SITE INFORMATION AND CORRESPONDENCE

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t Mr. Harlin Knoll Project No. 2007-065-01 May 19, 2000 Page 3 ionization detector (FID) were also forwarded to the laboratory for analysis. Soil samples were preserved for chemical analysis by sealing the tubes with Teflon tape and plastic caps, and stored in a cooler with ice. Sampling and analysis procedures are presented in Appendix D. Drill cuttings were stored on site in DOT 55-gallon drums. Monitoring Well Installation Two soil borings advanced to the west and southwest of the site, were converted to 2-inch diameter groundwater monitoring wells, MW-9, and MW-10 (see Figure 2). The monitoring wells were completed with 20 feet of 0.02-inch machine-slotted, schedule 40 PVC screen. Well screens were set with approximately 10 feet of screen above and 10 feet of screen below first-encountered groundwater. Well constructionn information is presented in the boring logs, included in Appendix C. Upon completing the installation of the filter pack, bentonite, and surface seal, a traffic-rated well box (vault) was installed flush with surrounding asphalt surface. A small batch of concrete was mixed and poured to cement the well vault in place. The newly installed groundwater monitoring wells will be surveyed and included in quarterly groundwater sampling and reporting. Air Sparge Well Installation The soil boring in the vicinity of pump islands, was converted to air sparge well AS-1. The air sparge well was completed with 2 feet of 0.02-inch machine-slotted, schedule 40 PVC screen. Well screen was set to approximately 10 feet below first-encountered groundwater (48 to 50 feet bgs). Well construction information is presented in the boring logs, included in Appendix C. Upon completing the installation of the filter pack, bentonite, and surface seal, a traffic-rated well box (vault) was installed flush with surrounding asphalt surface. A small batch of concrete was mixed and poured to cement the well vault in place. Destruction of Monitoring Well Monitoring well MW-5, located in the shoulder of the Lower Sacramento Road, was destroyed on May 5, 2000. Due to a proposed expansion of the Lower Sacramento Road, the City of Lodi requested the abandonment of well MW-5. After obtaining the City encroachment permit and SJCPHS well destruction permit the well was destroyed. The groundwater monitoring well was destroyed in place by pressure grouting with neat cement slurry. The grout was pumped through a trimie hose that was placed from the bottom of the well to approximately 5 feet bgs. The top 5-feet of the well was drilled out and the monitoring well box was removed. Soil was placed in the hole and compacted. The surface was finished to match the surrounding grade. CAMy Documents\USA165Veport.doc Stratus