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September 17, 1993 Skobrak Property, Stockton, California 4.0 PROPOSED WORK PHASE II 4.1 Methods and Procedures To further assess the potential extent of soil and groundwater impaction, RESNA proposes to drill and sample a total of five soil borings at the site, four of which will be converted to ' groundwater monitoring wells The proposed boring/well locations are plotted on Figure 3 ' Three soil borings will be advanced in the vicinity of the former Tank A location to assess soil contaminants detected in those areas during RESNA's Phase I assessment These borings will ' be completed as groundwater monitoring wells The proposed groundwater momtonng wells will be positioned to further define the lateral extent of documented soil and potential groundwater contamination and determine the direction of groundwater flow beneath the protect ' site Two soil borings will also be advanced in the vicinity of the southern Tank B and C excavation, one of which will be converted into a groundwater monitoring well, to further define the extent ' of soil and groundwater impaction near these tanks ' All field activities will be conducted in accordance with a Site Safety Plan (SSP) adhering to OSHA 29 CFR 1910-120 requirements and an approved Quality Assurance/Quality Control (QA/QC) Plan as required by Tri-Regional guidelines (RWQCB, August 1991) The SSP and QA/QC plans will be submitted to PHS/EHD prior to initiating field work The field work will ' be conducted under the supervision of a California Registered Geologist ' 4.1.1 Drilling Proposed soil borings will be advanced to the depth of saturation, approximately 30 feet below ' grade Four borings will be converted to groundwater monitoring wells by further advancing the boring to a total depth of approximately 45 feet below grade, or 15 feet below the depth where groundwater is first encountered WP-(N93 DRF 3