SITE INFORMATION AND CORRESPONDENCE

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WATERWORK CORP. A RESNA Company RESPIA Environmental Solutions Through Applied Science, Engineering & Construction 1710 Main Street Escalon, CA 95320 Phone: (209) 838-3507 Fax: (209) 838-3509 September 17, 1991 Ms. Eleanor Ratliff San Joaquin County Public Health Services Environmental Health Division Post Office Box 2009 Stockton, CA 95202 SEP 20 LNV1RONMENTAL HEALTH PERMIT/SERVICES Re: Site Code 1864, Quarterly Monitoring Report, Gardner Property, 26056 Thornton Road, Thornton, CA Dear Ms. Ratliff: This letter report is being submitted to summarize activities performed since March 31, 1991, at the above referenced site (Figure 1). In accordance with your written request for additional investigation, RESNA Industries/WaterWork Corp. (RESNA) has been corresponding with Ms. Peggy Southern of Thornton Operation Progress, Inc., to obtain authorization to install a groundwater monitoring well on the property owned by the organization. The location of a well on the property is necessary to provide a monitoring point directly downgradient of the contaminant source. We have recently obtained authorization from Thornton Operation Progress, Inc. to access their property for well installation. The letter of authorization was forwarded to your office, along with well permit applications, under separate cover. To further define the lateral extent of groundwater contamination beneath the site RESNA will install three additional monitoring wells as shown on Figure 2. The additional wells will be installed in accordance with our August 14, 1990 workplan arid our March 29, 1991 letter addendum to the workplan. We anticipate installation of the proposed monitoring wells should be completed by October 15, 1991. Subsequent to installation, the wells will be developed and sampled on a quarterly basis, as appropriate, along with the existing site wells. GPLR0917.WP