HYDROGEOLOGIC CONCEPTUAL MODEL NEW BEDFORD- COLDWATER BASIN
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1 HYDROGOLOGIC CONCPTUAL MODL NW BDFORD- COLDWATR BASIN The following is a summary of the hydrogeologic conceptual model for the proposed new Bedford- Coldwater Basin. 1. Description of Principal Aquifer Units The new Bedford-Coldwater Basin is composed of alluvial fan, alluvial valley, axial channel, and wash deposits. These deposits are sourced from the Santa Ana Mountains to the west of the Basin and the Peninsular Ranges to the east of the Basin. The Bedford Canyon Formation (a slightly metamorphosed sedimentary formation composed of interlayered argillite, slate, graywacke, conglomeratic graywacke, impure quartzite, and small masses of limestone and quartz-rich metasandstone) and adjacent granitic rocks are the primary source materials for these alluvial deposits. The alluvial fan deposits in the Coldwater area (Figure 5) extend into the Bedford area and appear to have been disrupted by faulting (Figures 2 and 3). Channel deposits along Temescal Wash and local tributaries define the eastern boundary of the new basin. In the northern Bedford area, a variety of Tertiary sedimentary units crop out including the Silverado (Paleocene), Vaqueros (Miocene), Topanga (Miocene), and Puente (Miocene) formations (Figure 2). As such, the character of the deposits and the groundwater chemistry differ from the alluvial fans to the north in the Temescal Subbasin and those to the south in the lsinore Groundwater Basin. Both older and recent alluvial fans have been deposited along the mountain front on the western edge of the new Bedford-Coldwater Basin. These fans have prograded across both the Coldwater and Bedford areas from west to east. Although these deposits are relatively thick, the entire unit is heterogeneous. Sand lenses within the fan deposits collectively form the Alluvial Fan Aquifers. These aquifers range up to over 7 feet in thickness in the Coldwater area (western portion of the new Bedford-Coldwater Basin) (Todd and AKM, 28). An analysis of groundwater conditions in the Bedford area was conducted in support of a recycled water feasibility study conducted for Lee Lake Water District (now Temescal Valley Water District, TVWD) (Todd and AKM, 28 Appendix D). Very few wells in the Bedford area have sufficient groundwater elevation records to examine long term trends. The available data show that groundwater elevations in the Bedford area have fluctuated about 6 feet over the last 5 years, and high groundwater levels are within 1 feet of ground surface (Todd and AKM, 28). A review of recent water levels (data included in the CASGM online database) indicates that water levels have fluctuated only about six feet over the last four years for two wells located in the east-central portion of the proposed Bedford-Coldwater Basin. Water levels in the Coldwater area are illustrated by the hydrograph from City Well No. 3 on Figure 7. As shown on the graph, water levels have declined over the last 5 years with significant fluctuations in response to wet and dry cycles. Water levels in Coldwater area have varied more than 35 feet over the
2 last 5 years, from a high of 1,112 feet above mean sea level (msl) (26 feet below ground surface) in May 1983 to a low of 739 feet msl 1 (399 feet below ground surface) in October 29. Five major cycles of groundwater elevation recovery and decline are illustrated on the hydrograph: from approximately 1964 to 1977, 1977 to 1991, 1991 to 24, 24 to 29, and 29 to 215. Several minor cycles of water level fluctuations are evident within these major cycles. Some of the fluctuations (approximately 2 feet between measurements) are also potentially influenced by incomplete recovery of pumping water levels in the well. The wide water level fluctuations over time in the Coldwater area also reflect the relatively small footprint and compartmentalization of the area. The area covers only about 2, acres and is surrounded on the west, north, and south by bedrock. In addition, communication with the adjacent Bedford area is impeded in places by the North Glen Ivy fault (Todd and AKM, 28). Recent water levels are approximately 8 feet msl (approximately 34 feet below ground surface) and reflect a recovery of approximately 6 feet from the historical low reached approximately six years ago in 29. This recovery is due, in part, to a 28 production agreement between Corona and VMWD for the Coldwater portion of the proposed new Bedford-Coldwater Basin where most of the pumping occurs. Through this legal agreement, groundwater extractions are now tied to a perennial yield for the area. By limiting pumping, water levels are being more effectively managed in the area. This management will continue and will be unaffected by the basin boundary modification request. 2. Description of Lateral Boundaries 2.a. Geologic Features Impeding or Impacting Groundwater Flow The new Bedford-Coldwater Basin would be defined by the lateral extents of the alluvial material described above. This material is bounded by bedrock in the Santa Ana Mountain on the west and the Peninsular Ranges to the east. The southern and northern boundaries of the Basin are formed by areas of thin alluvial material over shallow bedrock in narrow valleys (Todd and AKM, 28 and WI, 215). Groundwater flow in the new Bedford-Coldwater Basin is affected by the Glen Ivy fault shown on Figure 3. (Todd and AKM, 28 and WI, 215). The Coldwater area of the Basin is located within a downdropped block between the Glen Ivy fault and the Santa Ana Mountains. The Glen Ivy fault impedes groundwater flow from the west to the east within the Basin, resulting in limited hydraulic connection between the Coldwater ad Bedford areas. However, these areas appear to be well-connected when groundwater elevations in the Basin are high (Todd and AKM, 28), indicating more compartmentalization with depth. 2.b. Aquifer Characteristics Significantly Impeding or Impacting Groundwater Flow The new Bedford-Coldwater Basin is thin in some areas, which impedes groundwater flow. This is especially relevant at the northern and southern boundaries of the Basin, as has been described in other 1 This historic low water level may be influenced by pumping conditions (or incomplete recovery) in this well. A historic low water level that represents a static measurement was recorded in November 21 at 756 feet msl, 17 feet higher than the previously-recorded measurement.
3 sections. With the exception of the Glen Ivy fault described above, there are no other known aquifer characteristics impeding or impacting flow in the new basin. 2.c. Significant Geologic and Hydrologic Features of Principle Aquifer Units The units in the new Bedford-Coldwater Basin are truncated by the Glen Ivy fault that separates the Bedford area from the Coldwater area. The location and effect of the Glen Ivy fault on the units of the Basin are shown on cross sections on Figure 15 of Todd and AKM, 28 and Figure 3-3c of WI, 215. As shown on these cross sections, the Glen Ivy fault offsets the units by approximately 2 to 25 feet. The fault generally impedes groundwater flow, backing up groundwater west of the fault within the Coldwater area and limiting flow into the Bedford area. The aquifer is unconfined throughout the new Bedford-Coldwater Basin, and there are no facies changes within the Basin that affect groundwater flow. Groundwater flow in the new Bedford-Coldwater Basin is generally from south to north in the Bedford area and from west to east in the Coldwater area. Groundwater elevations and flow directions in the entire Basin are shown on Figures 26 and 27 of Todd and AKM, 28. Additional groundwater elevation maps of the Bedford area are shown on Figures 3-5 and 3-6 of WI d. Key Surface Water Bodies, Groundwater Divides and Significant Recharge Sources The key surface water bodies in the new Bedford-Coldwater Basin are Temescal Wash, Bedford Wash, Brown Canyon, Bixby Canyon, Anderson Canyon, Coldwater Canyon, Mayhew Canyon, Dawson Canyon, Olsen Canyon, and several unnamed drainages entering the Basin from the west and east. With the exception of the Temescal Wash, these are all ephemeral drainages. However, they are all fed by relatively large watershed areas in the mountains surrounding the basin and receive large volumes of runoff during precipitation events. As a result, these drainages are important sources of recharge to the new Bedford-Coldwater Basin. 3. Recharge and Discharge Areas Recharge to the new Bedford-Coldwater Basin occurs primarily from infiltration of runoff, and to a lesser extent from deep percolation of precipitation, urban, agricultural, and industrial return flows, wastewater recharge, and subsurface inflow from outside the Basin. Most of the basin recharge comes from the infiltration of runoff from precipitation in the Santa Ana Mountains west of the Basin and the Peninsular Ranges east of the Basin. Large amounts of runoff from the mountains flow in unlined channels into and through the Basin. The amount of water available for recharge varies annually with changes in rainfall and runoff. Runoff into the new Bedford-Coldwater Basin is subject to evapotranspiration, infiltration, and continued surface flow to the Temescal Wash. The watersheds contributing to the Basin include multiple drainages, all of which flow across the Basin in generally east-west orientations. Runoff from some of these drainages is captured and diverted to gravel pits or spreading areas for groundwater recharge in the subbasin (Todd and AKM, 28). Wet years generate large amounts of water that exceeds the recharge capacity of the basin (Todd and AKM,
4 28). On average, infiltration of runoff accounts for over 8 percent of the annual recharge to the new Bedford-Coldwater Basin (Todd and AKM, 28). Deep percolation of precipitation is the process by which precipitation enters groundwater. Recharge to groundwater from deep percolation occurs throughout the basin and accounts for approximately eight percent of total recharge (Todd and AKM, 28). Return flows are those portions of applied water (e.g., landscape irrigation) that are not consumed by evapotranspiration and returned to the groundwater system through deep percolation or infiltration. Return flows associated with urban, industrial, and agricultural water uses account for approximately seven percent of annual recharge in the new Bedford-Coldwater Basin (Todd and AKM, 28). Discharge from wastewater treatment and subsurface inflow occur to a limited extent in the new Bedford-Coldwater Basin. Recharge associated with wastewater occurs in the discharge ponds at the wastewater treatment facilities, and accounts for approximately two percent of total annual recharge (Todd and AKM, 28). Subsurface inflow occurs along the Basin boundaries. This is not considered to be a significant source of recharge to the Basin, accounting for only one percent of annual recharge (Todd and AKM, 28). Discharge from the new Bedford-Coldwater Basin is almost entirely from groundwater pumping. There is some limited discharge across the northern Basin boundary with the Temescal Subbasin of the Upper Santa Ana River Basin, but the thin alluvial material in this area limits the volume and timing of subsurface outflow along this boundary (Todd and AKM, 28). 4. Definable Bottom of the Basin The basin bottom is defined by bedrock, which is shallow around the perimeter and deep in the center. Depth to bedrock ranges in depth from 1 feet to approximately over 7 feet (Todd and AKM, 28 and WI, 215). Aquifer thickness is greatest in the Coldwater portion of the Basin west of the Glen Ivy fault, as shown in the attached Figure 7 of Appendix D of Todd and AKM, Description of Temescal Subbasin Related to Proposed New Bedford-Coldwater Basin Northern Boundary Although the basin boundary modifications do not substantially affect the Temescal Subbasin, the southern boundary is slightly revised. For completeness, information on this the subbasin including this affected area is provided below. A more complete description of the hydrogeological conceptual model for the Temescal Subbasin is provided in the Corona GWMP (Todd and AKM, 28), attached to this basin boundary modification request. The Temescal Subbasin is bounded on the west by the Santa Ana Mountains, the east by low-lying hills of l Sobrante de San Jacinto and La Sierra, and the north by the Chino Subbasin and the Santa Ana River. The northeastern area is marked by a series of low-lying hills around the City of Norco area. The southern boundary is described in Bulletin 118 as the constriction of alluvium along Temescal Wash (at
5 Bedford Canyon). The proposed revisions to this southern boundary do not change this description substantially. The modification moves the boundary to the north (approximately 2, feet) to coincide with a small topographic high in the older alluvial deposits. This functions as a local groundwater divide for Bedford Wash and keeps the entire wash within the new Bedford-Coldwater Subbasin. Aquifers within the Temescal Subbasin include the alluvial fans that are sourced from uplands west of the basin, channel deposits, and other alluvial units. There are some Tertiary-age sandstone units that also provide relatively low yields from groundwater wells. The bottom of the basin is defined by older consolidated units and volcanic and metamorphic bedrock. The depth to bedrock is shown in the GWMP (Figure 1). In general groundwater flows from south, east, and west toward the basin center and then northwest toward the basin discharge in the Prado Management zone along the Santa Ana River. Subsurface inflow occurs primarily along the western perimeter, beneath the Temescal Wash channel from the south, and through the Arlington Narrows to the east (where the Temescal Subbasin joins the Riverside-Arlington Subbasin). Recharge also occurs from recharge ponds and direct infiltration from precipitation. In addition to subsurface outflow, Corona wells in the northern portion of the subbasin account for most of the groundwater discharge from the basin. A more complete water budget is included in Section 3 of the GWMP (Todd and AKM, 28). The revised southern basin boundary occurs within older alluvial deposits with relatively low permeability. There are no known active groundwater wells in the affected area. The revised southern boundary does not affect substantially any of the hydrogeologic information described above.
6 ( 3,5 7, Scale in Feet Temescal Subbasin of Upper Santa Ana Valley Basin (8-2.9) N Current lsinore Basin (8-4) Temecula Valley Basin (9-5) Qyls Qw Qof Qf Qoa Qc Kt Jbc Kdvg Kd Jbcm Kgbf Kgb Trmu Kpvgr Khg Trmq Kpvp Kvsp Kgh Qov Tp Klhs Kght Qls Qols Tlm Klbc Katg Ql Qvof Tcgr Ktru Kcto Kpvg Kvspi Qyw Qvoa Tcg Ktrl Kcg Kpvgb Kvem Trms Qyf Qps Tvsr Kgr Kcgd Ksmg Kvr Trmm Qya Qpf Tvep Kgg Kct Kgu Ksv Water Body Qyv QTws Tt Kgt Kcgq Kgd Kvs Trmgp Tsi QTn Kcgb Tf QTt Kgti Tvs Kgtf Qaf Tcga Legend Path: T:\Projects\Corona 4649\GIS\Maps-215Basin Boundary\Maps\Figures\Figure 2 - Geology abd Basin Boundaris.mxd Trmp Temescal Subbasin of the Upper Santa Ana Valley Groundwater Basin (8-2.9) Current lsinore Groundwater Basin (8-4) Temecula Valley Groundwater Basin (9-5) Source: Surficial geologic units, USGS Preliminary Digital Geologic Map, 3' X 6' Santa Ana Quadrangle, Version (Open File Report , March 216 Figure 2 USGS Geologic Units Current lsinore Basin
7 (N Temescal Subbasin of Upper Santa Ana Valley Basin (8-2.9) 3,5 7, Scale in Feet Current lsinore Basin (8-4) Freeway Fault Glen Ivy Fault Sedco Fault Glen Ivy Fault Glen Ivy Fault Rome Fault Wildomar Fault Willard Fault Path: T:\Projects\Corona 4649\GIS\Maps-215Basin Boundary\Maps\Figures\Figure 3 - Alluvial vs Bedrock and Basin Boundaris.mxd Legend Faults Proposed Bedford-Coldwater Basin (8-1) Proposed lsinore Basin Boundary Modifications (8-4) Alluvial Deposits Non-Alluvial Deposits Water Body Proposed New Bedford-Coldwater Basin (8-1) Temescal Subbasin of the Upper Santa Ana Valley Groundwater Basin (8-2.9) Current lsinore Groundwater Basin (8-4) Temecula Valley Groundwater Basin (9-5) Source: Surficial geologic units, USGS Preliminary Digital Geologic Map, 3' X 6' Santa Ana Quadrangle, Version (Open File Report , Proposed lsinore Basin Boundary Modifications Temecula Valley Basin (9-5) March 216 Figure 3 Alluvial Deposits and Proposed Boundary Modifications
8 N ( Canyon Lake 3,5 7, Scale in Feet San Jacinto River Temescal Wash Warm Springs Area Lee Lake Bedford Area Lee Lake Area lsinore Area Lake lsinore Coldwater Area Path: T:\Projects\Corona 4649\GIS\Maps-215Basin Boundary\Maps\Figures\Figure 5 - Proposed lsinore Basin Areas.mxd Bedford Wash Proposed New Bedford-Coldwater Basin (8-1) Legend Proposed Bedford-Coldwater Basin (8-1) Proposed lsinore Basin Boundary Modifications (8-4) Proposed lsinore Basin Boundary Modifications March 216 Figure 5 Key Areas within Proposed lsinore Basin Boundary
9 Water Levels in City of Corona Well No. 3 Bedford-Coldwater Basin ,2 Ground Surface levation 1,138 feet msl 1,1 Groundwater levation, feet msl 1, Date March 216 Figure 7 Bedford-Coldwater Basin Hydrograph
10 D D West ast Miles levation, feet msl LGND DWR Well Number Water Level Well Screen Bottom of Well Groundwater levation (dashed where estimated) 5847 North Glen Ivy Fault Glen Ivy Fault Inferred Glen Ivy Fault Splay Granitic Bedrock (Corona #2) Santa Ana Mountains Coldwater Subbasin Bedford Subbasin Granitic Bedrock Temescal Wash Alluvial Fan Aquifer Granitic Bedrock Alluvial Fan Aquifer levation, feet msl North Unnamed Fault South Granitic Bedrock Miles Alluvial Fan Aquifer (51683 (Corona # 21) Corona # 1 Corona # (Corona # 2) 5/6-11K Coldwater Subbasin May 28 TODD NGINRS Alameda, California Figure 15 Cross Sections D - D and -
11 Water Levels in City of Corona Well No. 3 Coldwater Subbasin ,2 Ground Surface levation 1,13 feet msl 1,1 Groundwater levation, feet msl 1, Date May 28 TODD NGINRS Alameda, California Figure 24 Coldwater Subbasin Hydrograph
12 LGND 5 Water Level Contours, feet msl Direction of Groundwater Flow Norco Fault Prado Dam Arlington Gap Possible Groundwater Divide Noth Glen Ivy Fault N Scale in Miles 2 May 28 TODD NGINRS Alameda, California Figure 26 Water Levels Spring 1964
13 LGND 5 Water Level Contours, feet msl Norco Direction of Groundwater Flow Fault Prado Dam Arlington Gap Possible Groundwater Divide Noth Glen Ivy Fault N Scale in Miles 2 May 28 TODD NGINRS Alameda, California Figure 27 X Water Levels Spring 1984
14 N 3, Scale in Feet May 28 TODD NGINRS Alameda, California Figure 7 Depth to Bedrock
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