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Kennedy/Jenks Consultants Mr. Timothy O'Brien California Regional Water Quality Control Board 10 March 2005 Page 3 the conceptual hydraulic modeling of the river and groundwater system (Darcy flux model)will be included in the Groundwater Characterization Report. Item 2 — Pond Level Gauge Pond level gauges were installed in all four process water ponds several years ago. The water level readings are reported monthly to the CRWQCB. These level readings will be used for the Groundwater Characterization Work Plan. Item 3 — Production Wells It is important to collect as much readily available data as possible, which is why the production wells were included. Data from these wells can be used to generate an overall picture of the groundwater status in the area. Also, some of the production wells may draw from aquifers of concern. If the data from the production wells does not correlate well with the data from the monitoring wells, then we will not use the data from the production wells in our analysis of groundwater monitoring well data. Item 4 — CPT/HydropunchTM Study The proposed location of Cone Penetrometer Test 01 (CPT-01) has been moved westward, so that it is not directly downgradient of the ponds (See Revised Figure 2). The proposed location of CPT-03 has been moved farther north to move it farther from the ponds. The location of the ponds and nearby Block A and the East Block limit the degree to which CPT-03 location can be shifted. Item 5 — Measurement of Groundwater Elevations The approximate depth of groundwater can be derived from a pore-pressure dissipation test. This test is conducted by halting the CPT cone at a specified depth and measuring the variation of the penetration pore pressure with time. The cone is held at a specific depth and the pore pressure is monitored until no further change in pore pressure is observed. The depth to groundwater is a function of this equilibrium pore pressure, the unit weight of water, and the depth of the cone. The groundwater depths at the CPT locations will be estimated using this method, and this information will be used in conjunction with the groundwater elevation data from the monitoring wells to augment the groundwater gradient analysis. The groundwater depth estimates which are derived from the CPT data will not be used solely to derive the groundwater gradient. Item 6 — Mixing of Groundwater Groundwater samples are collected using a HydropunchTM or equivalent method. In this method, steel sampling rods with a sacrificial cone at the end are pushed down to the desired depth. PVC casing and screen are then inserted into the steel rods, the rods are retracted by a p:cs grmpAad"ntiDbW=0123.W�dmVkoMnd%g"wp Wa fmduml.o