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PUBLIC HEALTH SER ICES ,aP�o <br />SAN JOAQUIN COUNTY a <br />ENVIRONMENTAL HEALTH DIVISION ` <br />Karen Furst, M.D., M.P.H., Health Officer Copy <br />304 East Weber Avenue, Third Floor • Stockton, CA 95 0 t FaR' <br />209/468-3420 <br />CHARLES HASTINGS ESQ <br />4568 FEATHER RIVER DRIVE <br />STOCKTON CA 95219 <br />RE: Hayre's Egg Producers <br />12565 S. Manthey Road <br />Lathrop CA 95206 <br />AUG 2 6 1998 <br />RAY KABLANOW <br />GEOLOGICAL TECHNICS <br />2741 RIVER ROAD <br />MODESTO CA 95351 <br />San Joaquin County Public Health Services, Environmental Health Division <br />(PHS/EHD) has reviewed the June 26, 1998 "Tank Closure and Site <br />Investigation Report" prepared by Geological Technics for the above referenced <br />site. <br />The purpose of this investigation was to confirm the presence or absence of two <br />10,000 gallon diesel and two 1,000 gallon gasoline underground storage tanks <br />(UST's), and to determine the extent of any hydrocarbon contamination released <br />from these four tanks. During the course of the investigation additional data was <br />gathered from other locations of suspected contamination. These locations <br />included a drinking water well, the area beneath a former 10,000 gallon above <br />ground storage tank (AST), an abandoned septic tank, a service pit, a waste <br />water sump and a storm water retention pond. <br />There is evidence to indicate that contamination is present from both the 1,000 <br />gallon gasoline UST's and the 10,000 gallon diesel UST's. Diesel has been <br />confirmed in a soil sample from the area of the former 10,000 gallon UST at a <br />concentration of 81 parts per million (ppm). MTBE has been confirmed by EPA <br />Method 8260 at a concentration of .0082 ppm from the area of the 1,000 gallon <br />UST. <br />Samples with the highest concentrations of petroleum hydrocarbons discovered <br />at the site were obtained from soil and ground water beneath the former AST. <br />Diesel was detected in a soil sample at a concentration of 10,000 ppm and total <br />extractable petroleum hydrocarbons were detected in the ground water sample <br />at a concentration of 310,000 parts per billion (ppb). <br />A Division of San Joaquin County Health Care Services <br />