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I <br /> Michael N. Oliphant -2- 21 July 2011 <br /> Former Tracy Pump Station <br /> SA1C 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 I <br /> ' p y 1 Forward or Altamont landfill <br /> for disposal. <br /> Clean soil from a nearby source will be imported and compacted ' <br /> ' Y p p ed 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 submied ' <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 r ' <br /> p the property owners <br /> specifications. <br /> If additional soil is removed the revised estimate for the ' <br /> ` 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: dhubbard waterboards.ca. ov. ' <br /> SHELTON R. GRAY ��C. D N 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 /> 1 <br />