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Ms. Connie Davis/Aggregate Industries - F Slreet October 2001 QMR Project Number 10010[8 PnRncoN November 16, 2001 Page 4 temperature, electrical conductance and pH measurements; dissolved oxygen (DO) measurements; and laboratory results. 4.1 Quarterly Monitoring Field Data Groundwater temperature, electrical conductance and pH measurements were performed on October l8, 2001 during purging of the wells prior to collecting groundwater samples for laboratory analysis. Measurements were recorded during the removal of water from the wells. The wells were considered purged when temperature, electrical conductance and pH measurements stabilized to within ten (10) percent for three (3) consecutive measurements and a minimum of three (3) well volumes were removed from the well. Purge water was discharged on site. DO measurements were also performed on October 18, 2001. DO monitoring results are summarized in Table 2 and on Figure 4 which are attached to this report. As seen from Table 2 and Figure 4, DO concentrations ranging from approximately 0.7 to 4.8 milligrams pe.r liter (mg/L) were observed at the site during the October 2001 sampling event. 4.2 Quarterly Monitoring Laboratory Data Groundwater samples were collected on October 18, 2001 by Paragon from wells MW-1 through MW-5 and EW-1. The samples were placed in glass vials with Teflon septa and transported under standard Paragon chain-of-custody procedures to Technology Laboratory, Inc. (TLI) for BTEX and TEPH analyses. Laboratory results for groundwater samples collected from the site in July and October 2001 are summarized in Table 2. The laboratory results for the groundwater samples collected from wells MW-1 through MW-5 and EW-1 on October 18, 2001 are also summarized o^ Figure 4. Copies of the October 2001 TLI laboratory reports are also attached to this report. As seen from Table 2 and Figure 4, BTEX and TEPH concentrations were not observed above the laboratory detection limits of 0.5 micrograms per liter (µg/L) and 0.5 mg(L, respectively, in the groundwater samples collected from wells MW-l through MW-5 and EW-1 on October l8, 2001. Concentrations of BTEX and TEPH observed in the groundwater samples collected from wells MW-1 through MW-4 and EW-1 during October 20(Il remained generally consistent with results from July 2001. The Maximum Contaminant Levels (MCLs) for BTEX are also summarized in Table 2. As seen from Table 2, the MCLs for BTEX are 5.0; 1,000; 680 and L0,000 µg/L, respectively. Those standards are the statewide interim organic pollutant standards published in "The