Laserfiche WebLink
' 10 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 1993 Versar, <br /> Inc (Versar) has prepared on behalf of the State of California, Division of the State Architect <br /> (DSA), this quarterly groundwater monitoring and soil stockpile sampling report for the Stockton <br /> Army Aviation Support Facility at 2000 Stimson Road in Stockton, California (Site) This work <br /> was detailed in a report titled Site Investigation Workplan, dated August 2, 1995 In addition <br /> this report presents the technical approach for the characterization and disposal of soils currently <br />' stockpiled on site <br /> Versar's quarterly monitoring includes the following tasks <br /> • Recording water-level measurements from the three groundwater monitoring «ells <br /> • Sampling of the groundwater in the three groundwater monitoring wells <br /> at the Site and laboratory analysis of the samples <br /> • Calculating the groundwater flow direction and gradient based on the water-Ievel <br /> measurements from the three groundwater monitoring wells <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 (Figure 1) <br /> Figure 2 shows the former location of three underground storage tanks (USTs) and associated <br /> dispensers To the south and east of the former USTs are one 15,000-gallon UST and two <br /> partially buried 20,000-gallon fuel storage tanks and dispensers, respectively These USTs are <br /> currently active and store JP-4 Oct fuel) The majority of the Site is covered with asphalt or <br /> concrete pads There are three groundwater monitoring 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 Serra Nevada mountains to the east <br /> The Sierras are composed of a wide variety of rock types that vary considerably in age and <br /> composition, including granitic, metamorphic, and volcanic rocks To the west of the valley are <br /> the Coast Ranges, composed of metamorphic rocks These mountains are highlighted by the <br /> Y IDSAIST0CKT0N\337200111 STQTR RPT I <br /> 1 <br />