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i s aqua science AEL engineers ince F 02 January 30, 2001 Mr and Mrs Rossi 495 Airport Way Manteca, CA 95337 SUBJECT WATER WELL SAMPLING RESULTS 511 Airport Way Manteca, CA 95337 Dear Mr and Mrs Rossi On December 19, 2000, Aqua Science Engineers, Inc (ASE) collected groundwater samples from the domestic well located on your property at 511 Airport Way in Manteca, California The samples were submitted to Kiff Analytical Laboratoi y in Davis, California for analysis No samples • were collected from the well located at 495 Airport Way since a n alternative water supply is providing water to that property Water Sample,, from both 495 and 511 Airport Way will be collected next quarter Groundwater samples collected from your 511 Airport Way well contained 160 parts per billion (ppb) methanol, which is a commonly used alcohol Due to this detection, a confirmation sample was collected from the well on January 22, 2001 The confiimation sample was also submitted to Kiff Analytical for analysis No methanol was detected in the confirmation sample Based on the relatively low methanol concentration in the original sample, and the fact that no methanol was detected in t h e confirmation sample, the original detection of methanol does not appear to be a significant concern at the site No other compounds wei e detected in the groundwater samples collected ASE personnel who sampled this well noted that paints and other chemicals were stoied in the pump house for this well Since alcohols a r e very volatile compounds, it is possible that alcohol in the air related to the storage of these paints may have contaminated the original sample This would be especially likely if the pump house had not been opened for a significant period of time, allowing vapors to accumulate in the air ASE recommends that paints and other chemicals not be stored in your pump 208 W El Pintado Danville Califom+a 94.526 • 925 8209391 • Fox 925 8374853