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WESTERN 1386 i_A5 1131 AMLR 51 RL'i r <br /> GEO-ENGINEERS WOODLAND CA 95776-6003V- WHE0 - (530) 668-5300 <br /> . CALir C.ON rRAC I OR#5I 3857 I AA (530)662-0273 <br /> REGISFE:RrD GroLQG15I S u,m <br /> JUL Y SEPTEMBER 2001 <br /> QUARTERLY GROUNDWATER MONITORING REPORT �'- <br /> FOR ARC PUMP & WELDING, 1211 SO. TURNPIKE RD., ; <br /> STOCKTON, CA <br /> OCTOBER 29, 2001 <br /> PURPOSE AND SCOPE <br /> The following report documents the Third Quarter 2001 collection and certified <br /> laboratory analysis of groundwater samples from four monitoring wells located at Arc <br /> Pump and Welding, 1211 So Turnpike Road, Stockton, CA <br /> SITE LOCATION AND DESCRIPTION <br /> The site address is 1211 So Turnpike Road, Stockton, CA The 0 33 parcel is located at <br /> the northeastern corner of the intersection of Commerce Street and So Turnpike Road in <br /> an area zoned for light manufacturing and industrial use (Figure 1) The property is <br /> located in projected Section 14, TIN, ME, of the MDB&M at approximately 12 feet <br /> above mean sea level (Figure 2) <br /> The property previously contained one 500 gallon gasoline Underground Storage Tank <br /> (UST), that was used to store leaded and unleaded gasoline from the late 1950's or early <br /> 1960's through 1987 (Figure 3) The UST, product dispenser, and associated <br /> underground piping were removed from the site in 1987 <br /> The property owner has installed four groundwater monitoring wells in the course of <br /> investigating the soil and groundwater conditions at the site <br /> LOCAL GEOLOGY AND HYDROGEOLOGY <br /> The site is located on surface soils belonging to the Stockton Adobe Clay series These <br /> soils are derived from Recent alluvial fan and floodplain deposits The 80 feet of <br /> explored section at the site consisted of stiff clay and silt with 2-4 foot thick layers of fine <br /> 40, to medium sand at approximately 20, 55, 60, and 78 feet bgs <br />