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KLEINFELDER <br /> EXPECT MORE <br /> The most recently drafted third quarter 2006 quarterly report for the subject site <br /> indicates an approximate depth to groundwater of 8 to 9 feet bgs. The groundwater <br /> flow direction in the northeastern portion of the site was southwest at 0.0009 ft./ft. and <br /> in the southwestern portion of the site is northeast at 0.0054 ft./ft. The discrepancy <br /> between the SJCFCD and onsite findings is likely due to equilibrating groundwater <br /> conditions since pumping of Oakwood Lake has stopped. For these reasons <br /> fluctuations in groundwater flow directions and gradients should be expected to occur <br /> and additional monitoring wells may need to be installed in the future. <br /> 1.3 PROPOSED MONITORING WELL LOCATIONS AND RATIONALE <br /> To better understand the rationale for the proposed monitoring well locations the <br /> following is a brief overview of the existing monitoring well network including wells MW- <br /> 1 through MW-7. The current monitoring well network is composed of seven wells. <br /> Monitoring wells MW-1 through MW-4 are located near the existing WWTP (southwest <br /> portion of the site) and monitoring wells MW-5 through MW-7 are located around <br /> proposed holding Pond No. 1 (northeast portion of the site). <br /> MW-1 is located downgradient and northeast of the Sequencing Batch Reactor (SBR) <br /> and Sludge Ponds. MW-2 and MW-3 are located downgradient of the Equalization and <br /> Emergency Storage Ponds. MW-2 is also downgradient of proposed holding Pond No. 3. <br /> Monitoring well MW-4, based on recent groundwater soundings (Third quarter of 2006) is <br /> located north and downgradient of the Emergency Storage Pond. <br /> MW-5 is located upgradient and northeast of proposed holding Pond No. 1. MW-6 and <br /> MW-7 are located south and west, respectively of Pond No. 1. MW-7 is located <br /> downgradient of Pond No. 1 and MW-6 is located cross to downgradient of Pond No. 1. <br /> Nine new groundwater monitoring wells will be installed at the proposed locations shown <br /> on Plate 1. The wells will be installed to assess groundwater quality, groundwater flow <br /> direction and gradient during the time of sampling. The proposed locations are based on <br /> existing and future estimated groundwater flow (after equilibration of groundwater) <br /> towards the west/northwest and the current proposed locations of holding ponds and <br /> larger application areas. <br /> The rationale of the proposed well locations is to supplement the existing monitoring well <br /> network such that the proposed wells will effectively monitor up and downgradient areas <br /> of the proposed holding ponds and larger application areas. The application areas have <br /> been designated Areas A through F (See Plate 1). Kleinfelder considers the larger <br /> application areas as A, B and C and smaller application areas D through F. Application <br /> Area A extends along the northern border of the site between proposed holding Pond No. <br /> 1 (northeast portion of site) and proposed holding Ponds 2 and 4 (northwest corner of the <br /> site). Large application Areas C and D are located in the southeast portion of the site. <br /> Smaller application Areas D and E are located in the southwest portion of the site and <br /> application Area F is a small strip area along the eastern border of the site. <br /> 48093.E01/ST07R052/CJC/Iv Page 3 of 15 <br /> ©2007 Kleinfelder, Inc January 26, 2007 <br />