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Firestone Store x/3573 400 North El Dorado Street, Stockton, California <br /> October 25, 1995 VES Quarterly Report and Request for Closure-4589 Page 4 of 14 <br /> Vacuum Levels <br /> Units: inches-of-water <br /> Date VE-1 MW-1 MW-2 MW-3 MW-4 MW-5 <br /> 11-4-94 14 22 044 06 1 3 08 <br /> 12-5-94 16 24 055 06 1 4 09 <br /> 12-19-94 16 2 1 045 055 1 2 075 <br /> 1-3-95 16 22 043 05 1 2 076 <br /> 1-18-95 16 22 041 05 1 2 074 <br /> 2-6-95 16 23 058 055 1 2 075 <br /> 2-20-95 18 2 5 068 062 1 3 094 <br /> 3-13-95 17 26 1 2 065 1 5 1 15 <br /> 4-24-95 18 275 080 070 1 55 10 <br /> The vacuum response at all monitoring paints verifies that the SVES zone of <br /> influence has generated vacuum coverage across the former UST area The <br /> consistency of vacuum levels throughout SVES operation suggests that the system <br /> had achieved a state of equilibrium and that the zone of vacuum influence was not <br /> increasing significantly with continuing system operation <br />' Based on the vacuum results, the horizontal radius of vacuum influence created by <br /> operation of SVES well VE-1 has been verified at greater than 20-feet, and is <br /> estimated to have exceeded 30-feet (Vacuum Influence Diagram - Appendix 7 5) <br /> The screened interval of vapor well VE-1 was installed from 18- to 28-feet BG, <br /> extending across the sand layer at 18- to 24-feet BG where the most concentrated <br /> petroleum impacts were observed In addition, at 28-feet BG, the screened interval <br /> extended below the deepest observed petroleum impacts at the site (field <br /> observations of slight odor at 27-feet BG) <br /> Based on previous contaminant delineation activity,the sphere of vacuum influence <br />' created by SVES operation is believed to have fully encompassed both the <br /> horizonal and vertical extent of soil containing gasoline impacts at the site. <br /> RYAN-MURPHY, INCORPORATED Denver <br /> Ewd"nmenW Coffin Management Los Angeles <br /> 1 <br />