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■��,`I xWill NC <br /> 10 INTRODUCTION <br /> In accordance with the of San Joaquin County Public Health Services, Environmental <br />' Health Division (PHS/EHD), as presented in their letter of May 25, 1993, Versar, Inc (Versar) <br /> has prepared this Quarterly Groundwater Monitoring report for the Stockton Army Aviation <br /> Support Facility at 2000 Stimson Road in Stockton, California (Site) This report was prepared <br />' on behalf of the State of California, Division of the State Architect(DSA), under Standard <br /> Agreement UT 058R dated October 18, 1994, Work Order MAR 340 dated April 15, 1996, and <br />' Versar Quote number 95-8719 The purpose and scope of this work was detailed in a report <br /> titled, Site Investigation Workplan, dated August 2, 1995 <br /> Versar's quarterly groundwater monitoring included the following tasks <br /> • Record water-level measurements from groundwater monitoring wells MW1, <br /> MW2, and MW3 and calculate the groundwater flow direction and gradient, <br /> • Purge and sample groundwater in monitoring wells MW1, MW2, and MW3, <br />' 0 Submit the groundwater samples to a certified laboratory for analysis for total <br /> petroleum hydrocarbons as JP4 het fuel (TPH-JP4), methyl tertiary butyl ether <br /> Fb (MTBE), and benzene, toluene, ethylbenzene, and total xylenes (BTEX), and <br /> • Summarize the data and produce 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 />' storage tanks and dispensers, respectively These USTs are currently active and store JP4 The <br /> majority of the Site is covered with asphalt or concrete pads There are three groundwater <br /> monitoring wells on Site, as shown on Figure 3 <br />' 1.2 Geology <br /> The Site is located in the northern part of the San Joaquin Valley, which is composed of <br /> unconsolidated Quaternary sediments from alluvial and lake deposits The alluvium is the result <br /> 1 of the erosion of the foothills of the Sierra Nevada mountains to the east The Sierra Mountain <br /> Range is composed of a wide variety of rock types, including granitic, metamorphic, and <br /> H IPROJECTSIDSAISTOCKTONI4THIFINALIREPORT FL 1 <br />