ARCHIVED REPORTS_SITE CHARACTERIZATION WORK PLAN

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near existing well TO/R-2R (B Zone, C Zone, and D Zone wells), west of Buckeye well AR/MW-5A (B Zone and C Zone wells), west of Buckeye well AR/MW-8A(B Zone and C Zone wells), near existing well TO/R-5R (B Zone, C Zone, and D Zone wells), near existing well TO/R-3R (B Zone and C Zone wells), near existing well TO/WC-2B (C Zone well), and south and east of existing well TONT-2R (B Zone, C Zone, and D Zone [east] wells). Lithologic samples will be continuously collected from the C Zone wells west of AR/MW-8B and AR/MW-5A, the C Zone well near existing wells TO/R-3R and TO/WC-2B, the D Zone wells near TO/R-2R and TO/R-5R, and the D Zone well east of TONT-2R. Soil samples will be collected at 2.5 and 5 feet bgs, and 0.5 to 1 feet above the soil/water interface (7.5 to 10 feet bgs) from the seven (7) borings listed above, and submitted for laboratory analyses. The sixteen (16) soil boring locations will be cleared with a hand auger to a depth of 5 feet bgs. All soil samples will be field screened using a PID for the presence of VOCs. The PID will be calibrated to 100 ppm isobutylene (volatile hydrocarbons). PID results will be recorded in the site field logbook. The samples for TPH-g and gasoline range VOCs will be collected using a laboratory-supplied USEPA Method SW5035 field extraction kit. A log of soil samples from each boring will be prepared in the field by either a California P.G., or a geologist working under the supervision of a California P.G., Boring logs will include the project name and location, name of the drilling contractor, drilling method, sampling method, soil sample depths, and descriptions of the soils encountered. Subsurface lithology will be described consistent with ASTM D2488-84, Standard Practice for Description and Identification of Soils (Visual-Manual Procedures). A copy of ETG's standard boring log is presented in Appendix A. During drilling activities, the split tube sampler will be decontaminated between each sample and between borings. Hollow-stem auger flights and other downhole equipment will be decontaminated between borings. Upon reaching the desired total depth, monitoring wells will be installed in each boring in accordance with California Well Standards Bulletin 74-90. Each monitoring well will be constructed of 2-inch diameter, schedule 40 flush threaded polyvinyl chloride (PVC) blank casing and 5 to 10 feet of machine-slotted 0.010-inch slot screen. Stainless steel centralizers will be installed in each C and D zone well to ensure the casing remains straight during placement of the filter pack and annular seal. The top of the well casing shall be capped with a J-plug type locking well cap and locked with a weather resistant padlock. A filter pack of#3, or equivalent, silica sand will be placed from approximately 6 inches beneath the casing end-cap to approximately 2 feet above the top of the well screen. An approximately 1-foot thick fine sand layer may be placed above the filter pack to prevent the downward movement of the seal into the filter pack. A minimum three foot thick transition seal of bentonite may be placed above the filter pack and hydrated. Sampling and Analysis Plan-Final 5/18/2012 2-3