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Veravanc SACRAMENTO <br />etter to Mr. Ulycess Williams <br />ay 16, 1989 <br />Page 5 <br />However, laboratory analyses detected contamination in soil sample BH2- <br />20, which contained 350 ug/kg of TPH and 83 ug/kg of benzene. <br />Table 2, (Leaking Underground Fuel Tank (LUFT) Field Manual, March, <br />1989, edition, issued by the State Water Resources Control Board) is <br />entitled: Leaching Potential Analysis for Gasoline and Diesel Using <br />Total Petroleum Hydrocarbons (TPH) and Benzene, Toluene, Xylene and <br />Ethylbenzene (BTX&E), and is a tool to determine the concentrations of <br />TPH and BTEX that can be left in place without endangering ground water <br />The numbering of rows 1 through 9 has been added to correspond with the <br />following score derivation. <br />1 Minimum depth to ground water is 17 feet: Score 0 <br />2. No fractures are present: Score 10 <br />3. Average annual precipitation is approximately 15 inches. Score 9 <br />4. There are no known man-made conduits: Score 9 <br />5. There are no unique site features. Score 10 <br />6. Column totals- 20 + 18 + 0 = 38 <br />7. Range of total points: column 3; 40 pts or less <br />8 Maximum allowable BTEX levels (ppm): Not applicable <br />9. Maximum allowable TPH levels (ppm)- 10 <br />Based upon this calculation, the maximum allowable TPH in the soil <br />is 28.57 times higher than the level reported in sample BH2-20. <br />CONCLUSIONS AND RECOMMENDATIONS <br />Based upon the information obtained during the site investigation of <br />2400 Airport Way, Stockton, California, the following conclusion is <br />made: <br />A low level of petroleum hydrocarbon contamination is present at the <br />site as a result of previous underground fuel storage tank <br />operations. The level of contamination (less than one ppm TPH) does <br />not present a significant threat to the environment at this time. <br />