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Mr. Ron Rowe <br /> Page 3 <br /> is not warranted at this time. Soil contamination was limited to depths between approximately <br /> 20 and 30 feet bgs beneath the former USTs, and initial groundwater was encountered at a depth <br /> of approximately 51 feet bgs. Therefore, approximately 20 feet of uncontaminated soil is <br /> present above groundwater. This suggests that the dissolved petroleum hydrocarbons detected <br /> in the initial groundwater samples collected from MW i on May 24, 1945 may possibly be from <br /> an off-site source or may be a result of soil disturbance during well installation. <br /> Ground Zero proposes to monitor and sample the groundwater from MW 1 to determine the <br /> current hydrocarbon levels present in the groundwater. The groundwater samples will be <br /> submitted to a State-certified laboratory and analyzed for total petroleum hydrocarbons as <br /> gasoline(TPHg) using modified EPA method 8015, and for benzene, toluene, ethylbenzene, and <br /> total xylenes (BTEX) using EPA method 8020. <br /> A summary report will be prepared which will include all analytical results and recommendations <br /> for additional work at the site, if appropriate. <br /> If you have any questions or comments regarding this proposed work please contact me at your <br /> convenience. <br /> • Respectfully, <br /> Ground Zero Analysis, Inc. <br /> Jeanne Buckthal \��ERE� GEOZO <br /> Staff Geologist <br /> GREGORY P. <br /> STAHL <br /> No. 5O23 <br /> Gregory P. Stahl, RG 5023 <br /> CA Certified Hydrogeologist 264 ¢ OF CA <br /> pc: Mr. Patrick D. Riddle, Esq. <br /> Mr. Jay Friedman <br /> Mr. Gerald Sperry, Esq. <br /> Ms. Elizabeth Thayer, RWQCB Sacramento <br />