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Mr. M. Scott Mansholt—CEMC <br /> Second Quarter 2007 Groundwater Monitoring and Sampling Report July 26, 2007 <br /> US Can-Welty Road Page 5 of 6 <br /> Based on the above conclusions, SAIC recommends the following: <br /> • Discontinue collecting groundwater samples from MW-5 since TPHd and PAHs have never been <br /> detected above ESLs or WQOs in this well. <br /> • Replace the oleophilic socks in wells MW-I and MW-2 on an annual basis (first quarter) rather <br /> than quarterly as these wells contain only a sheen of petroleum hydrocarbons that is not <br /> measurable with an oil/water interface probe and a total of only 0.34 gallon of SPO has been <br /> removed from these wells. <br /> • Discontinue collecting groundwater samples from WFSMW-1 as the fuel-fingerprint analyses <br /> from the samples collected during the first and second quarters of 2007 showed the petroleum <br /> hydrocarbons detected were in the gasoline range. <br /> SAIC is preparing a work plan to destroy wells MW-3 and MW-4 because the water volumes in these <br /> wells are consistently insufficient for adequate sample collection. In addition, SAIC proposes to advance <br /> soil borings at the site to collect soil and groundwater samples to further define the extent of petroleum <br /> hydrocarbons in the soil and groundwater. The work plan for additional site characterization and well <br /> destruction will be submitted during the third quarter of 2007. <br /> CLOSING <br /> If you have any questions regarding this report,please call Tom Burns at (916) 979-3748. <br /> Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> Thomas Hope 4Bums-, <br /> Project Scientist Senior Project Manager <br /> C)'�' <br /> Enclosures: <br /> Figure 1: Vicinity Map `x� 8�53 Q <br /> Figure 2: Site Map <br /> Figure 3: Potentiometric Surface Map—Second Quarter 2007 q F <br /> Figure 4: Petroleum Distribution in Groundwater— Second Quarter 2007 s1 TF 0 f C <br /> Table 1: Groundwater Elevation Data and SPO Thickness Measurements <br /> Table 2: Groundwater Chemical Analytical Results—TPHd, BTEX, and MTBE <br /> Table 3: Groundwater Chemical Analytical Results—PAHs <br /> Attachment A: Field Data Sheets <br /> Attachment B: Data Usability Summary, Laboratory Chemical Analytical Report, and Fuel-Fingerprint <br /> Report <br />