COMPLIANCE INFO_FILE 1 - Laserfiche WebLink

Home Browse Search

3.1 TASK DEFINITION: The scope of the remediation project can be broken down into three major tasks: Task—1: Site Survey and boundary definition Task—2: Soil Excavation and stockpiling activities Task—3: Geoprobe drilling and sampling analysis ERS Corp will modify site-specific JHAs and the accompanying data sheets when: • The scope of work is changed by adding eliminating or modifying tasks • New methods of performing site tasks are selected • Observation of this performance of site tasks results in a revised characterization of the hazards • New chemical, biological, or physical hazards are identified • Exposure data indicate changes in the concentration and/or likelihood of exposure • New or different control measures are selected 3.2 Scope of Work for Tasks 3.2.1 Task 1: Permitting and Utility Clearance As described below, investigation activities consisting of collecting soil and ground water samples and drilling are planned for the Site. Permits for these activities will be acquired from the appropriate agencies at the County of San Joaquin and City of Stockton. Underground Services Alert (USA) will be notified and the boring locations will be cleared for underground utilities using a private underground utility locating subcontractor. The proposed drilling and excavation locations are contingent upon access limitations (i.e., site features,utilities) and final locations may be moved to the closest accessible location. 3.2.2 Task 2: Boring Advancement The borings will be advanced using hydraulic direct push equipment to approximately 20 feet bgs, which is anticipated to intercept ground water contained within the native silts and clays. In addition, borings C1, C9, and C10 will be advanced to approximately 35 feet. All drilling equipment will be decontaminated between each sampling location. 3.2.3 Task 3: Groundwater and Soil Sampling In the borings, soil samples will be collected continuously and described with regard to soil type, relative moisture, and color in accordance with the Unified Soil Classification System. In addition, possible volatile organic compounds emanating from the soil samples collected near the former USTs will be screened by placing the soil sample in a sealable plastic bag (e.g., zip- Environmental Risk Services,Corp.