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Page 2 of 2 <br /> t � <br /> V -----Original Message----- <br /> From: Murphy, Mike [mailto:mmurphy@cambria-env.com] <br /> Sent: Thursday, December 21, 2006 3:13 PM <br /> To: Lori Duncan [EH] <br /> Subject: 2375 W. Grantline Road,Tracy VACOPS <br /> Importance., High <br /> Lori, <br /> Please see attached graphs. It looks like vacops has done a good job in reducing MTBE, but it also looks <br /> like it has reached its effective limit. Concentrations look to be hovering around 300 to 500 ppb in both <br /> wells MW-1 and MW-6 for the past few months. I think we should stop vacops and monitor post <br /> remediation groundwater concentration trends. At current MTBE levels,'vacops/groundwater extraction is <br /> I not warranted or cost effective. I would like to.stop vacops at the end of December. If concentrations rise <br /> down the road, we can re-evaluate. Let me know your thoughts ASAP please. <br /> FYI —the 4th quarter report will be issued next week. <br /> Thanks, <br /> Mike <br /> Mike Murphy <br /> Senior Project Scientist <br /> Cambria Environmental Technology,Inc. <br /> 19449 Riverside Drive, Suite 230 C--------- NEW ADDRESS!! <br /> Sonoma, CA 95476 <br /> Phone: 707.933.2367 <br /> FAX: 707.935.6649 <br /> Cell: 510.385.3116 <br /> J <br /> A Woman-Owned Business <br /> This e-mail may contain confidential and privileged material for hhe sole use of ttie intended recipient Any review or <br /> f distribution by others is strictly prohibited.If you are not the intended recipient please contact the sender and delete all <br /> copies. <br /> l <br /> I <br /> 4/20/2007 <br />