Laserfiche WebLink
Cleologfcal TechAia Inc. Page 8 <br /> Groundwater Monitoring Report <br /> Project No.750.2 <br /> April 1,2005 <br /> 3.3 Groundwater Analytical Results <br /> Groundwater Monitoring Wells <br /> • All groundwater-monitoring wells were non-detect above laboratory reporting limits for <br /> all analyzed constituents. <br /> • Groundwater analytical data are summarized in Table 3 of Appendix A. <br /> Groundwater Parameters <br /> • pH measurements collected from the water table wells range between 6.90 and 7.14 and <br /> are conducive to biodegradation activity. <br /> • EC measurements in the water table wells range from 649 (Dmhos/cm to 834(Dmhos/cm. <br /> • Oxidation-reduction potential (ORP) measurements were positive in all water table <br /> ,r monitoring wells and ranged between 219 mV and 247 mV. <br /> • All water table and deep monitoring wells at the site has Dissolved Oxygen (DO) levels <br /> greater than 3.50 ppm. DO measurements above 2.0 ppm indicate conditions are <br /> conducive to aerobic biodegradation. <br /> • Field parameters recorded in the deep well MW-101 are consistent with data from the <br /> water table wells. <br /> Table 4 summarizes the groundwater parameters measured at the site. <br /> 4.0 VAPOR EXTRACTION SYSTEM <br /> Internal Combustion Engine—February 2002 to January 2003 <br /> The internal combustion engine (IC) was set in operation on February 5, 2002. The IC ran <br /> until February 27, 2002 when it was shutdown and removed from the site because it was not <br /> r <br /> properly controlling emissions. The IC was completely rebuilt and returned to the site on <br /> April 22, 2002 and restarted. The IC operated until late May when it was again removed <br /> from the site due to mechanical failure. <br /> The IC was rebuilt again and returned to the site on June 14. The IC ran continuously from <br /> June 14 to December 10, 2002, when it was shutdown for a spike test. The IC operated <br /> between January 1, 2003 and January 31, 2003. The IC was shutdown due to the end of <br /> operation for both the air permit and cost pre-approval. The IC removed approximately 700 <br /> gallons of gasoline from the subsurface during 256 days of operation. <br /> Soil Vapor Extraction System—Current Remediation S sy tem <br /> The Soil Vapor Extraction—Granulated Activated Carbon System (SVE) was installed at the <br /> site during September 2004. The SVE was started and air samples collected in the presence <br /> of Lori Duncan, San Joaquin County Environmental Health Department (SJCEHD) and Lisa <br />