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�C <br /> HEALTH SERICESPUBLTC <br /> SAN JOAQUIN COUNTY a �< <br /> 1 <br /> JOGI KHANNA NLD.M.P.H. :• <br /> Health Officer <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) <br /> Stockton, California 95201 4 r F 6,0L <br /> (209) 468-3400 <br /> F KURT MILLER CC =� <br /> SHELL OIL COMPANY DEC 2 7 1991 <br /> P O BOX 5823 <br /> CONCORD CA 94524 <br /> RE: Shell Service Station IN REPLY REFER TO SITE CODE: 1906 <br /> 420 W. Kettleman <br /> Lodi, CA <br /> San Joaquin County Public Health Services, Environmental Health Division has reviewed a letter response <br /> dated August 9, 1991,prepared by Aegis Environmental. The letter refers to allowable limits in soil for TPH <br /> as gasoline and BTEX based on Table 2-1 (Leaching Potential Analysis for Gasoline and Diesel) in the LUFT <br /> Manual. This table was designed for use with soil sample results from soil samples taken from an <br /> underground tank excavation not soil sample results taken from soil borings. When table 2-1 or table 2-3 <br /> (Environmental Fate Worksheet) are used the depth to groundwater is determined by seasonal high ground <br /> water. Seasonal high ground water as determined by San Joaquin County Flood Control Maps in Spring <br /> 1986 for this site is 45 feet. Average annual precipitation in San Joaquin County is 14 inches and there is <br /> a City of Lodi well near this site. All these factors are to be accounted for when completing Table 2-1. <br /> When Shell removes the existing underground storage tanks at this site soil samples will be taken from <br /> beneath the tanks and soil samples should be taken from the new tank excavation as stated in the Aegis <br /> "Pre-Tank Replacement Site Assessment Results Report"dated October 16, 1989. The results from these soil <br /> samples may be evaluated using the Leaching Potential Analysis Table 2-1. <br /> Should Shell not install a monitoring well southeast of the existing and proposed tank excavations they must <br /> continue quarterly monitoring until further site information can be evaluated. <br /> Please be advised that ARCO'S monitoring well#12,placed in the sidewalk west of Shell,evidenced benzene <br /> (6.9 parts per billion) and TPH-gasoline (90 parts per billion) in the water sample taken July 1991. In <br /> addition ARCO has installed an extraction well but it is not in use. <br /> If you have any questions contact Margaret Lagorio, Senior REHS, of my staff at (209) 468-3449. <br /> Jogi Khanna, .D.;HS, <br /> .P.H. <br /> Health O <br /> v v <br /> tie A. Cotulla, Program Manager <br /> nvironmental Health Division <br /> LAC/ML:lb <br /> C. Aegis Environmental <br /> 1050 Melody Lane, Su. 160 <br /> Roseville, CA 95678 <br /> A Division of San Joaquin Counry Health Care Services <br />