ARCHIVED REPORTS XR0006092 - Laserfiche WebLink

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PURPOSE AND SCOPE The following report documents the Second Quarter 2001 groundwater monitoring along with the results from the installation of three additional cluster wells and sampling of five continuous core "GeoProbe" borings, see Appendix A - workplan approval and permits Depth to water measurements and groundwater samples were obtained from the five monitoring wells (MWI, MW2, MW3, MW4 and MW5) and the newly installed groundwater recovery cluster well (RIA & B) located at 1876 Country Club Blvd and the two newly installed cluster monitoring wells (MW6 A & B, MW7 A & B) located in the western curb area of Mission Road, 1904 Country Club Blvd , Stockton, CA SITE LOCATION AND DESCRIPTION The site address is 1876 Country Club Blvd , Stockton, CA It is Iocated at the southeast corner of the intersection of Mission Street and Country Club Blvd (Figure 1) The property is located in projected Section 4, TIN, R6E of the MOB&M at approximately five feet above mean sea level On May 1, 2001 Land Surveyors Kjeldsen, Sinnock & Neudeck, Inc surveyed the positions, top of casing and surface elevations of all wells associated with this site, see Appendix B Figures 3 has been revised to this new survey along with Table I All associated figures showing site conditions are based on the new Figure 3 The property previously contained two I000 gallon gasoline Underground Storage Tanks (UST's), product dispensers, and associated underground piping (Figure 3) The UST's, dispensers, and piping were removed from the site in 1989 The property owner originally installed five onsite monitoring wells With this report three additional cluster wells have been installed to aid in the investigation of soil and groundwater conditions at the site LOCAL GEOLOGY AND HYDROGEOLOGY The site is located on surface sails belonging to the Stockton Adobe Clay and Honeycut Clay series They are derived from Recent alluvial fan and floodplain deposits The 40 feet of explored section consisted of clay and silt overlying interbedded lenses of silty and clayey sands below 12 feet This first sandy formation will be designated the A zone aquifer The base of the A zone is at approximately 17 - 18 feet below ground surface (bgs) An aquitard consisting of silty clay approximately 3 to 4 feet thick separates the silty clayey sand A zone aquifer from the B zone aquifer that is found at approximately 21 feet bgs and is approximately 6 to 7 feet thick The B zone aquifer consists of cleaner moderately sorted fine to coarse sand that shows graded bedding (fine to coarse with depth) Beneath the B zone aquifer is stiff clay that extends from approximately 27 feet 4 Sanchez 2nd QM 2001