SITE INFORMATION AND CORRESPONDENCE FILE 1

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Mike Infurna [EH] From: Clint Harms [charms@secor.com] Sent: Monday, July 28, 2003 4:47 PM To: Mike Infurna [EH] Cc: Ed Ralston Subject: Tosco 1205, Lathrop Mike: The following is an update of our progress of permitting and offsite well access/sampling at Tosco 1205 in Lathrop. Once the new monitoring well is installed, we will be placing transducers in a few monitoring wells at the site to see if pumping from the closest offsite well is affecting plume migration. Permitting: Received City of Lathrop Encroachment permit on July 21, 2003. Submitted SJC EHD permit on July 23, 2003. Drilling will be scheduled after the permit is approved and inspection availability and availability of the drillers is determined. Access to Irrigation well at Lathrop Elementary School (15851 South Fifth Street) : Contacted Mr. Scott Anderson with Manteca Unified School District - Seemed very willing to give us access to sample well. Access Request submitted to ConocoPhillips on 7/25/03. Mr. Anderson indicated that the well did not have a screen interval (open bottom) because it was irrigation well (based on original well search the well is 248 feet deep) . The only wells that are screened in his school district are ones that provide drinking water. Mr. Anderson referred SECOR to Mormon Water Services, who he believed did the maintenance of that well. Mormon Water Services was contacted, and they had no recollection as that well being one that they service. Well Information: Mr. Anderson referred SECOR to Mr. Jerry Brown, maintenance supervisor for the school. He stated that the well was operational for irrigation of the lawns at the school, and that the well serviced 21 stations that each ran for .5 hours a day (10.5 hours total pumping per day for the well) and six days a week during the summer months (the well is not used during the winter) . Mr. Brown also stated that he thought the well pumping rate was 230 gallons/minute. Mr. Brown referred SECOR to N & S who he believed serviced the well (although they had not been out there for 3 to 4 years) . SECOR called N&S Irrigation and spoke with Mr. Bob Pauly. He could not locate anything under that address or Manteca Unified School District well in Lathrop. He said that he would contact his manager and that he would call me back. Give me a call if you have any questions. I will continue to send period updates on our progress at this site. Thanks. Clinton E. Harms Project Scientist SECOR International charms@secor.com (916) 861-0400 ph. (916)861-0430 fax 1