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i 3 0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> Between December 17 2001 and March 19, 2002, theg roundwater surface rose an average of <br /> 2 74 feet, and the groundwater flow direction and gradient remained relatively constant Over the <br /> �r past seven quarters, the groundwater flow direction has shifted between northwest and northeast, <br /> over a range of approximately 45 degrees <br /> Consistent with previous results, concentrations of TPH-as-gasoline and BTEX compounds are <br /> restricted to MW-2 near the dispenser islands, and MTBE is concentrated in MW-2 and MW-4 <br /> downgradient of the USTs Over the past seven quarters, the concentrations of gasoline <br /> hydrocarbons in groundwater have generally declined, possibly due to previous source removal <br /> efforts The plume of MTBE in groundwater appears to extend to the north and east of the site <br /> toward domestic water wells located on Raylow Avenue The plume appears to be mostly <br /> delineated to the south (upgradient) by MW-1 and to the west (cross-gradient) by MW-3 The <br /> vertical extent of impacted groundwater is not defined <br /> L Based on these conclusions, Ramage Environmental published Work Plan, Additional Site <br /> Investigation, dated September 26, 2001, and a work plan addendum dated January 21, 2002 <br /> On January 30, 2002, PHSIEHD approved the modified scope of work On April 29, 2002, the <br /> cost to implement the approved work plan was pre-approved by the UST Cleanup Fund <br /> On May 9, 2002, Ramage Environmental submitted an encroachment permit application to the city <br /> of Manteca, to drill a cone penetration test (CPT) boring in the Raylow Avenue right-of-way east of <br /> the site Currently, the permit application is pending approval The CPT drilling is scheduled for <br /> June 26-28, 2002 <br /> i <br /> 7 <br />