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Ms. Terry Hernandez <br /> • _ 2 _ • 18 September 2013 , <br /> 931 S. Oro Ave., Stockton <br /> San Joaquin County <br /> 28.5 ug/L (also between the Reporting Limit and the Method Detection Limit) in the toilet tank. The <br /> laboratory believes the diesel and gasoline results were actually a measurement of the surrogate (carbon <br /> range marker) used to calibrate the equipment. The values for diesel and gasoline are below the <br /> laboratory Reporting Limit, and the data are qualified as estimates. <br /> There are no drinking water standards for gasoline or diesel. The water quality objective for gasoline is <br /> 5 ug/L, the water quality objective for diesel is 56 ug/L based on taste and odor concerns. The sample <br /> results from your resident exceed the water quality objective for gasoline however, since the laboratory <br /> believes these results are indicative of the quality control procedures used in calibrating the equipment, <br /> you should not experience a taste or odor issue. <br /> Excelchem detected oil and grease, bromodichloromethane, and chloroform in both samples collected <br /> from your residence. Acetone was reported in the sample collected at the toilet tank. Acetone is a <br /> common laboratory contaminant due to use in cleaning the equipment. Chloroform, also reported in both <br /> the samples collected from your residence, is a breakdown product of chlorine used in the purification <br /> process in municipal water supply. Bromodichloromethane is also a byproduct of municipal water <br /> disinfection by chlorination. <br /> In conclusion the only chemicals detected in your toilet tanks and the outdoor spigot at levels that can be <br /> quantified by the laboratory are oil and grease. The carbon range analysis indicates the concentration of <br /> oil and grease was nearly 100 times higher than the concentrations of gasoline or diesel detected in the <br /> samples. The analysis of the carbon chains indicates these oils are not related to petroleum and more <br /> like resemble a vegetable oil. Given the groundwater monitoring data collected from the Jamar Service <br /> station that show decreasing levels of petroleum hydrocarbons in the direction of your resident and the <br /> analysis of samples collect from your residence we do not believe the discoloration you observed in the <br /> toilet tank is from the neighboring service station. <br /> San Joaquin County Environmental Health Department will however, continue to direct additional work at <br /> the Jamar Service Station until cleanup meets the criteria established to be protective of human health <br /> and the environment. If you have any questions on the health effects from exposure to any of these <br /> chemicals, please contact Lisa Medina, San Joaquin County Environmental Health Department at (209) <br /> 468-3455. <br /> If you have any questions regarding this data, please do not hesitate <br /> (916) 464-4615 or via email at jim.barton@waterboards.ca.gov. APPROVED <br /> Author J L <br /> James L.L. Barton, PG <br /> Engineering Geologist senior <br /> Attachment: Excelchem Environmental Labs Report 1308198 <br /> cc: Sriram Iyer, State Water Resources Control Board, UST Cleanup Fund, Sacramento <br /> Adrienne Ellsaesser, San Joaquin County Environmental Health Department, Stockton <br /> Steve Cavallini, California Water Service Company, 1702 N. First St., San Jose 95112 <br /> Jay Mcllrath, JC & M Mcllrath, P.O. Box 326, Stockton 95201 <br /> Jeanne Homsey, Cardino ATC, 1117 Lone Palm Ave., Ste B, Modesto 95351 <br />