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Supplemental Calculations foosure Review Q September 8, 2011 <br /> Former BP Station No.-j,11.193 . 3202 West Hammer Lane,Stockton, CA <br /> of 6.3 ug/L (well MW-9); 1.5 ug/[., (well MW-11), and 4.7 ug/L (well MW-4): Therefore, three' <br /> discrete volumes were determined. Based on the assumptions of the calculated areas, a vertical <br /> impact zone of 1.8 to 23 feet depending on the well, and an assured porosity of 30 percent, the j <br /> estimated mass of MTBE remaining in the dissolved phase is appfoxirriately 0.01 pounds (see <br /> attached calculations). <br /> The calculations presented in this document are based on Site conditions, data, and'other <br /> information furnished to Closure Solutions by Atlantic Richfield Company; SJCEHD, and as <br /> available on the GeoTracl<er website as of the date of this correspondence. Closure Solutions <br /> has relied on this information as furnished, and is neither responsible for nor has confirmed the <br /> accuracy of this information. ti <br /> If you have an uestions regarding this submission lease contact the undersigned at 916) <br /> Y Y9_ g g . , P g (� <br /> 760-7236 (dfoley@closuresolutions.com) or Ms. Kathleen Waldo. at (916) 760-7025 <br /> (kwaldo(cvclosuresolutions.com). <br /> Sincerely, <br /> �pNAL G <br /> Closure Solutions,Inc. Q��S FOTO <br /> moo. DAVID <br /> FOLEY <br /> Na. 7815 <br /> David M. Foley, P.G. <br /> Senior Geologist <br /> Attachments: <br /> Attachment A Estimate of Residual Mass Calculations <br /> 4 of4 <br />