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Work Plan Facility Demolition and Soil Excavation .r Stockton,California Sierra-Pacific Project No.95-128.06 sufficiently to preclude displacement of structures and ground failures. In general, Sierra-Pacific will require a 1:1 setback from foundations. 3.7 Agronomic Application Pending regulatory approvals, product-bearing soils will be agronomically applied. It is estimated that the average concentration will be about 500 ppm N, where N consists mostly of reduced forms. Application rates will be calculated on the basis of rates recommended in the Western Farm Handbook, published annually by the California Fertilizer Association. 3.8 Backfilling and Compaction Class II aggregate base material (ABM) will be placed in one-foot lifts and compacted by wheel- rolling. Water spraying may be necessary to moisturize soils to optimum levels to achieve proper compaction. No engineering testing will be done to confirm density of backfilled material at this time. Soil density tests may be required later, depending on the ultimate use of the property. 3.9 Confirmation Soil Sampling Approximately 10 impact (steel tube) samples will be collected to confirm in-situ N levels. The confirmation soil samples will be taken at 6- to 12-inches bgs, and the uppermost six inches of soil will be removed before driving impact samples. Brass tube (confirmation) samples will be sealed with Teflon® tape and plastic end caps, then placed in an iced cooler. Appendix A presents the soil sampling methodology that Sierra-Pacific will implement during this project. To avoid cross-contamination, sampling tools will be washed in an Alconox solution and thoroughly rinsed with potable water before each sampling event. Sampling tools will be air dried and placed on clean plastic sheets. Sierra-Pacific's Quality Control and Quality Assurance Program is presented in Appendix B. Sierra-Pacific Groundwater Consultants, Inc. 7