Laserfiche WebLink
SITE GEOLOGY/HYDROGEOLOGY <br /> The site is situated on level terrain The soils at the cemetery property have been mapped by <br /> rthe USDA Soil Conservation Service as Stockton clay (adobe) Stockton clay is a fine-textured, <br /> dark gray to black clay, deposited by quiescent or slow moving water The parent material is <br /> ' of mixed origin, but primarily igneous rock According to the survey some in-place <br /> development of this soil has occurred also The development is a tight clay subsoil and is the <br /> result of transport and redeposition of very fine particles from the top of the soil profile to the <br /> ' subsoil, resulting in a high colloidal clay content and impervious structure in the subsoil <br /> ' The importance of the above soil properties is that when they exist at depth they significantly <br /> contribute to a site's ability to attenuate the impacts of any past releases of petroleum fuels <br /> Deeper litholo and site geology is related to the surface soils The site is mapped b the U S <br /> P gY g gY PP Y <br /> ' Geological Survey as "basin deposits " Basin deposits have lithologic profiles dominated by <br /> fine-textured materials However, intercalating layers of coarser textured materials are common <br /> and usually capable of freely releasing water Municipal water wells drilled in the general area <br /> penetrate through alternating clays and sands to a depth of 250 feet or more before intentionally <br /> ' extracting water Municipal wells are sealed off for the first 250 feet because the upper zones <br /> of saturation do not meet quality standards or do not provide sufficient quantity to be developed <br /> ' (Bulletin 146, California Department of Water Resources, 1967) Therefore, it is highly <br /> unlikely the fuel components at this site have affected or will affect drinking water supplies <br /> There are three irrigation wells on the subject property One irrigation well is located 65 feet <br /> ' south of the former tank locations, the other two are located 650 feet north and 550 feet south <br /> of the former tank locations All water for the site, including sinks and restrooms in the office <br /> ' is supplied by the irrigation wells, except for drinking water, which is bottled Also, a septic <br /> tank/leach field system is located to the southwest of the tank area Well logs and nearby well <br /> ' locations, within a one-half mile radius, have been obtained from the Department of Water <br /> Resources (DWR) and are shown on Figure 4 <br /> ' R-021492 LF 4 <br />