Laserfiche WebLink
been reported to be non-detect since. Groundwater samples collected from MW-101 and MW- <br />105 reported minor concentrations of TPHg and BTEX compounds during the first few sampling <br />events but then remained non-detect below laboratory reporting limits. Ground Zero <br />recommends pressure grouting and over-drilling the upper three (3) of these wells. <br />MW-202 <br />MW-202 was constructed with a steel conductor casing to a depth of 50 feet bgs, Ground Zero <br />recommends pressure grouting and not over-drilling out the upper three (3) feet due to the steel <br />conductor casing <br />VEW-1 through VEW-6 <br />These wells are constructed to a total depth of 10 feet bgs and are limited to the vadose zone. <br />VEW-3 through VEW-6 are located within the Site building and cannot be destroyed using a drill <br />rig. Ground Zero recommends pressure grouting and over-drilling the upper three (3) feet of <br />VEW-1 and VEW-2. Ground Zero recommends pressure grouting and not over-drilling out the <br />upper three (3) feet of VEW-3 through VEW-6 due to access issues. <br />Waste Removal <br />Following SJCEHD approval of this well abandonment work plan, Ground Zero will remove all <br />equipment and waste associated with the UST clean up. Equipment associated with the soil vapor <br />extraction and air sparge systems will be removed. Granulated carbon will be removed from the <br />carbon tanks located on the Site and will be properly disposed of. Following the well destruction <br />process, all drummed soil and groundwater will be removed and properly disposed of. <br />Documentation of the waste disposal will be included in a site closure summary report. <br />Permitting <br />The permit applications, Master File Records and fees have been enclosed. <br />Schedule and Reporting <br />Following SJCEHD approval of the well destruction permits the work will be scheduled. A <br />summary of the well destruction and site closure activities will be presented in a report, including <br />a discussion of the well destruction efficiency (grout volume used versus grout volume <br />calculations). Copies of the report will be submitted to both the appropriate County and State <br />regulatory agencies. <br />If you have any questions or comments please contact Ground Zero at your convenience. <br />Respectfully, <br />Ground Zero Analysis, Inc. <br /> <br />Andrew Dorn, B.S. Geology <br />California Geologist-in-Training (Gil') #411 <br />Gregory P. Stahl, PG 5023 <br />CA Certified Hydrogeologist No. 264 <br />Page 3 of 4