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7 <br />S E C 0 R <br />First Quarter 2003, Quarterly Progress Report <br />April 15, 2003 <br />Page 5 <br />monitoring and sampling program Monitoring well MW -5A is potentially screened across A and B -Zone <br />quarters and is used for contouring purposes MW -5A is located In proximity to A -Zone well MW -6 and 13 - <br />Zone well MW -513 <br />5.2 Groundwater Extraction <br />SECOR recommends the continued operation of the GWE system to maintain hydraulic control of <br />petroleum hydrocarbons remaining onsite <br />5.3 Soil Vapor Extraction <br />Concentrations of petroleum hydrocarbon in the vapor stream are non -detect and mass removal has <br />reached asymptotic levels Therefore SECOR recommends the discontinuation of SVE <br />5.4 Assessment Activities <br />SECOR recommends no additional assessment activities <br />11Chevron1957751Penodic Monitoring\Quarterly Progress Reports1200311 st Quarter -2003 QPRi REV C doc <br />