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Remedial Action Plan RE: 425 W. Larch Street, Tracy, CA October 1 , 2008 W&A Project No. : FTIM-08-002 Summary of Remedial Alternative Casts Frontier Transportation, Inc. 425 W. Larch Road Tracy, CA 95376 Remedial Alternative Assumptions Cost Monitored Natural Attenuation Due to the current lack of declining trends 1 . Quarterly monitoring, sampling, and (MNA) at wells, an additional 20 years of reporting (20 years). Cost per quarter is quarterly monitoring/reporting is assumed estimated at $6,000 for quaterly sampling and $6803000 to be needed to reach acceptable goals. analysis and $2,500 for reporting. No additional well installations are TOTAL $680,000 Excavation & Existing above-ground structures will not 1 . Design, Permitting $30,000 Disposal of Soil be demolished. Proposed dimensions of 2 Soil Excavation, Transportation, & Disposal $520,000 the excavation would be approximately 200x8Oxl5 feet (depth). Volume of soil to 3 . Backfilling and compacting $200,000 be disposed is approximately 8,900 yd 3. 4. On site laboratory (10-days) $25 ,000 Groundwater concentrations are 5 . Re- install wells $70,000 anticipated to decline to cleanup goals 6. Monitoring Cost (3 years) $102,000 within 3 years following excavation; hence monitoring/sampling/reporting costs are TOTAL $947,000 estimated for a total of 3 years. Soil Vapor Extraction and Based on the distribution of impact, 1 . Design, Permitting $ 8,500 Abatement (SVE) existing wells will be used for SVE. Cost 2. Equipment and Construction $ 140,000 of utilities is based on a 250 cfm thermal 3 . Life Cycle (O&M-2 year) $487000 oxidizer with 10 hp blower. Post remedial 4. Laboratory Cost (O&M-2 year) $ 155000 �- groundwater 5 . Utility Cost (O&M-2 year) $72,000 monitoring/sampling/reporting for an 6. Monitoring Cost (2 yr + 8 yrs) $3405000 additional 8 years after completion of SVE is assumed. TOTAL $623,500 LNwiaer , ntu 6 assuctares. INC.