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k■ K L E I N F E L D E R It should be noted that it appears that many of the extraction wells including EWA6 and EWA8 were not operating during this period of data collection. Additionally, two smaller capture zones are noted at locations EWA6 and EWA7 with flows to the north/northwest. On the southeastern portion of the Sharpe Army Depot (furthest away from the CNP site) there appears to be two distinct capture zones with EWA9 and EWAIO. Circular depressions are created by the extraction wells and the general flow direction is disrupted showing flow in the area as being from the south, east, and west towards the center. The groundwater elevations noted in the Sharpe Army Depot monitoring well MW440A (located on the Sharpe sites southwest corner and closest to the CNP piezometers) shows approximate correlation to the plant wells groundwater elevations from quarter to quarter over the past four quarters as shown on Kleinfelder's last groundwater monitoring report submitted for March 2002 Table 2, Groundwater Elevation and Flow Data. The elevation benchmark survey data for the Sharpe Army Depot wells is not known at this time for exact correlation. Please refer to the attached groundwater contour maps for the last four quarters of data collection at the CNP site. Groundwater flow in the McKinley Avenue recharge area has been predominantly to the northeast and southeast with a groundwater mound extending east -west between MW-1 and MW-4. The cause of the mound is unknown at this time considering the main application areas are to the north and south of the mounded area. The groundwater contours support Kleinfelder's initial and continued evaluation of the area. Flow in the Louise Avenue proposed application area the groundwater flow direction has been recorded consistently to the west. The Louise Avenue area is located the furthest from the Sharpe Army Depot, approximately 1 mile away to the south and does not have process water applied to the area yet.. It does not appear that the Louise Avenue area is affected by the groundwater extraction activities at the Sharpe Army Depot. As "seen in the second paragraph above, Kleinfelder did employ the groundwater data supplied by the RWQCB. Groundwater contours were made on the addendum letters plates when applicable. If the groundwater elevations in the three piezometers of CNP and the Sharpe well MW 440A were similar, then drawing whole numbered contours was not practical, and therefore not done. That was the case in two of the four quarters of data contoured. Additionally, as noted in Kleinfelder's initial addendum letter paragraph 2, the benchmark for the Sharpe wells was not made available by the RWQCB even though they expected a hydrogeologic assessment in the vicinity of the site with the limited data provided. No where in the RWQCB Request for Addendum dated August 21, 2002, did the RWQCB request a hydrogeologic assessment of the site vicinity. Such an assessment would be time consuming and costly to CNP. The following items are in response to the bulleted items the RWQCB requested be addressed. The italicized comments made by the RWQCB are re-stated below followed by a response. Kleinfelder's addendum proposes that an upgradient well be installed in one of two well locations for the 17.6-acre land application area. However, the addendum does not specify which location will be chosen. By October 11, 2002, submit a revised Plate S with a specific groundwater monitoring well location or add a sufficient number of wells to allow evaluation of groundwater conditions upkradient and downgradient of the land application areas. Kleinfelder recommends that one additional monitoring well be installed near the southeast portion of the 17.6-acre rapid infiltration area. The well will be installed near the southeast C20-4587-OI.MNI /ST02L262 Page 2 of 4 Copyright 2002,Kleinfelder,Inc. October 11,2002