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Lo %00 monitoring Well Installation Work Plan Raymond.Investment Corporation August 11,2004 Page 2 R. removal activities and the results of the laboratory analyses were described by Condor in the Underground Storage Tank Removal Report dated May 14, 2003. ` In a letter dated November 4, 2003, to Ms. Garcia, Vicki 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 La 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 S 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 are impacted by TPH-G and TEPH-D. No petroleum hydrocarbons were detected at or above the laboratory reported detection limits in the three soil samples 06w and the groundwater sample collected from boring SB-S, which was advanced adjacent to the former UST excavation. This suggested that there has been minimal impact to soil and groundwater in the vicinity of the former UST location. The greatest impact to soil and groundwater is in the vicinity of the L. former piping and dispenser. The soil under the building in the vicinity of the former dispenser location is probably impacted by petroleum hydrocarbons, and the groundwater contaminant plume probably extends under the building. 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. +v 3.0 MONITORING WELL INSTALLATION FIELD PROCEDURES This section includes a description of the site preparation and monitoring well installation, development, ry surveying, and sampling procedures. ' 3.1 SITE PREPARATION Lo Condor will prepare monitoring well installation permit applications for submittal to the SJCEHD. Condor will receive the well installation permits prior to initiating any fieldwork. The proposed monitoring well locations will be marked with white paint and Underground Service Alert (USA) will be notified at aV least 48 hours in advance of the fieldwork to locate and identify underground utilities in and near the r work area. Because companies contacted by USA may not identify utilities past private property lines,? and into the site, however, it is the responsibility of the property owner to identify any site utilities. La 3.2 MONITORING WELL INSTALLATION PROCEDURES Three shallow monitoring wells will be installed. The monitoring well borings will be drilled using an eight-inch outside diameter, continuous-flight hollow-stem auger. Drilling activities will be performed under the supervision of a Condor geologist in accordance with the provisions of the SJCEHD permits. Drill cuttings from the monitoring well borings will be logged in accordance with the Unified Soil Classification System (USCS). Descriptions of soil types encountered will be recorded on geologic logs. �r 4M to CONDOR r..