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. In addition to the 1,2 dichloropropane, methanol was also detected in the <br /> water sample at 140 ppb However, methanol is a common laboratory <br /> contaminant because it is used to clean sample vials and various <br /> laboratory equipment For this reason ASE will collect another sample to <br /> confirm the presence of methanol The USEPA integrated risk information <br /> system (IRIS) reference dose as a drinking water Ievel for methanol is <br /> 3,500 ppb <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 well on a periodic basis, and we will continue to provide y o u <br /> with analytical results of all future sampling events If you would like t o <br /> contact us, we can be reached at (925) 820-9391 <br /> Sincerely, <br /> AQUA SCIENCE ENGINEERS, INC <br /> �44111 Xn� <br /> Erik H. Paddleford <br /> Associate Geologist <br /> cc Ms Dot Lofstrom, San Joaquin County Public Health Services, <br /> Environmental Health Division, 304 E Weber Avenue, Third Floor, <br /> Stockton, CA 95202 <br /> Mr Marty Hartzell, Regional Water Quality Control Board, 3443 <br /> Routier Road, Suite A, Sacramento, CA 95827-3098 <br /> Mr Tony Gonsales, 2014 West Yosemite Avenue, Manteca, CA 95337 <br />