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2302 LARKIN CIRCLE <br />SPARKS, X5073NEVADA 89431-6587 <br />P.O. BOX 50730 SIERRA CHEMICAL CO. <br />SPARKS, NEVADA 89435-0730 <br />TELEPHONE (775) 358-0888 <br />FAX (775) 358-0987 March 1, 2006 <br />E-MAIL sierrachem@gbis.com <br />Via Fax (209) 463-3433 <br />Kasey Foley, Lead Senior REHS <br />San Joaquin County <br />Environmental Health Department <br />304 East Weber Avenue, 3rd Floor <br />Stockton, CA 95202-2708 <br />RE: Soil sample test program for area of anomalous chromium analysis. <br />Dear Ms. Foley, <br />As confirmation of our recent telephone conversation the following is my understanding <br />of the procedure that will be followed to further test the area. <br />1. The area is currently flooded with water due to the recent rains. Following the <br />area drying to the point it can be sampled we will contact you to check on your <br />availability to be present during the sampling. Sampling will not take place <br />without your presence. <br />2. A grid will be established and distinct samples will be collected and split. <br />3. One split will be provided to you. Sierra Chemical will provide the other split <br />under proper chain of custody documentation to a California Certified lab for <br />CAM 17 metals analysis. <br />4. If any of the samples test above the permissible limits for any metal a STLC <br />analysis will be obtained for that metal. <br />5. If any areas are above California allowable limits a remediation plan will be <br />developed and agreed upon prior to any removal. <br />We will keep you informed on the moisture conditions of the site so this work can take <br />place as soon as possible. <br />If you have any questions or a different understanding of our conversation, please <br />contact me. I can be reached at (775) 358-0888. Thank you for your help in this matter. <br />9 0&— SPARES O BATTLEMOUNTAIN ®STOCETON <br />