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CONDOR EARTH TECHNOLOGIES INC <br /> � 188 Frank West Circle Suite I <br /> Stockton CA 95206 <br /> Phone 209.234.0518 <br /> FAX 209.234.0538 <br /> CONDOR www.condorearth.com <br /> March 7, 2003 __ '_�10 U S D <br /> Harlin Knoll <br /> MAR 1 1 2003 <br /> San Joaquin County Environmental Health Department ENVIRONMENT HEALTH <br /> 304 E. Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> RE: Groundwater Monitoring Program Reductions/Modifications and Deep Monitor Well <br /> Liistallaiion fOr the Eckert C oid Storage Co., 757 1VIO Ui nivu., NIAALit;Ca, CA, Cuncior Frojeci iNU. <br /> 3471 <br /> Dear Mr.Knoll: <br /> Condor Earth Technologies, Inc. (Condor) herein proposes reductions to the quarterly groundwater <br /> monitoring program at the above referenced site. This measure was discussed during the meeting on <br /> January 28, 2003, attended by you and Mr. Nuel Henderson(SJCEHD),Mr. Pete Thompson(President of <br /> Eckert Cold Storage Co.), and Condor. During the meeting, you and Mr. Henderson indicated that the <br /> SJCEHD would consider a proposal for monitoring reductions at the site. You also indicated that the <br /> installation and monitoring of an additional monitor well located down-gradient of the source area and <br /> screened in a horizon deeper than the existing site monitor wells would complete the investigation of the <br /> extent of the contaminant plume. <br /> A proposal for the installation of the above described additional monitor well is not included in this letter <br /> because Condor is currently evaluating soil over-excavation as a remedial alternative for the site. <br /> Preliminary evaluation by Condor suggests that proper destruction of site monitor wells MW-1, MW-2, <br /> and MW-8 would be required to conduct a soil over-excavation that removed most of the vadose zone <br /> contamination at the site. Locating the deep monitor well is problematic at this time because of the <br /> potential soil over-excavation. Condor anticipates that the SJCEHD will require the replacement of down- <br /> gradient monitor well MW-8 after the soil over-excavation. Therefore, Condor proposes that further <br /> consideration of the installation of a deeper screened monitor well be delayed until the disposition of the <br /> site relative to remediation is determined and it is possible to install the new well at the same time that <br /> MW-8 is replaced. <br /> Groundwater Monitoring Reductions <br /> Condor proposes no further sampling of MWA, MW-3 and MW-6, annual sampling of MW-5 and MW- <br /> 7, and continued quarterly sampling of MW4 and MW-8. As described above, if MW-8 is properly <br /> destroyed as part of a soil over-excavation, Condor anticipates that the SJCEHD would require <br /> replacement of the well with another shallow monitor well that would be sampled quarterly. <br /> Discontinuing sampling of MW-1 and MW-3 is proposed because groundwater conditions are extremely <br /> well established in those locations and not likely to change until remediation is conducted. Groundwater <br /> conditions at MW-6 are also well established and the well is located up and side-gradient. Annual <br /> monitoring of MW-7 will provide enough data to evaluate potential migration of contamination into the <br /> site from up-gradient sources. MW-6 is redundant in that regard. Annual sampling of MW-5 will provide <br /> enough information to adequately monitor the northeast edge of the plume. Quarterly monitoring at MW- <br /> I <br />