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ENVIRt)y�TSS RVi�'�AI Tfr pip Kennedy,/Jenks Consultants 95EER -8 pH45 Engineers and Scientists 3336 Bradshaw Road,Suite 140 Sacramento,California 95827 916-362-3251 6 February 1995 FAX 916-362-9915 Wendy Wyels Agricultural Regulatory Unit California Regional Water Quality Control Board Central Valley Region 3443 Routier Rd., Suite A Sacramento, CA 95827-3098 SUBJECT: Re-Surveying Report Cal-Farm Supply Stockton Facility K/J 922540.00 Dear Ms. Wyels: Kennedy/Jenks Consultants is pleased to submit this re-surveying report in response to your letter dated 13 January 1995. In your letter, you requested a re-survey of the vertical elevations of the five groundwater monitoring wells located on the Cal-Farm Supply Stockton Facility (Facility) be performed. Additionally, you requested that the groundwater gradients at the Facility be re-calculated using the re-survey data for the groundwater sampling events dated 1 November and 8 March 1994 and 9 December and 30 August 1993. A copy of your request letter is enclosed with this report as Attachment A. The re-surveying was performed by Siegfried Engineering, Inc. (SEI), a licensed surveyor, on 25 January 1995. Others present at the Facility during the re-surveying included yourself and Rudy Schnagl of the Agricultural Regulatory Unit of the Regional Water Quality Control Board and Mike Godinho of Kennedy/Jenks Consultants. The stamped surveying notes and calculations prepared by SEI are enclosed as Attachment B. The new surveyed monitoring well elevations are listed in Table 1. Table 1 also contains the previous survey data for the wells located at the Facility and the differences between the previous and new surveyed elevations. Table 1 indicates that only minor differences exist between the two sets of surveyed elevation measurements. Using the new survey data, groundwater surface elevations at each monitoring well were calculated for the four sampling events indicated above. At the time re-surveying activities were conducted, depth to groundwater measurements were made to provide additional groundwater gradient and direction information. Table 2 contains the groundwater surface elevations for the four accessible monitoring wells during the four sampling events and at the time of the re-survey. Monitoring Well MW-5 is not included in Table 2 because it was not constructed at the time of the first survey and because it