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The initial quarterly monitoring event can be conducted approximately three months following <br /> the initial monitor well sampling event(conducted after the well installation)and will be <br /> continued on a quarterly basis thereafter. Quarterly monitoring reports can be submitted within <br /> 30 days of the quarterly monitoring event. <br /> An annual groundwater monitoring report will be submitted within 45 days of the fourth <br /> consecutive monitoring event. The annual report will be submitted in place of a quarterly <br /> groundwater monitoring report. The annual groundwater monitoring report will summarize the <br /> results of the previous quarterly monitoring events. These results will include the intrinsic <br /> bioremediation parameter measurements collected during the initial monitor well installation <br /> sampling event and the fourth quarterly monitoring event. The annual monitoring report will <br /> include an evaluation of the lateral extent of the dissolved diesel plume,the thickness of the free- <br /> phase diesel (if present)at the location of MW-4,hydrogeologic conditions(including gradient <br /> and water table fluctuations), and any natural attenuation of the contamination due to intrinsic <br /> bioremediation or other mechanisms. The annual monitoring report will also include <br /> recommendations for site disposition including monitoring reductions or additional work, if <br /> necessary. <br /> Request for Approval to Proceed <br /> LOF respectfully requests your approval to proceed with the scope of work as described in the <br /> previously approved Work Plan,Addendum to Work Plan,and proposed modifications described <br /> in this letter. As described in the Project Schedule portion of this letter,the monitor well <br /> installation can proceed within 30 days of your approval. If there are any questions, please call <br /> Jon Weiss,LOF Environmental Coordinator, at(209) 858-6202. <br /> Respectively Submitted, <br /> CONDOR EARTH TECHNOLOGIES,INC. <br /> ED G <br /> Donald F. Kresse ppNp�p F.IQiESSE Robert J.Job,P.E. <br /> California Registered California Registered <br /> Geologist 46430 N0.6430 * Professional Engineer, Civil <br /> J'J Q �' #51592 <br /> OF CN1 kF <br /> 13 <br /> cc: Mr. Ronald Rowe, San Jo any Public Health Services,Environmental Health <br /> Department <br /> P:\I838 LOF Diesel Line\WORK PLAN ADDENDUM 2-99.doe <br /> V <br /> t, CONDOR <br />