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Mr aqua science <br /> R ur� I <br /> engineers <br /> its <br /> JAN o 8 2002 <br /> January 4, 2002 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Juan Robles <br /> 17886 South Airport Way <br /> Manteca, CA 95337 <br /> SUBJECT: WATER WELL SAMPLING RESULTS <br /> 17886 South Airport Way <br /> Manteca, CA 95337 <br /> Dear Mr. Robles: <br /> i <br /> On October 30, 2001, Aqua Science Engineers, Inc. (ASE) collected <br /> groundwater samples from the irrigation and domestic wells located on <br /> your property at 17886 South Airport Way in Manteca, California. The <br /> water samples were submitted to Kiff Analytical Laboratory in Davis, <br /> California for analysis. <br /> Groundwater samples collected from your irrigation well contained 0.59 <br /> parts per billion (Ppb) methyl tertiary butyl ether (MTBE). Groundwater <br /> samples collected from your domestic well contained 0.58 ppb MTBE. A <br /> confirmation sample was collected from the domestic well because this w a s <br /> the first time MTBE was detected in that well on your property. The I <br /> confirmation sample was collected on December 6, 2001 and again <br /> contained 0.58 ppb MTBE. The California Department of Health Services <br /> (DHS) has established a maximum contaminant level (MCL) for MTBE in <br /> drinking water of 5 ppb. The MTBE concentration detected in the <br /> groundwater samples collected from your well did not exceed the DHS MCL <br /> for drinking water. <br /> Even though the MTBE concentration detected in the water sample <br /> collected from your domestic well is below the DHS MCL for drinking <br /> water, ASE will be installing a water treatment system for your domestic <br /> well during the month of January. The water treatment system will <br /> eliminate any potential contact with MTBE. <br /> If you have any questions regarding the groundwater situation, please <br /> contact Ms. Lori Duncan of the San Joaquin County Public Health Services at <br /> (209) 468-0337. In addition, ASE would .like to continue to sample your <br /> 208 W. F1 Pinrodo, Danville, California 94,526 • 925-820-9391 • Fox 925-837-4853 <br />