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`r Wprk Plan for Site Assessm"nt Former Texaco Service Station Chevron Site ID 309075 r.. September 30, 2009 L 2.3 REGIONAL GEOLOGY/HYDROGEOLOGY The Stockton area is underlain to a depth of approximately 150 feet below grade by Holocene r age alluvium and the Victor Formation, which is comprised of unconsolidated Quaternary age deposits. These formations are heterogeneous consisting of laterally discontinuous lenses of sand and gravel with varying amounts of sand and silt interstratified with units of clay and silt. V Surface water bodies present in the vicinity of the site include Morman Slough, located approximately 3,000 feet to the north, and Walker Slough located approximately 6,000 feet to the south. 3.0 PROPOSED SCOPE OF WORK I.r ARCADIS will supervise the advancement of one cluster of shallow and deep soil borings, down gradient of groundwater monitoring well MW-1, at the locations shown on Figure 2. The soil borings will be completed as groundwater monitoring wells to evaluate the down gradient extent of petroleum hydrocarbon impacts to soil and groundwater at the onsite shallow and deep water-bearing zones. The proposed deep monitoring well will be double cased to minimize the potential for cross contamination between the shallow and deep water-bearing zones onsite. 3.1 SITE SPECIFIC E-HASP As required by the Occupational Health and Safety Administration (OSHA) "Hazardous Waste `r Operations and Emergency Response" guidelines (29 Code of Federal Regulations Section 1910.120), and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (California Code of t✓ Regulations Title 8, Section 5192), ARCADIS will prepare a site specific environmental health and safety plan (E-HASP) prior to commencement of field work. The field staff and contractors will review the E-HASP prior to beginning field operations at the site. V 3.2 PERMITTING All applicable permits will be obtained from the SJCEHD and the City of Stockton as necessary, prior to commencing field activities. 3.3 UNDERGROUND UTILITY LOCATING Underground Service Alert (USA) will be notified a minimum of 48 hours prior to commencing field activities to identify any public utility alignments that may be in conflict with the proposed borings. In conjunction with the USA, a private utility locating company will be utilized to further evaluate the boring locations relative to underground utilities. Locations may require field modifications due to onsite utility locations and/or field conditions. V \\arcadis-us\officedata\Sacramento-CA\ENV\CHEVROM30907516 Deliverables\Work Plan\Downgradient Wells\Work Plan for Downgradient Weils_379910950.doc 2 tr