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1 <br />' 1.0 INTRODUCTION <br /> In accordance with the requirements of San Joaquin County Public Health Services, <br />' Environmental Health Division (PHS/EHD), as presented in their letter of May 25, 199') Versar, <br /> Inc (Versar) has prepared, on behalf of the State of California, Division of the State Architect <br /> (DSA), under Standard Agreement UT 0 5 8 R dated October 18, 1994, Work Order MAR ;40 <br /> dated April 15, 1996, and Versar Quote number 95-8719, this Quarterly Groundwater <br /> Monitonng report for the Stockton Army Aviation Support Facility at 2000 Stimson Road in <br /> Stockton, California (Site) The purpose and scope of this work was detailed in a report titled, <br /> rSite Investigation Workplan, dated August 2, 1995 <br />' Versar's quarterly groundwater monrtonng includes the following tasks <br /> • Recording water-level measurements from the three groundwater monitoring <br /> wells, <br /> • Sampling of the groundwater in the three groundwater monitoring wells at the Site <br /> and laboratory analysis of the samples, <br /> • Calculating the groundwater flow direction and gradient based on the water-level <br /> measurements from the three groundwater monitoring wells, and <br /> • Summarizing the data and producing this report <br />' 1 1 Site Location and Layout <br />' The Site is located in the southern part of Stockton Metropolitan Airport at the Stockton <br /> Army Aviation Support Facility (AASF) at 2000 Stimson Road, Stockton, California The Site <br />' location is shown in Figure 1 The Site layout is shown in Figure 2, and includes the former <br /> location of three underground storage tanks (UST) and associated dispensers To the south and <br /> east of the former USTs are one 15,000-gallon UST and two partially buried 20,000-gallon fuel <br /> I storage tanks and dispensers, respectively These USTs are currently active and store JP-4 Oet <br /> fuel) The majonty of the Site is covered with asphalt or concrete pads There are three <br /> groundwater monrtonng wells on site <br /> 1.2 Geology <br />' The Site is located in the northern part of the San Joaquin Valley The Valley is <br /> composed of unconsolidated Quaternary sediments from alluvial and lake deposits This <br /> alluvium is the result of the erosion of the foothills of the Siena Nevada mountains to the east <br /> The Sierras are composed of a wide variety of rock types, including granitic, metamorphic, and <br /> 1 <br /> 1 <br />