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Michael N. Oliphant -2- 21 July 2011 <br /> Former Tracy Pump Station <br /> SAIC proposes the following: <br /> • Based on the analytical results, the approximate dimensions of the excavation will be <br /> 115 by 120 feet and 8 to 10 feet deep. The excavation depth will not exceed 10 feet. <br /> • The volume of affected soil to be removed will be approximately 4,000 cubic yards. <br /> • Affected soil removed will be transported to nearby Class II Forward or Altamont landfill <br /> for disposal. <br /> • Clean soil from a nearby source will be imported and compacted as backfill. Topsoil <br /> suitable for agricultural use will be placed on the upper one to two feet of the backfill. <br /> • A Remedial Action report including photographic documentation will be submitted <br /> during the fourth quarter of 2011. <br /> Central Valley Water Board staff has the following comments: <br /> • In the event additional petroleum hydrocarbon affected soil not previously noted is <br /> encountered during final excavation activities, the affected soil should be removed and <br /> additional confirmation samples collected for PAH determination. <br /> • The backfill and surface repairs should be consistent with the property owners' <br /> specifications. <br /> • If additional soil is removed, the revised estimate for the final excavation dimensions <br /> and the final volume of affected soil removed should be provided and results of other <br /> confirmation sampling included. <br /> Central Valley Water Board staff concurs with the workplan provided our comments are <br /> addressed. By 1 March 2012, please submit the RAP excavation report. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179 or <br /> by email: dhubbardC@waterboards.ca.gov. <br /> SHELTON R. GRAY D AN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 6357 <br /> cc: `Michael Infurna, San Joaquin County EHD, Stockton <br /> Gary Dobler, Tracy <br /> Michael Hurd, SAIC, Oakland <br />