SITE INFORMATION AND CORRESPONDENCE

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Working To Restore Nature 1710 Main Street Escalon, CA 95320 Phone: (209) 838-3507 FAX: (209) 838-3509 August 31, 1994 Ms. Mary Meays San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, CA 95201 Subject: McAllister Trust, 601 S. Ventura Street, Stockton, California Ms. Meays: This letter is submitted at the request of McAllister Trust in response to correspondence from San Joaquin County Public Health Services, Environ ental Health Division (PHSIEHD) dated July 27, 1994. Destruction of Monitoring Well MW-1 During soil excavation activities performed in November 1993, monitoring well MW-1 was destroyed due to caving of unstable sidewalls into the excavation. The upper 7-10 of the well had been broken off into the excavation pit. Subseq ent shifting of soil within the excavation pit effectively removed the remaining well casing above approximately 18 feet below grade. Our files indicate that your office was notified prior o scheduling the pumping and disposal of accumulated groundwater in the excavation pit. We apologize for any miscommunication. On April 28, 1994, 54,076 gallons of groundwater were pumped from the excavation pit and transported to the City of Stockton Wastewater Treatment Plant for disposal. After the level of groundwater within the pit had been signifi tly lowered due to pumping, visual identification of damaged monitoring well MW-1 could not be made by RESNA's Senior Technician, Steve Jacques. The lack of visual evidence was confirmed by RESNA technician Anthony Scoma, who was also on site, and by myself during a site inspection that afternoon. I can assure you that no portion of the remaining well casing was visible. It stands to reason that the well was still not visible on May 3, 1994 when a water sample was collected from groundwater within the excavation pit after the water level within the pit had risen in response to groundwater recharge. 150059\L-082294.FNL �"