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aquascience <br /> AW <br /> ff -w_ I MOF - I engineers iinc. <br /> April 30, 2001 <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 /> On March 9, 2001, Aqua Science Engineers, Inc (ASE) collected <br /> groundwater samples from both the domestic and irrigation wells located <br /> on your property at 17886 South Airport Way in Manteca, California The <br /> samples were submitted to Kiff Analytical Laboratory in Davis, California <br /> for analysis <br /> Total petroleum hydrocarbons as gasoline (TPH-G) was detected at a <br /> concentration of 230 parts per billion (ppb) in the domestic well sample <br /> Methanol was detected in the sample collected from the irrigation well a t <br /> a concentration of 150 ppb However, methanol is a common laboratory <br /> contaminant because it is used to factory clean sample vials It also is <br /> commonly used in the analytical laboratory Residual methanol may have <br /> been present in the sample vials resulting in the methanol concentration <br /> TPH-G would not be expected in a water sample collected from a domestic <br /> well unless other compounds were also present For these reasons, ASE <br /> returned to collect confirmation samples from the wells on April 13 , <br /> 2001 During the confirmation sampling, the vials were rinsed with well <br /> water prior to collecting the samples <br /> The confirmation samples did not contain any detectable concentrations <br /> of any of the compounds analyzed <br /> If you have any questions regarding the groundwater situation, please <br /> contact Ms Dot Lofstrom of the San Joaquin County Public Health <br /> Services at (209) 468-3436 In addition, ASE would like to continue to <br /> . sample your wells on a periodic basis, and we will continue to provide you <br /> 208 W El Pintodo, Danville, Calhfornra 94526 • 925-8249391 + Fox 925-8374853 <br />