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' Stockton Promenade—N.Edison bTreet USTs& Utility Corridors • Page 10 Underground Storage Tank Removal Report June 8,2009 WKA No, 1145.09 6.0 FINDINGS Four USTs were identified and removed from a narrow access corridor area between the Stockton Channel and the WOTOA parking lot during the construction of the Stockton Promenade. The four USTs were removed under permit, including confirmation soil sampling ' analysis. Results of the UST removals identified four tanks of different construction and condition. Details of the four removed USTs are provided below. ' • Tank#1 was approximately 1,200 gallons in capacity and of a riveted design, which was typical of pre-World War II tank specifications. The size, design, and location of Tank ' #1 matched a 1918 City of Stockton resolution allowing the Standard Oil Company to install an underground tank at the intersection of Tuleberg Levee and N. Edison Street. Tank#1 was identified to be partially full with a heavy petroleum fuel/oil mixture, and ' was also observed to have visible holes and corrosion damage. • Tank#2 was approximately 550-gallons in capacity and was the smallest of the four USTs removed during this scope of work. Tank#2 was also the only tank discovered to be filled with soil and without visible holes. Tank#2 was positioned within a few inches ' of Tank#1, but at a slightly different alignment and depth. This tank was galvanized coated on the inside and the end caps were of a crimped design. • Tanks #3 and 4 were of similar size, construction, condition, and appeared to be aligned together at the same depths. Tanks#3 and 4 were of welded design, were damaged across the tops, and contained visible corrosion holes. Tanks #3 and 4 were identified to ' be partially full with a heavy petroleum fuel/oil mixture. ' Sampling and analytical results compiled during this assessment are divided into three groupings: confirmation sampling beneath the former USTs, exploratory test pits, and direct- push sampling. Analytical results are summarized below based on each sampling area. Tables 1 through 3 and Figure 4 provide a detailed summary of the analytical results. Laboratory analytical reports are included in Appendix G. 6.1 UST Confirmation Sampling Results A total of eight soil samples were collected from the former UST locations, and three soil ' samples were collected from the resulting stockpiles of excavated soil from these areas. One water sample representing the rinsate from Tank#1 was also collected.