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ECENED <br /> RDUNLAP,VAN VLECK & BROWN, LLC B �.4.bR <br /> GOVERNMENTAL RELATIONS 1. 3 ���� <br /> ' 925 "L"STREET,SUITE 850 PEP [CZ <br /> f- SA'C'RAMENTO,CALIFORNIA 95814 <br /> TELEPHONE(916)341-0808 <br /> FACSIMILE(916)341-0849 <br /> March'8, 2006 <br /> .y <br /> Margaret Lagorio, R.E.H.S. <br /> Environmental Health Department <br /> San Joaquin County <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202-2708 <br /> RE: 1140 W. Hammer Lane <br /> Stockton, California <br /> Dear Margaret: <br /> �•,! First, my apologies this workplan has taken a while to get into your hands. John Lane, <br /> Leslie Huffman and I have spent countless hours researching the best methods of <br /> remediation for the Knowles property site based on my client's needs and those of the <br /> regulators. As a result of our meeting December 21, 2005, 1 have outlined in this <br /> package the steps deemed necessary to clean-up the site at 1140 W. Hammer Lane, <br /> Stockton, California. <br /> f <br /> +- Due to the historically high contamination concentrations in Monitoring Well 5 (MW5) <br /> we have devised a plan for clean-up that we believe will accomplish the needs of <br /> regulators and Carl Knowles, Trustee of the Harold Knowles irrevocable trust. <br /> As it relates to MW5, in a January 25, 2005 letter to Mr. Carl Knowles from you, it was <br /> outlined that groundwater in sand at 95-98 feet below ground surface should be sampled <br /> and analyzed to demonstrate the vertical extent of impacted groundwater in the area of <br /> MW5. As a result of this recommendation, we have agreed to perform this and will use <br /> the information as a benchmark study for future remediation. <br /> If results from this sampling are what we anticipate then we will plan to move forward <br /> with a pilot project that is a more aggressive method than the traditional pump and treat <br /> remediation. In consultation with Ground Zero Analysis, Inc., we have determined that <br /> J we will use the in-situ oxidation as a method of remediation as it is more cost-effective <br /> c <br />