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r • 0 <br /> ACTON • <br /> MICKELSON • <br /> ENVIRONMENTAL, INC. <br /> Consulting Scientists,Engineers, and Geologists <br /> October 8, 2004 <br /> West Side Irrigation District VIA OVERNIGHT MAIL <br /> 1320 Tracy Blvd. <br /> Tracy, California 95378 <br /> Attention: Ms. Barbara Kleinert, Secretary/Treasurer <br /> City of Tracy <br /> Department of Development and Engineering Services <br /> 520 Tracy Blvd. <br /> Tracy, California 95676 <br /> Attention: Mr. Kuldeep Sharma, City Engineer 16014.01 <br /> Subject: Stormwater Basin Condition <br /> 75 West Valpico Road, Tracy, California. <br /> Dear Ms. Kleinert and Mr. Sharma: <br /> Acton • Mickelson• Environmental, Inc. (AME) conducts semi-annual ground water monitoring <br /> on behalf of Georgia Pacific Corporation (Georgia Pacific) in the vicinity of the former Georgia <br /> Pacific packaging facility located at 75 West Valpico Road, Tracy, California. During sampling <br /> conducted on September 29, 2004 AME personnel noted that the north side of the stormwater <br /> basin north of the facility had suffered a landslide and severe erosion. Photographs taken at that <br /> time and a photograph location figure are enclosed. Continued erosion during the upcoming wet <br /> season may further compromise the embankment and the canal. Georgia Pacific requested that <br /> both the city and the irrigation district be notified of our recent observations to alert you to the <br /> stormwater basin condition and the possibility for farther damage to occur in the future. <br /> Additionally, during a site visit in the third quarter of 2003, AME geologist Dennis Jones noted <br /> that wells were being installed within the city's enclosure adjacent to the stormwater basin. <br /> Drilling mud and debris were noted within the enclosure area. At that time he <br /> observed equipment associated with mud rotary drilling parked on the canal road. On January <br /> 20, 2004 while performing semi-annual monitoring he observed that the drilling by the city had <br /> been completed and well box construction was in progress. It is likely that the city's driller was <br /> using mud to drill and install the wells. It appears that material associated with the mud rotary <br /> drilling process was washed out and disposed into the stormwater basin in the location of the <br /> severe erosion. Please call Ms Julie B. Raming, P.G., Georgia Pacific at 404-652-6869 or me at <br /> 916-939-7550 if you have additional questions. <br /> C:\WP\2004 Letters\04-194.doc <br /> 5175 Hillsdale Circle,Suite 100 (916)939-7550 <br /> El Dorado Hills,California 95762 Fax(916)939-7570 <br />