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I � <br /> Former Manna Pro Site Page 2 <br />' Quarterly Groundwater Monitoring Report <br />' Project No. 207.2 <br /> April 23, 2002 <br /> fl <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 /> f 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 /> k L documented in the July 31, 2000 report entitled Report, Remedial Action Pilot <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 /> k <br /> The San Joaquin County PHS-EHD has concluded that the release at this site <br /> has been adequately characterized and directed that a Corrective Action Plan <br /> .� q Y <br /> be prepared and implemented. The first phase of an air sparge / vapor <br /> extraction system was constructed and has been operating since February 14, <br /> 2002. <br /> 1.2 Scope of Work <br /> r 3 The following work was completed during this round of groundwater <br /> monitoring: <br /> 1. The depth to groundwater was measured in'10 monitoring wells, 1, service <br /> well, and 2 observation wells located on, or near the site. <br /> . 1 <br /> 2. Groundwater monitoring included sample collection and subsequent <br /> laboratory analysis from 7 monitoring wells.: <br /> I <br /> ' 1 <br /> 2937 Venernan Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209)569-0293 <br />