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i Ms Lon Duncan Page 2 I The depth to water in well MWl fell approximately 2 27 feet since last monitored on June 25, 2001 Groundwater elevations were calculated by subtracting the measured depth to groundwater in each well from the wellhead elevation Note that the depths to water in the Circle K wells were normalized to Ground Zero's water level probe calibration by subtracting 0 02 feet, as indicted by comparison of the two probe measurements in Circle K well MW3 Groundwater in the site vicinity flowed in northeasterly to easterly direction with a hydraulic gradient ranging from approximately 0 0 15-0 002 RIR A potentiometric surface map generated using the August 22, 2001 monitoring data is shown on Figure 2 Groundwater monitoring data for both sites are summarized in Table 1 Monitoring data sheets for 8709 N Davis Road are included in Attachment A On August 22, 2001, approximately 5 well casing volumes of groundwater was purged from well MW 1 During the purging process temperature, pH, and electrical conductivity parameters were monitored Purging continued until the physical parameters had stabilized Purge water was stored in a DOT approved drum and remains on site pending disposal Samples were collected subsequent to parameter stabilization and 100% groundwater level recharge The samples were placed in a chilled cooler and submitted to Argon Laboratories(ELAP 92359)under chain of custody protocol Analysis consisted of TPHg by EPA Method 8015 M and VOC's by EPA Method 8260 A purge log is included in Attachment A GROUNDWATER ANALYTICAL RESULTS TPHg and VOC's were not detected Analytical results are summarized in Table 2 Attachment B contains laboratory reports and chain of custody documentation SUMMARY • Groundwater levels have fallen since June 25, 2001 • All VOC's were at non-detectable concentrations No TPHg, BTEX or gasoline oxygenate additives were detected in the groundwater for the second consecutive sampling event CONCLUSIONS • First groundwater beneath the site does not appear to be significantly impacted by contaminants from the former UST at the site • A water sample from the domestic well immediately north of the site and generally downgradient of the UST release did not contain any detectable concentrations of VOCs or oxygenate additives Whatever minimal impact has occurred to the shallowest groundwater at the site has not affected deeper zones • All soil with detectable concentrations of contaminants was removed by excavation in November 2000 No potential threat to groundwater remains at the site Nsuuto\reportslconsamplerpt doc