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1.0 INTRODUCTION On behalf of the Stockton Metropolitan Airport, Chevron Products Company, and A.G._Sp no Companies, Ramage Environmental, Inc. has prepared this semi-annual Groundwater Monitoring Report, First doff 2011 for submittal to the San Joaquin County Environmental Health Department and the Central Valley Regional Water Quality Control Board . ' Site Location and Description The site is an inactive aviation feeling facility located on the northwest corner of the intersection of C.E. Dixon Street and Lockheed Court within the Stockton Metropolitan Airport property in San Joaquin County, California Figure 1). A total of 20 underground storage tanks (UST) have been removed from the site: The locations of the former USTs are shown on Figure 2, and a list of the former tanks is included as Table 1: 1.2 Previous 12.1 LIST Removals Between August 1987 and May 1990, sixteen 1 USTs were removed from the site,. Twelve of the UST (Tanks 1-12) were 25,000 gallon capacity tanks for the storage of aviation gasoline and jet fuel, and were anchored to a concrete slab at'a depth of approximately 16 feet below ground surface hg • One of the USTs (Tank 1 was a 12,000 gallon tank used'to store unleaded gasoline. Three of the USTs (Tanks 21, 22, and 2 were 1,000 gallon tanks used to store aviation gasoline and jet fuel. Soil samples collected from beneath the former USTs USTindicated that the sail beneath the fuel farm had been impacted by petroleum hydrocarbons. The soil sample analytical results are summarized in Table 2* On Mune 19, 1997, RAH nvironmental removed the four remaining LISTS (Tanks CA-1, - CA-3, and Tank 14). Soil samples collected from beneath these LISTS also contained petroleum hydrocarbons. These sail sample analytical results are also summarized in Table 2, 1.2.2 PreliminaU Inve tl eti n and Evaluation On March 26, 1096, IT Corporation published Site Investigation Re wort, which documented the results of soil and groundwater-grab sampling from two on-site t eoprobe soil borings (SB-3 and SB-4). Two additional soil borings -1 and SB-2)were terminated at the buried d concrete slab beneath the former USTs. The boring locations are shown on Figure 2. 3