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Chevron Products Company <br />Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lo3u <br />di, California Page b <br />ly 15, 2402 <br />• GWE and SVE operational data indicate a decline in hydrocarbon mass removal <br />from the subsurface. <br />5.0 RECOMMENDATIONS <br />Based on the data presented above and as requested by the Regional Water Quality Control <br />Board, Central Valley Region (RWQCB-CVR), in their letter dated, March 13, 2002 <br />(Attachment G), SECOR recommends the following: <br />• No additional assessment activities; <br />• To optimize the effectiveness of the SVE system it is recommended that SVE be <br />discontinued during the fourth quarter 2002 (4Q02) to allow the subsurface to <br />return to a static state which may allow for preferential flow paths to collapse. <br />Following the 4Q02 SVE will be reinitiated and re-evaluated on a quarterly basis; <br />• The continued operation of the GWE system; and, <br />• The continuation of quarterly groundwater monitoring and sampling, <br />IAChevron1957751Periodic MonitoringlQuarterly Progress Reports1200212nd Quarter -2002 Progress Report.doc <br />