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' Former Manna Pro Site Page 2 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 207 2 <br /> • February 6, 2004 <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 /> 1 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 Based on the <br /> results of the pilot testing, a feasibility study was also completed which <br />' suggested that a combined program of soil vapor extraction with air sparging <br /> was a feasible corrective method The resultant Corrective Action Plan (CAP) <br /> was implemented in 2001 with the construction of the limited, first-phase of <br />' the system The system entailed operation of one vapor extraction well and <br /> two air sparge wells for a period of 90 days The first phase of the CAP was <br /> completed in May of 2002 and documented in a subsequent report <br />' <br /> Beginning e <br /> gl g in September bei of 2003, a 19-well soil vapor extraction / air sparge <br />'• system commenced operations, and is continuing In the interests of clarity <br /> and minimization of clutter, the site maps attached to this report do not show <br /> the 19 service wells <br />' 1.2 Scope of Work <br />' The following work was completed during this round of groundwater <br /> monitoring <br /> i <br />' 1 The depth to groundwater was measured in 10 monitoring wells, and 5 <br /> observation wells located on, or near the site <br />' 2 Groundwater monitoring included sample collection and subsequent <br /> laboratory analysis from 6 monitoring wells <br />' 3 Collection of purge water from a prior monitoring event for recycling <br /> • <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> 1 <br />