COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

L & M OPERABLE UNIT-THIRD QUARTER 2014 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Status of Remediation Activities October 31, 2014 3.1.2 Dual Phase Extraction System: Operational and Analytical Data -3Q14 During 3Q14 (June 30, 2014 to September 30, 2014) the DPE system was only operated for approximately 3.3 hours to process purge water generated during the 3Q14 monitoring and sampling event. During 3Q14 the DPE system recovered approximately 0.001 lbs. (0.0001 gallons) of TPHg, 0.005 lbs. (0.001 gallons) of TPHd, and 0.001 lbs. (0.0002 gallons) of TPHo. No appreciable amount of MTBE, TBA, or benzene was recovered by the DPE system during 3Q14. Historically the DPE system (GWE and SVE combined) has processed approximately 18,125 lbs. (2,971 gallons) of TPHg, 9,581 lbs. (1,334 gallons) of TPHd, 5,154 lbs. (676 gallons) of TPHo, 13.44 lbs. (1 .82 gallons) of benzene, 3.77 lbs. (0.61 gallons) of MTBE, and 0.58 lbs. (0.09 gallons) of TBA from water and soil vapor to date. Since system start-up groundwater extraction has treated approximately 7,302,465 gallons of water. Historical DPE system operations and analytical data are presented in Table 8 through Table 13. Chemical concentrations and mass removal graphs are presented on Figure 31 through Figure 34. Analytical lab reports and field data sheets for all O&M activities are presented in Appendix I. 3.2 L&M OU AND APARTMENT SOIL VAPOR EXTRACTION SYSTEMS 3.2.1 L&M OU and Apartment Soil Vapor Extraction Systems Summary The L&M OU SVE (SVE) and Apartment SVE (ASVE) systems had been operational since May 31, 2007. The SVE system is comprised of horizontal vapor wells: SVE-1 through SVE-1 1, a 100-gallon liquid/vapor separator, and a Solleco 500 cfm vapor extraction system with a Roots URAI 59 20-hp positive displacement blower. The ASVE system is comprised of horizontal wells (ASVE-1 through ASVE-6), a 100-gallon liquid/vapor separator, and a Solleco 250 cubic feet per minute (cfm) vapor extraction system with a Roots URAI 56 10-hp positive displacement blower. Vapor from both the SVE and the ASVE systems is abated with a 750 scfm thermal oxidizer. Since May 31, 2007 the 750 scfm SVE and ASVE vapor abatement system has been operated under SJVAPCD permit number N-4878-2-0. In a letter dated September 24, 2013 Stantec requested complete shutdown of the on- Site systems for rebound testing. On November 6, 2013 the RWQCB-CVR concurred with the rebound test but requested a vapor intrusion contingency plan be submitted should soil vapor monitoring results demonstrate hazardous vapor intrusion levels to Delta View Apartment residents during the period the systems are down. A contingency plan was submitted by Stantec dated January 17, 2014. In a letter dated April 7, 2014 the RWQCB-CVR requested submittal of a proposal to remove the existing SVE remedial 5ta ntec 3.2