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t r) Mr Harlin Knoll Page 3 of 4 newly installed well was developed by surging and bailing until turbidity was minimized Physical parameters (temperature, pH, electrical conductivity, and turbidity) were measured during well development Groundwater samples were collected after the physical parameters stabilized, and the water level in the well recovered to at least 80% of the pre-purged level The samples were submitted to Argon under chain of custody protocol for the analysis of BTEX and MTBE by EPA method 8021B and TPHg by EPA method 8015B Well development logs are included in Attachment B Groundwater monitoring data are summarized in Table 2 Purged groundwater was placed into DOT certified 55-gallon drums The drums are currently stored on site pending disposal options Wellhead Survey The newly installed monitoring well was surveyed by Morrow Surveying(a State-licensed land surveyor) pursuant to AB2886 on December 4, 2003 Morrow Surveying recorded the latitude and longitude of the site wells relative to the North American Datum (NAD83) and the well casing elevation relative to City of Stockton benchmark 2N-2 A site map showing all monitoring well locations, latitude and longitude coordinates and wellhead elevations is included in Attachment B ANALYTICAL RESULTS Groundwater Analytical Results,Wells MW1,MW4,MW5 Well MW5 contained TPHg at a concentration of 48,000 parts per billion (ppb), benzene at 5,200 ppb, toluene at 1,600 ppb, ethylbenzene at 790 ppb, and xylenes at 4,700 ppb Well MW1 contained TPHg at a concentration of 310 ppb, ethylbenzene at 8 2 ppb, and xylenes at 4 4 ppb No benzene or toluene were detected in well MW 1 No gasoline constituents were detected in well MW4 Analytical results are summarized in Table 3 Laboratory data sheets and chain of custody documentation are included in Attachment C Figure 3 presents a benzene isoconcentration map utilizing the most recent analytical results Attachment D contains graphical representations of TPHg and benzene concentrations over time in site wells Soil Analytical Results,Well MW9 No constituents of concern were detected above laboratory method detection limits (MDLs) in the two soil samples analyzed from boring MW9 Soil analytical results are summarized in Table 4 Laboratory reports and chain of custody documentation are included to Attachment C Groundwater Analytical Results,Well MW9 No constituents of concern were detected above MDLs in the groundwater sample collected from well MW9 Groundwater analytical results are summarized in Table 3 Laboratory reports and chain of custody documentation are included in Attachment C GIGROUNDZOKNOWLES HAMIREPORTSIQMR1200314QM2003 doc