ARCHIVED REPORTS XR0001117 - Laserfiche WebLink

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2 BACKGROUND Page 2 ' 2. 1 SITE DESCRIPTION tThe site is located at 1045 West Charter Way, in Stockton, California A site location map is presented in Figure 1 A site location map showing the location of the site structure and limits of the excavation are presented in Figure 2 The property is located in an industrial area west of Highway 5, along West Charter Way, also known as Highway 4 The nearest surface water is the Stockton Deep Water Ship Channel,approximately one mile to the north The area is protected by dikes from surrounding the Stockton Deep Water Ship Channel waters The Stockton Deep Water Ship Channel waters are tidally influenced Groundwater is located at approximately 25 feet below mean sea level ' 2.2 SITE HISTORY ' A Phase I Preliminary Hazardous Materials Site Assessment (PSA) was prepared by Kleinfelder of Sacramento, California, and dated November 16, 1988 The PSA was prepared for Nomelhni Construction Company, Inc , a construction and tool rental operator Three underground storage tanks (USTs) formerly located at the subject site were removed in August, 1988 The tank numbers, sizes, contents and histories were as follows two 1,000 gallon fuel tanks (containing regular and unleaded gasoline, respectively) were excavated from an area bordering Charter Way and southeast of the warehouse building One 550 gallon waste oil ttank was excavated from a separate site The subsurface investigations that followed related to the presence of the two 1,000 gallon fuel tanks The tanks were reported to have stored unleaded gasoline and they may also have held kerosene at one time Analytical results of soil samples collected beneath the tanks indicated that petroleum hydrocarbons and gasoline related constituents were present in the soil beneath the two 1,000 gallon tanks Kerosene was not detected in the sods Constituents were detected below levels of concern in the sample collected beneath the waste oil tank Results of this investigation were presented in a Kleinfelder report dated ' September 22, 1988 According to the Kleinfelder Report dated June 14, 1989, additional soil was removed from the fuel tanks excavation on November 9, 1988 to furthei assess the extent of petroleum hydrocarbon contamination One section of the former tank pit excavation floor was removed from a depth of 11 to 19 feet below the ground surface Soil samples were screened for organic vapors using a photoionization detector(PID) Organic vapor readings were detected at 408 parts per million (ppm) from a sample collected at a depth of 19 feet within the former tank pit and 740 ppm from a 100 Shoreline Hwy, Suite 295 B • Mill Valley, CA 94941 • (415) 381-6456 FAX (415) 389-0423