ARCHIVED REPORTS_QUARTERLY MONITORING AND REMEDIATION REPORT - FIRST QUARTER 2007

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Site Background Information THATER PROPERTY (former TUCKER CONSTRUCTION) 336 East Locust Street,Lodi, California The site is located at 336 East Locust Street in Lodi, California(Figure 1). Currently, a residential home is under construction on the property. Two 1,000-gallon gasoline underground storage tanks (USTs)were removed from the site in the mid 1980s. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING According to Geologic Map of California,published in 1977 by the State of California Department of Mines and Geology, the site area is located within the Great Valley Geomorphic Province of California(GVGP). The GVGP is a nearly flat,elongated structural trough trending northwest and southeast for approximately 450 miles;it is bounded on the east by the Sierra Nevada mountains and on the west by the Coast Ranges. The GVGP has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The surficial and upper several hundred feet of subsurface layers consists of a great thickness of predominantly unconsolidated alluvial and flood plain deposits(primarily sands,silts, and clays) of Quaternary age,which are derived from the granitic mountains of the Siena Nevada. Beneath the upper sedimentary deposits lies a thick sequence of marine deposits of Mesozoic age. These marine deposits are further underlain by a pre-Jurassic complex of igneous and metamorphic basement rock. The GVGP is subdivided into two major divisions, designated the Sacramento and San Joaquin Valleys.The site is located in the San Joaquin Valley,which is drained primarily by the San Joaquin River; the Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin(Basin 5-22). The nearest surface water feature in the vicinity of the property is the Mokolumne River, located approximately 0.8 miles north of the site. Based on the United States Department ofAgriculture-Natural Resources Conservation Service's Web Soil Survey map, surface sediment at the site area is classified as Tokay-Urban land complex. The Tokay Series consists of very deep,well drained soils that formed in alluvium derived mainly from granitic rock sources. Tokay soils are on low fan terraces. The estimated depth to ground water at the property is approximately 30 feet to 35 feet below surface grade (bsg), based on the map titled Lines of Equal Depth to Groundwater Spring 1996 published by the San Joaquin County Flood Control District and Water Conservation District (FCD&WCD);however,data collected during quarterly ground water monitoring events at the site indicate depth to ground water is approximately 50 feet bsg. The map entitled Lines of Equal Elevation of Groundwater Spring 1996, also published by the FCD&WCD, shows the property to be in an area where ground water flows toward the south and southwest,but this may be modified by changing recharge and discharge patterns.Ground water is considered to be ofbeneficial use and Advanced GeoEnvironmental,Inc.