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Valley Water Treatment Page 4 <br /> Corrective Action Plan <br /> ' GPE Project No.480.3 <br /> December 12,2006 <br /> ' . Excavate and remove a maximum of 50 cubic yards of gasoline- <br /> impacted soil. <br /> ! • To complete the excavation, it will be necessary to destroy, and later <br /> replace MW-1, which is located through the site of the tank pit. <br /> ' . Complete a detailed report documenting the fieldwork and <br /> summarizing the laboratory analytical work. The report will discuss <br /> ' the results and implications of the data and will make <br /> recommendations regarding the future course of action. <br /> 1 e We propose to dispense with the quarterly monitoring for this current <br /> quarter, and wait until after completion of the excavation and <br /> replacement of MW-1 to conduct the next quarterly monitoring event. <br /> 1 <br /> 5.0 PROPOSED EXCAVATION <br /> The attached site map shows the subject Property and its improvements and <br /> the locations of the four existing monitoring wells. It also shows the rough <br /> ' outlines of the proposed excavation. The excavation is expected to cover an <br /> area of about 8 by 10 feet and reach a depth of about 13 feet. This suggests a <br /> total excavation volume of about 38 cubic yards. The groundwater surface at <br /> this site occurs about 7 to 9 feet below grade. <br /> ' 5.1 Preliminary Site Work <br /> Preliminary work will consist of obtaining a permit to install the replacement <br /> monitoring well from the San Joaquin County EHD. Prior to commencing <br /> iwork, the area will be marked for Underground Service Alert (USA) to verify <br /> no buried utilities will be disturbed. The existing monitoring well, MW-1 will <br /> be destroyed by filling it with bentonite clay. Most of the well will ultimately <br /> be removed during the course of the excavation. The lowest, approximately 7 <br /> feet of the well will remain in place. <br /> 5.2 UST Pit Excavation <br /> A backhoe owned and operated by Del-Tech Geotechnical Services will be use <br /> rto excavate the original UST pit. The expected surface of the pit will be <br /> about 8 by 10 feet, and about 12 to 13 feet deep. Soil excavated from the pit <br /> will be stockpiled on the site on Visqueen sheeting. The dimensions of the pit <br /> will be guided by use of a PID organic vapor meter, to help determine the <br /> extent of contaminated soil. <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />