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4.1.2 Soil Boring, Classification, Field Screening, and Sampling The locations of the borings are proposed to help determine if the subject property has been impacted by the historic use of USTs. The conceptual site model takes into consideration the potential distributions of contaminants with respect to the property's behaviors, fate and transport characteristics of the contaminant in a setting such as that being assessed. The sampling plan was designed to provide for the collection of potentially contaminated environmental media, if they occur, at locations or as close to locations and depths where the highest concentrations are likely to occur. All borings will be advanced by a licensed C-57 contractor. The boreholes will be performed using a mobile Geoprobe 6600 boring rig. The rig will advance nominal two- inch outside diameter Geoprobe casings with cellulose acetate butyrate (CAB) liners. The borings will be logged in accordance with standard geologic procedures by a qualified geologist or engineer. A total of 6 soil samples are anticipated to be submitted for chemical analysis. A section of the CAB liner, approximately 4 to 6 inches will be cut, ends sealed with Teflon patches and covered with plastic end caps. The soil samples will be labeled, recorded on the chain of custody, and immediately placed into a pre-cooled ice chest at approximately four degrees Centigrade. Proper chain-of-custody protocol will be followed at all times. A copy of the field data sheet, results of sample analyses, and chain-of-custody forms will be included in the appendices of the technical report. Equipment Decontamination & Waste Many e Non-dedicated sampling equipment will be decontaminated prior to use, and following sampling by: 1) washing with trisodium phosphate (Alconox) solution, with an exterior rinse; 2) rinsing the interior and exterior of the sample equipment with tap water; 3) followed by an internal and external deionized water(DI) wash. All soil generated during sampling will be stored on-site in an area generally lacking public access. Disposal alternatives will be evaluated based on the results of soil analysis. Borehole Abatement All borings will be abandoned by filling the annulus with a neat cement slurry to approximately 5 inches below grade and finished with matching surface material (asphalt, concrete, or native material). All work will be done in accordance with San Joaquin County Ordinance, California State Department of Water Resources Bulletin 74-81, 74-90, and subsequent bulletins, and the conditions of the Permit Application, including any conditions which may be added or changed by SJCEMD upon review of the Application and issuance of the Permit. 04117124 A&M ENVIRONMENTAL SERVICES 3 Work Plan for Site Investigation 1537 N. Wilson Way, Stockton, CA