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i <br /> WESTERN 1386 BAST BEANIER s I-REET <br /> GEO-ENGINEERS WOODLAND CA 600 <br /> (530) 668-568-5 300,, <br /> CALIF CONTRACTOR#513857 FAX(530)662-0273 <br /> REGISTERED GLOLOGIS I'S we,gca mother com <br /> JUL Y-SEPTEMBER 1998 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> FOR ARC PUMP& WELDING, 1211 SO. TURNPIKE RD., <br /> STOCKTON, CA <br /> JANUARY 13, 1999F- iL; <br /> MAY 1 1999 <br /> PURPOSE AND SCOPE ENVIHuNMEN IAL HC--ALTH <br /> PERNAtT SERVICr� <br /> The following report documents the Third Quarter 1998 collection and certified <br /> laboratory analysis of groundwater samples from three 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, R6E, 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 Iate 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 three monitoring wells in the course of investigating the <br /> 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 50 feet of <br /> explored section at the site consisted of light brown silty clay with lenses of sandy clays <br /> and silts <br />