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7h3adwe11&W10 <br /> • The groundwater gradient varies from approximately 0.01 feet per foot(ft/ft) at Area 10 to <br /> approximately 0.002 ft/ft at Area 15. The November 1999 quarterly groundwater monitoring <br /> reports prepared by AGE for areas 15 and 16 (Appendix B) show groundwater gradients of <br /> gradients of approximately 0.003 ft/ft and 0.0008 ft/ft respectively. <br /> 3.7 Demography and Land Use <br /> The study area sites are located in industrial/conunercial areas, south of the residential <br /> neighborhood that begins on the north side of Fremont Street. The residential area is comprised <br /> of predominantly single-family residences. No residences exist within the study area. <br /> 4.0 NATURE AND EXTENT OF CONTAMINATION <br /> The work performed during the study of the Stockton North Shore parcels confirms that soil and <br /> groundwater contamination, generally in the form of petroleum fuel hydrocarbons and metals, is <br /> • present at most sites in varying degrees. This study generally confirms the prior site <br /> characterization work. Low concentrations of SVOCs have been detected in soil at several sites, <br /> and in most cases appear to be related to petroleum fuel hydrocarbons. A summary of the <br /> findings of the field investigation for each site follows. <br /> 4.1 Environmental Impacts at Operable Unit 1 <br /> 4.1.1 Area 10 <br /> The primary contaminants of concern in soil at the Banner Island site are lead and petroleum <br /> hydrocarbons. Elevated concentrations of a limited number of other contaminants such as <br /> arsenic have been have been detected,but at concentrations far below the California hazardous <br /> criteria or the non-carcinogenic Preliminary Remediation Goals (PRGs) for industrial sites <br /> established by the USEPA. <br /> 25 <br /> 25970309.DGD 24 August 2000 <br />