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at the bottom of the deepest sump. The depth of the sump was 7.5 feet below the top of the <br /> retaining wall (4.5 feet bgs) and the sample was collected an additional 1.9 feet below this depth. <br /> The soil did not exhibit any evidence of contamination as no staining or odor was observed in the <br /> field. Samples were collected in clean brass tubes, immediately capped on both ends with teflon <br /> tape and plastic caps, and put on ice in a cooler. The samples were submitted to Sequoia <br /> Analytical (FLAP# 1210) of Redwood City, California for analyses for pH, aluminum, lead, and <br /> sulfate. Due to the elevated pH level of sample TP-4, OIT requested that the samples also be <br /> analyzed for calcium, and sodium. The calcium concentrations in the sample from TP4 was one <br /> order of magnitude higher that the other samples. Copies of field notes and laboratory data sheets <br /> for the soil samples are included in Attachment 2. <br /> Closure has been completed in accordance with the Closure Plan and the Closure Plan meets or <br /> exceeds the requirements of 67450.3(c).12(G). <br /> I certify under penalty of law that this document and alrattachments were prepared under my direction or <br /> supervision in accordance with a system designed to assure that qualified personnel properly gathered and <br /> evaluated that information submitted. Based on my inquiry of the person or persons who managed the <br /> system, or those persons directly responsible for gathering information, the information is, to the best of <br /> my knowledge and belief, true, accurate,and complete. I am aware that there are significant penalties for <br /> submitting false information, including the possibility of fine and imprisonment for knowing violations. <br /> If you have any questions regarding these closure activities or need additional information, please <br /> contact Smith Environmental at (209) 579-2221. <br /> Sincerely, <br /> William Madison, Geologist . Jeffrey Braden, General Manager <br /> Smith Environmental Technologies Corp. Olin Interconnect Technologies <br /> QRpFESSlpf�,9 <br /> JEANNE <br /> q HOMSEY <br /> Jea a Homsey, CA Reg. eivil Engineer 447410 c= No.C047410 <br /> Smith Environmental Technologies Corp. Exp. 17-199 <br /> J> CIVIL \2 <br /> cc: Ms. Linda Turkatte, San Joaquin County Environ4rF t vision <br /> Ms. Astrid Johnson, Section Chief, DTSC <br /> Mary L. Clark - Olin Corporation, Charleston, TN <br /> Mr. Jim Cook, Olin Interconnect Technologies, Mantec, CA <br /> Attachments <br /> w:�95136gLDTSC.dm 2 SMTH <br />