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San Joaquin Health Services Re: Re-Excavation/Resample Work Plan <br /> March 23, 1992- Page—2 of 3 2150 E. Fremont St. , Stockton, CA <br /> north to the approximate south end of the 12,000 gallon tank. The <br /> .. tanks were approximately ten feet apart and the fills were at the <br /> ends where the tanks were closest together. (See attached drawing <br /> �- #1 ) <br /> Four soil samples were taken from the spoil pile and five from <br /> .. the excavation by GeoAnalytical Laboratories representative at the <br /> direction of Charles Hunt, representative of San Joaquin Health <br /> Services/Environmental Health Division. Spoil samples were taken <br /> at the south and north ends of the spoil from the 10,000 gallon tank. <br /> These samples were recorded as spoil pile sample 1 and 2 respectively. <br /> �. Similarly, the spoil pile samples 3 and 4 correspond to the 12,000 <br /> gallon tank. (See drawing #1 . ) Sample analyses result show 190. mg/kg <br /> TPH-D in spoil pile sample 1 ; 11 ,000. mg/kg TPH-D and 40. ug/kg <br /> Total Xylene in spoil pile sample 2; 1 ,200. mg/kg TPH-D and 13. ug/kg <br /> LM Total Xylene in spoil pile sample 3; and 12. ug/kg Toluene and 11 . <br /> ug/kg Total Xylene in spoil sample 4. <br /> �,. Excavation sample analyses results show "ND" for TPH-D and BTEX <br /> in the sample #10,000 South @ 14' ; 18,000. mg/kg TPH-D and 17. ug/kg <br /> Benzene, 62. ug/kg Toluene, 35. ug/kg Ethyl Benzene, 95. ug/kg Total <br /> Xylene for sample #10,000 North @ '15' ; 280. mg/kg TPH-D and "ND" for <br /> BTEX sample #12,000 South @ 16' ; "ND" for TPH-D and BTEX sample #12,000 <br /> Middle @ 15' ; and "ND" for TPH-D and BTEX sample #12,000 North @ 15' . <br /> (See attached analyses and drawing #1 . ) Spoil pile remains on site at <br /> the edge of the excavation. Excavation remains open pending further <br /> investigation. <br /> ... 5. A. Laboratory that will collect and analyze samples: GeoAnalytical . <br /> Laboratories, Modesto, CA <br /> B. Signed Release of Information attached. <br /> '6. Steps: <br /> A. Investigation: Due to the localized area whi'ch. appears to be contam- <br /> inated, we believe an overexcavation is the most efficient method of <br /> cleanup in this case. Spoil pile samples show very low levels of <br /> contamination in all but one area. Groundwater levels are between <br /> �,. 50 and 60 feet. <br /> L. <br />