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GROUNDWATER <br /> TECHNOLOGY, INC. <br /> OIL RECOVERY SYSTEMS 1832 Tribute Road, Suite G, Sacramento, California 95815 (916)921-18(X1 <br /> October 22 , 1987 <br /> Project Number 202/799-5004 <br /> Mr . Ted Knowles <br /> Knowles Gas Station <br /> 1140 West Hammer Lane <br /> Stockton , CA 95206 <br /> RE : MONITORING WELL INSTALLATION AND <br /> SAMPLING RESULTS FOR <br /> KNOWLES GAS STATION, 1140 BEST <br /> HAMMER LANE , STOCKTON, CALIFORNIA <br /> Dear Mr . Knowles : <br /> This letter presents Groundwater Technology , Inc . ' s ( GTI ) <br /> findings from work conducted at the Knowles Gas Station , 1140 <br /> West Hammer Lane , Stockton , California ( see Figure 1 , Location <br /> Map ) . GTI initiated work at the above referenced site following <br /> written authorization by Mr . Frank Laduca on August 13 , 1987 . <br /> The work steps consisted of the drilling and sampling of 3 soil <br /> borings., installing monitoring wells in each boring , collecting <br /> water samples and related laboratory analyses . <br /> Three soil borings were drilled on September 24 , 1987 using a <br /> truck-mounted rig equipped with 8- inch hollow stem augers at the <br /> locations shown on the Site Plan ( see Figure 2 ) . Each boring was <br /> drilled to a total depth of 65 feet below the surface , Soil <br /> samples were obtained at 5-foot intervals beginning approximately <br /> 5 feet below grade to the bottom of each boring . Samples were <br /> obtained during drilling using a 3 - inch outside diameter <br /> ( O . D . ) split spoon sampler lined with three 2 . 5-inch diameter by <br /> 6- inch long brass sample tubes ( see Attachment 1 , Drill Logs ) . <br /> The sampler was driven 18 inches ahead of the augers at each <br /> sample point . The soils were then evaluated for the presence of <br /> volatile organic constituents by field inspection and field <br /> analysis using a photo-ionization detector ( PID ) . Selected soil <br /> samples were sealed , capped , labeled and packed on ice in an <br /> insulated cooler for subsequent delivery to GT Environmental <br /> Laboratories (GTEL ) accompanied by a Chain-of-Custody manifest . <br /> Soil sampling was conducted in accordance with GTI ' s Standard <br /> Operating Procedures ( SOP ) 11 , 14 and 15 ( see Attachment III ) . <br /> Offices thrrmgturut the U.S., Ca7wda and Overseas ' <br /> Western offices in C(mcord, CA; Torrance, CA;Eng1m000d, CO; Tempe. AZ G <br /> l' i, <br /> I O� <br /> w'►� <br />