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• S ECC? R 2.0 PROPOSED SCOPE OF WORK The proposed scope of work is to further define impacts to deeper groundwater in the vicinity of the L&M OU. The proposed scope of work included in this work plan consists of the installation and development of 17 deeper (B-, C-, and D-Zone) monitoring wells (Figure 3). As shown on Figure 3, these deeper wells will be strategically placed to fill potential data gaps in the current monitoring well network. In addition to providing lateral groundwater assessment data from three previously identified deeper monitoring zones, these wells will also provide additional assessment points for SPH historically reported beneath the site. Many of the proposed deeper wells are co-located with wells from the shallow monitoring zone to provide data for further assessment of the vertical groundwater gradient beneath the Site. The specific scope of work is discussed below: 2.1 Site Health and Safety Plan As required by the Occupational Health and Safety Administration (OSHA) "Hazardous Waste Operations and Emergency Response' guidelines (29 CFR 1910.120), and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response' guidelines (CCR Title 8, Section 5192), SECOR will prepare a site specific Health and Safety Plan (HASP). The field staff and contractors will review the HASP prior to beginning field operations at the site. 2.2 Well Monitoring and Installation 2.2.1 Permitting and Access Agreements Monitoring well permits will be obtained from the San Joaquin County Environmental Health Department (SJCEHD) prior to initiating work. Additionally, encroachment permits and access agreements with offsite property owners will be obtained as needed for particular wells prior to initiating the field effort. 2.2.2 Underground Utility Locating SECOR will notify Underground Service Alert (USA) a minimum of 48 hours prior to commencing subsurface activities so that existing underground utilities in the area of the proposed work can be located and avoided. In conjunction with USA, a private utility locating company will be utilized for clearing proposed boring locations. Prior to the onset of drilling, all borings will be cleared to a minimum depth of eight feet, one inch. 2.2.3 Deeper Zone Monitoring Well Installation Seventeen 2-inch diameter deeper zone groundwater monitoring wells will be installed at the locations shown on Figure 3. Five wells will be installed to a depth of approximately 50 feet bgs targeting the B-Zone where SPH was historically been observed. Seven wells will be installed to further assess the high permeability sand layer located from approximately 85 to 90 feet bgs Additional Deep Zone Assessment Work Plan.final.doc Tidewater Stockton March 14,2008 4