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Monitoring Weli Installation Report 730 B Channel Street,Stockton,CA December 15,2004 s Page 2 r • In a letter dated November 4, 2003, to Ms Garcia, Victoria McCartney of the SJCEHD directed Raymond , Investment Corporation to submit a work plan to investigate the lateral and vertical extent of contamination at the Site Condor prepared the Soil and Groundwater Investigation Work Plan, dated ' February 19, 2004, at the request of Ms Garcia in response to that letter Ms McCartney approved the work plan, with modifications, in a letter dated March 17, 2004 The modifications included the elimination of three proposed borings in the vicinity of the former UST location and the elimination of ' - one proposed boring in the vicinity of the former location of the diesel filter and piping Ms McCartney also directed the soil and groundwater samples to be analyzed for 1,2-dibromoethane (EDB), methanol, and ethanol ' Condor conducted soil and groundwater investigation activities at the Site on May 5 and 6, 2004 The investigation included the installation of six direct push borings to collect soil and groundwater samples Laboratory analytical results of the soil and groundwater samples collected during the investigation indicated that the soil and groundwater at the Site were impacted by TPH-G and TEPH-D at those locations No petroleum hydrocarbons were detected at or above the laboratory reported detection limits in the three soil samples and the groundwater sample collected from boring S13-5, which was advanced adjacent to the former UST excavation This suggested that there was minimal impact to soil and groundwater in the vicinity of the former UST location Condor described the results of the investigation in the Soil and Groundwater Investigation Report, dated June 1, 2004 In the report, Condor ' recommended preparing a work plan for the installation of three groundwater monitoring wells and initiating quarterly groundwater monitoring at the Site In a letter dated July 7, 2004, Victoria McCartney of the SJCEHD directed the preparation and submittal of a work plan for the installation of three • groundwater monitoring wells at the Site Condor prepared the Monitoring Well Installation Work Plan, dated August 11, 2004, at the request of Beverly Garcia in response to that directive In a letter dated August 25, 2004, Victoria McCartney approved the work plan 3.0 MONITORJING WELL INSTALLATION AND DESTRUCTION PROCEDURES This section includes a description of the Site preparation, drilling procedures, monitoring well installation, monitoring well destruction, surveying, development, and sampling procedures, and the T laboratory analytical methodology 3.1 SITE PREPARATION Condor prepared a monitoring well installation permit application for submittal to the SJCEHD and received the approved permit prior to initiating any fieldwork The proposed monitoring well locations I were marked with white paint and Underground Service Alert (USA) was notified 48 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area 32 DRILLING PROCEDURES A Condor geologist was on Site to supervise the work Prior to commencement of fieldwork, a tailgate safety meeting was held and a Site-specific Health and Safety Plan was discussed with, and presented to, all field personnel for their signatures Three groundwater monitoring wells (MW-1, MW-2, and MW-3) were installed on September 23 and 24, 2004 Monitoring well MW-3R was installed on October 26, 2004, to replace monitoring well MW-3, which was properly destroyed on October 26, 2004 The locations of the monitoring wells are shown on • Figure 2 in Appendix A The drilling services were provided by V & W Drilling Inc of Isleton, I va �t� CONDOR