SU0004126 - Laserfiche WebLink

Home Browse Search

SCO f o o • fresh water. Water will be supplied by on-site wells and pumps. Groundwater levels in the area average 75 feet above mean sea level, ranging from 70 to 84 feet below the existing I ground surface on the project site. The mining pits will be excavated to depths below groundwater and there is the potential for aggregate mining to occur below the groundwater level. Both wet and dry pit-mining operations will be analyzed. Tasks- in this section include: TJ lExisting,Setting i • Describe regional and local geology; vertical and horizontal delineation of the extent of water bearing strata relevant to the Project; description of historical groundwater level fluctuations and discussion of information concerning subsidence ';in the vicinity of the California7Aqueduct adjacent to the project site; determination AAA of the current groundwater flow regime (horizontal and vertical fluxes); establish ` local groundwater quality conditions including the identification of any potential '4 sources of contamination in the vicinity of the project site; and determination of current groundwater users and beneficial uses. I • Data collection efforts will include in-house library and file searches, on-line database searches at the California Department of Water Resources (DWR) and the r U.S. Geological Survey, documents and reports made available by San Joaquin ; _. County, and other government and private agencies. For example, well driller's reports for wells within a one-mile radius around the project site will be requested r from DWR following standard procedures. Documents identified or authored by other consultants, e.g., Kleinfelder, that are pertinent to the hydrogeologic analyses will also be reviewed. • An inventory of wells within aone-mile radius about the center of the project site will be assembled and.depicted on a map.—Pertinent well information, groundwater level data,\and available Izydrochemical data will be compiled in tabular and/or graphical formats to facilitate review and presentation._ Hydrochemical data will be evaluated.to establish background water quality Historical benchmark elevations-); '1�in.the vicinity_and'partiWI&Iy along the California Aqueduct Will be compiled and.-' Leval uated.'. • Hydrogeologic data will be depicted in the form of geologic cross section(s) through the project area to "the extent sufficient data exist near the site. Hydrographs, ` contours of equal groundwater elevations, and tabular summaries of existing water quality data will be prepared. Reference information will be provided. Optional Task 1 a Additional Data Collection (If Necessary) E If insufficient data is available to establish the baseline or to determine potential subsidence impacts, additional data collection may be necessary. LSCE will refine knowledge of local hydrogeologic conditions by supplementing historical data records. Under this task, not more than 10 off-site wells {preferably with known construction details) will be identified for the collection of additional water level Fi and quality data to more comprehensively evaluate local groundwater conditions; plat maps from the County Assessors office will be used to determine landowner names and addresses for the candidate wells. A letter will be provided to the owner ` that describes the proposed project and seeks the owner's permission to conduct baseline and possibly future water level and water quality sampling in their well (this letter will also include a well construction form sheet). Initial communications F San Joa uin Counj Communi Development Department 5