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1 <br /> Field activities were performed in accordance with the Tank Closure Plan for <br /> NAVCOMMSTA Stockton dated January 30, 1992, which was approved by the Navy and the San <br /> Joaquin County, Public Health Services, Environmental Health Division Riedel Environmental <br /> ' Services (Riedel Environmental) was subcontracted to perform all soil excavation, tank removal <br /> activities and backfilling activities Testing and Technology performed the tank integrity test on tanks <br /> ' 81713-1 and 81713-3 PRC professionals oversaw all activities and collected soil samples at the site <br /> Ms Pam Violet from the San Joaquin County Public Health Services, Environmental Health Division, <br /> ' was present during tank removal and soil sampling activities Throughout field activities, the area <br /> was secured with a chain link fence and barrier tape The specific field activities are described <br /> ' below <br /> Removal of Tank 81713-2 and Soil Sam lin <br /> Field activities began on April 2, 1992 In the absence of utility site plans, underground <br /> ' utilities were identified using visual cues such as vents, fill pipes, and pump locations Measurements <br /> of product amounts and depth to tank bottom of the UST were also taken at this time The liquid ' <br /> level inside the tank was measured to be 57 inches from the bottom of the tank The tank was <br /> measured by Navy personnel in early March and only 21/z inches of liquid were reported at that time <br /> ' The tank had not been filled with product since that time, as stated by Navy personnel on site, and the <br /> liquid appeared to be a water and product mixture Riedel Environmental requested a liquid pumping <br /> ' truck be sent from Dillard Trucking, Inc Excavation of the soil and asphalt pavement overlying <br /> Tank 81713-2 began The field team removed the asphalt pavement and soil above the tank to a depth <br /> ' of approximately 3 feet and to a depth of approximately 5 feet on the south side of the tank using a <br /> Koehring 6620 excavator (Appendix A, Photo 1) During excavation activities, a pipe was knocked <br /> ' loose from the top east end of the tank <br /> ' At this time photmonization detector (PID) readings began to range from 0 to >4,000 parts <br /> per million (ppm) adjacent to the excavation Work was stopped and ambient air concentrations were <br /> ' monitored for total volatile organics High concentrations continued to register on the PID, and read <br /> as high as 6,000 ppm adjacent to the excavation Concentrations were recorded to be as high as 200 <br /> ' ppm for extended periods of time near occupied buildings, therefore, all station personnel and field <br /> crew were evacuated from the site The NAVCOMMSTA Stockton fire department was called by <br /> station personnel and the excavation was sprayed with a vapor reducing foam (Appendix A, Photo 2) <br /> TANKRMU NEW <br /> ' D"162MATRi 5!14193 5 <br />