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' Former Manna Pro Site Page 2 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 207 2 <br /> November 4, 2002 <br /> • <br />' Later, Groundwater Technology Inc (GTI) installed four additional monitoring <br /> wells, a combination groundwater/vapor extraction well and three observation <br /> wells These wells were used for the completion of groundwater pumping and <br />' vapor extraction pilot tests <br /> Between 1996 and April of 2000, the principal remedial activity consisted of <br />' groundwater monitoring In April of 2000, a deep monitoring well (MW-11) <br /> was constructed to characterize the vertical distribution of hydrocarbons in the <br /> subsurface At the same time, a new vapor extraction well and an air sparge <br />' well were constructed as part of a pilot remedial test program The <br /> construction of MWD-11 was documented in the quarterly monitoring report <br /> for the spring 2000 monitoring event The results of the pilot test were <br />' documented in the July 31, 2000 report entitled Deport Remedial Action P11ot <br /> Study Former Manna Pro Site To date, a total of 11 groundwater monitoring <br />' wells, 5 observation wells, and three test wells have been constructed on or <br /> near the Manna Pro site <br />' The San Joaquin County EHD has concluded that the release at this site has <br /> been adequately characterized and directed that a Corrective Action Plan be <br /> prepared and implemented The first phase of an air sparge / vapor extraction <br />� . system was constructed and operated for 90 days beginning on February 14, <br /> 2002 Based on the results of this work, a addendum to the Corrective Action <br /> Plan was prepared, and the addendum was recently approved <br /> 1.2 Scope of Work <br /> tThe following work was completed during this round of groundwater <br /> monitoring <br /> 1 The depth to groundwater was measured in 10 monitoring wells, and 3 <br /> observation wells located on, or near the site <br />' 2 Groundwater monitoring included sample collection and subsequent <br /> laboratory analysis from 5 monitoring wells <br /> 3 Waste purge water from prior groundwater monitoring was disposed of <br /> 1 2937 veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />