stockton,CA <br /> May 20,2020 <br /> The following work plan details activities designed to evaluate subsurface conditions adjacent to an <br /> existing underground storage tank (UST) and associated piping. The tank is a Xerxes double walled <br /> fiberglass 6,000-gallon capacity storage tank installed in 1987. The tank was used for the dewatering <br /> of petroleum tank bottoms from the on-site above ground storage tanks (AST's). The UST does not <br /> meet current UST spill containment regulations. There is no history of any unauthorized releases from <br /> this tank. The tank will be triple rinsed and all contents removed. The tank will subsequently be filled <br /> with 10 sack controlled density sand slurry and permanently closed. Prior to abandonment, soil <br /> samples and one ground water sample will be collected and analyzed to ascertain potential <br /> hydrocarbon concentrations prior to tank abandonment. <br /> SCOPE OF ACTIVITIES <br /> HEALTH AND SAFETY PLAN <br /> A site specific Health and Safety Plan detailing known or potential hazards and emergency response <br /> procedures will be prepared prior to field operations. All on-site personnel will review the plan and a <br /> "tailgate" safety meeting will be conducted prior to initiation of field activities. The plan will be <br /> maintained on-site throughout the duration of field activities. The plan will be modified if warranted <br /> due to on-site conditions. <br /> UNDERGROUND SERVICE ALERT NOTIFICATION <br /> Prior to conducting any subsurface activities, the areas to be investigated will be marked and <br /> Underground Service Alert(U.S.A.)will be notified to locate potential utility conflicts. <br /> DRILLING AND SAMPLING PROCEDURES <br /> A total of 2 geoprobe exploratory borings and 22 hand auger borings are proposed. Proposed boring <br /> locations are shown in Figure 1. The borings will be advanced to 5 feet below surface grade (BSG)for <br /> the hand auger locations and to 15 feet drilled depth (14' BSG) for the geoprobe borings. The borings <br /> were divided into two categories depending on the assessment goal associated with each boring. Borings <br /> designated PL-1, PL-2, etc. will be advanced to assess the product piping. Borings designated TP-1 and <br /> TP-2 will be advanced to collect soil samples and a ground water sample from the tank pit area. <br /> During the investigation standard practices and procedures for field sampling as outlined in <br /> Publication SW-846, Second Edition, United States Environmental Protection Agency will be <br /> followed. The work will be performed under the direct supervision of a California Professional <br />