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• to the lab report) and relatively old. The absence of MTBE is consistent with these <br /> results: MTBE was not in widespread use before the mid-1990's. <br /> Soluble lead was detected at a concentration of 0.512 milligrams per liter(ppm), which is <br /> very close to the reporting limit for this compound. Concentrations below 5 ppm are <br /> considered non-hazardous. <br /> We thank you for using Upgradient Environmental for this project, and would appr_-.-iate <br /> any opportunity to be of further service. Should you have any questions about our r:port, <br /> please do not hesitate to call me at 209-772-3620. <br /> Sirleerely, <br /> i -h <br /> r SgFgED Gfp, <br /> Victor B.Cherven, Ph. D. ���pRB• Cy 0 <br /> Principal Geologist <br /> Registered Geologist#3475 No.3475 <br /> i <br /> J5. <br /> 9�OF CALW)""S <br /> J <br /> • <br /> • <br />