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1krersefinc <br /> 1.0 INTRODUCTION <br /> 1 <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, 1993, Versar, <br /> Inc (Versar) has prepared, on behalf of the State of California, Division of the State Architect <br /> (DSA), under Standard Agreement UT 058R dated October 18, 1994, Work Order MAR 340 <br /> dated April 15, 1996, and Versar Quote number 95-8719, this Quarterly Groundwater <br /> Monitoring 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 /> Site Investigation Workplan, dated August 2, 1995 <br /> Versar's quarterly groundwater monitoring includes the following tasks <br /> • Recording water-level measurements from groundwater monitoring wells MW1, <br /> MW2, and MW3 and calculating the groundwater flow direction and gradient, <br /> • Purging and sampling of the groundwater in monitoring wells MWI, M <br /> W2, and <br /> IMW3 at the Site, <br /> • Submitting 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 /> (MTBE), and benzene, toluene, ethylbenzene, and total xylenes (BTEX), <br /> • Summarizing the data and producing this report <br /> 1.1 Site Location and Layout <br /> 1 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 JP-4 O et <br /> fuel) The majority of the Site is covered with asphalt or concrete pads There are three <br />' groundwater 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 /> of the erosion of the foothills of the Sierra Nevada mountains to the east The Sierras are <br /> H 1PROJECTSIDSAISTOCKTON13RD\REPORT FL 1 <br />