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Seaside Model Report October 26, 2007 Data Used 2.0 Data Used 2.1 Previous Work A large number of reports have been prepared on the geology and water resources of the Seaside groundwater basin and adjacent areas, and selected reports were obtained and reviewed during the development of the groundwater model. The reviewed materials include reports on geologic and hydrogeologic investigations by Wagner and others (2002), Clark and others (1997), Greene (1970 and1977), Stall, Gardner & Dunn (1987, 1988, 1990a, and 1990b), Logan (1982). They include reports on water-resource investigations by CH2M/Hill (2005), Yates and others (2002 and 2005), Yates and Rosenberg (2005), Hanson and others (2002), Yates and others (2002), Yates (1988), Durbin and others (1978), and Muir (1982). Additionally, geospatial information was obtained from the California Geological Survey, California Spatial Information Library, California Department of Water Resources, and U. S. Geological Survey. However, the development of the groundwater model relied mostly on the reports by CH2M/Hill (2005) and Yates and others (2005). The report “Hydrogeologic Assessment of the Seaside Groundwater Basin” was prepared by CH2M/Hill (2005) for the California-American Water Co. The report was prepared to facilitate the development of a groundwater management strategy for the Seaside groundwater basin. The report contains a compilation of hydrogeologic information, including maps and cross sections. The report describes the groundwater levels and quality within the Seaside basin. Finally, the report describes the quantification of natural recharge, groundwater pumping, and secondary recharge. Much of this information was incorporated into the model. CH2M/Hill provided data used in preparing the report but not tabulated in the report (CH2M/Hill, Terry Forman, written communication, 2005), including the computational details of the recharge estimates. The report “Seaside Groundwater Basin: Update on Water Resource Conditions” was prepared by Yates and others (2005) for the Monterey Peninsula Water Management District. The report was prepared to assist the District in developing a comprehensive groundwater-management plan of the Seaside groundwater basin, implementing management actions, and securing grant funding. The report is similar to the CH2M/Hill (2005) report in that it: contains a compilation of hydrogeologic information, including maps and cross sections; describes the groundwater levels and quality within the Seaside basin; and describes the quantification of natural recharge, groundwater pumping, and secondary recharge. Much of this information was incorporated into the model or otherwise significantly influenced the model development. 2.2 Hydrogeologic Information To develop a hydrogeologic model for the groundwater model, hydrogeologic information was extracted from CH2M/Hill (2005), Yates and others (2005), Greene 9
Seaside Model Report October 26, 2007 Data Used (1977), Greene (1970). Within the CH2M/Hill (2005) report: Figure 3-5 shows fault locations, except for the Reliz Fault; Figures 3-6 through 3-11 show geologic cross sections; and Figure 3-12 and 3-13 respectively show the regional and surficial geology. Within the Yates and others (2005) report: Figure 3 shows the regional geology and the location of the Reliz Fault; and Figures 3 and 4 show geologic cross sections. This information was supplemented with topographic and bathymetric information downloaded from the U. S. Geological Survey as DEMs (digital elevation model). Additionally, geologic information was downloaded from the U. S. Geological Survey as isopach maps representing the offshore geology (Wong and Eittreim, 2001). The hydrogeologic model incorporated within the groundwater model was constructed from Figures 1.5a-e, which show the base altitude for each of the hydrogeologic units represented in the model. Contours of base altitude were developed from extrapolations of the cross sections constructed by CH2M/Hill (2005) and Yates and others (2005). They also were developed from the geologic descriptions of Greene (1970) and Greene (1977), and Wong and Eittreim (2001). To translate Figures 1.5a-e into the model mesh, the contours were converted to raster grid files using the 3D Analyst and Spatial Analysis extensions of ArcGIS. Aquifer-parameter information has been compiled by CH2M/Hill (2005) and Yates and others (2005). The compiled aquifer-test data suggest an average hydraulic conductivities of 100 ft/day for the Paso Robles Formation and 130 ft/day for the Santa Margarita Formation. However, because wells tend to be screened in the more conductive intervals of a formation, the aquifer-test results likewise tend to overstate the depth-averaged conductivity for the entire formation thickness. Accordingly, Yates and others (2005) derived hydraulic conductivities of 2 ft/day for the Paso Robles Formation and about 4 ft/day for the Santa Margarita Formation, based on the calibration of a groundwater model, where these conductivities represent the entire thicknesses of the respective formations. Yates and others (2005 also derived from the model calibration a specific yield of 0.08 and specific storages in the range 10 -5 to 10 -6 ft -1 . 2.3 Well Inventory To define the monitoring and production locations within the Seaside groundwater basin, a well inventory was compiled. CH2M/Hill (Terry Foreman, 2005, written communication) provided information on the location and construction of monitoring and production wells within the Seaside groundwater basin. The provided information was supplemented with data extracted from Yates and others (2005, Appendix C). Table 2.1 lists the information compiled on the monitoring wells actually used in developing the model, and Figure 2.1 shows the well locations. Table 2.2 lists the information compiled on production wells, and Figure 2.2 shows the well locations. Additionally, Tables 2.1 and 2.2 identify the hydrogeologic units within the screened interval of the monitoring or projection well. As shown on Figures 2.1 and 2.2, the well inventory included wells outside the study areas used by CH2M/Hill (2005) and Yates and others (2005). 10
Page 1 and 2: GROUNDWATER FLOW AND TRANSPORT MODE
Page 3 and 4: Seaside Model Report October 26, 20
Page 13: Seaside Model Report October 26, 20
Page 39 and 40: Tables
Page 41 and 42: Table 2.2 Monitoring Wells Location
Page 43 and 44: Table 2.3 Merasured Groundwater Alt
Page 45 and 46: Table 2.4a California American Wate
Page 47 and 48: Table 2.4c Annual Pumping from Priv
Page 49 and 50: Table 2.6 ET Corresponding to 1993
Page 51 and 52: Table 3.2 Groundwater Budget for 20
Page 53 and 54: Table 4.2 Groundwater Budget for 20
Page 55 and 56: ® Monterey Bay Marina Seaside Mode
Page 57 and 58: ® Monterey Bay Reliz Fault Ord Ter
Page 59 and 60: NW Monterey Bay Coastline SE El Tor
Page 61 and 62: -700 ® Monterey Bay -600 -500 -120
Page 63 and 64: ® -300 Monterey Bay -75 -200 -100
Page 65 and 66:
® Monterey Bay Model Boundary DWR
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® -20 -10 Marina Monterey Bay 10 0
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® Marina Monterey Bay Seaside Seaw
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® Monterey Bay Marina X X X X X Se
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® Monterey Bay Model Boundary NDVI
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® Castroville Salinas North Monter
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® Figure 3.2 Finite-element Mesh
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NE SW Seaside Fault Relize Fault Or
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Δh Δh z t-1 Case of Small h z >z
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Well C A C B B A L Δz e Le be Elem
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0 -5 Specified Head (ft) et) -10 -1
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® Monterey Bay Figure 3.10b Initia
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® Monterey Bay Figure 3.11b Initia
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2.0 1.5 Weighted Computed Head (ft)
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® Monterey Bay Figure 3.13b Comput
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® Monterey Bay Figure 3.14b Comput
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® Monterey Bay Figure 4.1b Compute
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® Monterey Monterey Bay Bay Monter
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