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ATT -Lodi <br /> ATC Project No 75 75128 0001 <br /> Page 2, January 19, 2001 <br /> south and east The diesel fuel impacted groundwater appeared to be Iaterally confined to an area <br /> approximately 60 feet long by 35 feet wide Diesel fuel was found at a maximum reported <br /> concentration of 150 micrograms per liter (ug/L) adjacent to the UST excavation, and attenuated <br /> to a concentration of 58 ug/L, 20 feet farther to the south No BTEX or MTBE was detected in <br /> the groundwater samples collected from the borings, with the exception of total xylenes detected <br /> ' in the sample from one boring at 1 2 ug/L <br /> 3.0 PURPOSE AND SCOPE OF SERVICES <br /> The investigation outlined in this report was primarily designed as a limited program of exploratory <br /> dnlling, soil sampling, and chemical testing of selected soil samples at the above-mentioned site The <br /> program was designed to help fbrther assess the lateral and vertical extent of gasoline constituents in <br /> the soil and groundwater onsite Specifically, these tasks included <br /> A Installing and developing three (3) groundwater monitoring wells, <br /> A Collecting soil samples at approximately 5-foot intervals of depth in the borings, <br /> A Chemically testing groundwater samples by a California state-certified analytical <br /> laboratory, <br /> A Surveying the locations and the relative surface elevations of the installed groundwater <br /> monitoring wells, and <br /> n Preparation a report summarizing the subsurface investigation with findings, conclusions <br /> and recommendations <br /> 4.0 INVESTIGATION AND LABORATORY METHODS <br /> 4.1 FIELD PROCEDURES <br /> iAll site activities were conducted under the direct supervision of a State of California Registered <br /> Geologist having five or more years of professional experience in groundwater hydrology The field <br /> operations were supervised by a qualified Geologist designated by the supervising Registered <br /> Geologist All field operations personnel were trained in accordance with 29 CFR 1910 (40-hour <br /> OSHA health and safety training) Untrained field operations personnel or visitors were not allowed on <br /> Ithe site during field operations <br /> 4.2 EXPLORATORY SOIL BORINGS <br /> Three (3) vertical soil borings, designated MW I through MW3 were drilled to a depth of 38 feet bgs <br /> using a truck-mounted CME-75 drill rig with an 8-inch diameter hollow-stem auger Groundwater <br />