WORK PLANS_FILE 2 - Laserfiche WebLink

Home Browse Search

Well Destruction Results Report W+ Moore Petroleum Bulk Plant,5491 `F'Street,Banta,California Page 4 September 26, 2003 —Apex submitted a workplan that recommended in-situ chemical oxidation by ozone sparging to remove the total petroleum hydrocarbons as diesel (TPHd) and total petroleum hydrocarbons as motor oil (TPHmo)mass from the soil and groundwater. November 10, 2003 —An addendum to the workplan was requested in a letter by the SJCEHD to increase the scope of work to further delineate the hydrocarbon plume by installing additional monitoring wells. Technical data on the ozone system and the spacing of the sparge points was also requested. On January 14, 2004, Apex submitted an Addendum to Workplan for Ozone Sparging. .r January 14, 2004—Apex submitted a Workplan for a Limited Subsurface Site Investigation, proposing the installation of five additional groundwater monitoring wells. May 12, 2004—The SJCEHD responded to the Addendum to Workplan for Ozone Sparging by approving the proposed ozone sparge wells and requesting an addendum to the workplan proposing an additional cone penetration testing(CPT)boring and relocation of the proposed groundwater monitoring well MW-17. August 16, 2004—In a letter, the SJCEHD directed an addendum be made to the Workplan for a Limited Subsurface Site Investigation (dated January 14, 2004) in order to define the vertical extent of contamination. Apex submitted a Workplan Addendum Letter for a Limited Subsurface Investigation, dated June 2, 2004. September 2004—Apex installed and tested an SVE system with activated carbon adsorption as the control device. In addition, Apex installed an ozone generator system for eventual ozone sparging. Results from the SVE system startup were reported to the District in the letter Source Test Report, dated November 11, 2005. December 6 and 8, 2004—Apex supervised the drilling of nine ozone sparge wells (OS-2 through OS-10). Results of the ozone well installations are reported in Apex's Interim Results Report for Ozone Sparge Wells, dated March 4, 2005. The ozone system began full-time operation on February 17, 2005. October 31, 2005 —Apex supervised the installation of four groundwater monitoring wells (MW-13, MW-14, MW-16, and MW-17). Drilling and installation of MW-15 was postponed until the receipt of Union Pacific Railroad's right-of-entry agreement. Results of the monitoring well installations are reported in Apex's Limited Subsurface Site Investigation Results Report, dated March 30, 2006. December 19, 2006—Apex installed and started operation of a new ozone sparging system (H2O Engineering). April 11, 2007—The SJCEHD issued a letter approving the reduction of groundwater sampling in wells MW-5 and MW-6 to an annual basis. The SJCEHD also requested that a site conceptual