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CITY OF STOCKTON FIRE <br /> DEPARTMENT. <br /> FIRE PREVENTION DIVISION <br /> Tank Abandonment Site AssessmentLTIAEPTA <br /> NuStar Stockton Terminal <br /> 3505 Navy Drive BASED bN INFORMATION SHOWN <br /> Stockton , CA SUBJECT°TO INSPECTIONS & TESTS <br /> May 20 , 2020 <br /> By: P . Simon_ pate, 10/19/2020 <br /> The following work plan details activities designed to evaluate subsi, e o d ' <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 locatepotential 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 />