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Kennedy/Jenks Consultants 19 December 1994 Engineers and Scientists 3336 Bradshaw Road,Suite 140 Sacramento,California 95827 916-362-3251 FAX 916-362-9915 Ms. Christine M. Holm Agriculture Regulatory Unit California Regional Water Quality Control Board 3443 Routier Rd., Suite A Sacramento, CA 95827-3098 Subject: Groundwater Sampling Results - Fourth Quarter 1994 Cal-Farm Supply - Stockton Facility K/J 922540.00 Dear Ms. Holm: This letter transmits the results of the groundwater sampling event performed at the Cal-Farm Supply - Stockton Facility (Site) during the forth quarter of 1994. This sampling event was conducted in accordance with Kennedy/Jenks Consultants (Kennedy/Jenks') Groundwater Sampling Workplan transmitted to you and copied to Ms. Elizabeth Thayer of the Underground Storage Tank Unit of the Regional Water Quality Control Board on 26 October 1994 and our subsequent telephone conversations. FOURTH QUARTER 1994 GROUNDWATER SAMPLING EVENT On 1 November 1994, groundwater samples were collected from monitoring wells MW-1, MW- 2, MW-3, MW-4 and MW-5 by Kennedy/Jenks. Prior to sampling, groundwater elevations were measured and recorded for each monitoring well. The historical groundwater surface elevations as well as elevations during this sampling event are listed in Table i. The groundwater flow direction at the time of sampling is depicted in Figure 1 and appears to be in a northeasterly direction. The groundwater flow direction has shifted slightly from the northerly direction calculated during the 8 March 1994 sampling event. Following measurement of static water levels, all five monitoring wells were purged using a disposable bailer. Purging continued until the field measurements indicated pH, temperature and specific conductivity were stable. Groundwater samples were subsequently collected from all five monitoring wells using a disposable bailer. Groundwater Purge and Sample forms were completed in the field in order to document conditions at each monitoring well during sampling activities. Sampling equipment was decontaminated between well sampling events to prevent cross contamination between wells. The purge water and equipment decontamination water was stored in labeled DOT-approved 55-gallon drums located on Site. The groundwater samples along with Chain-of-Custody forms were transferred to Anlab, a California Department of Health Services certified laboratory located in.Sacramento, California. The Groundwater Purge and Sample and Chain-of-Custody forms are provided in Appendix A. The groundwater samples were analyzed for the presence of constituents of concern as requested by the Agricultural Regulatory Unit (ARU), of the Regional Water Quality Control Board and the Underground Storage Tank Unit (USTU). The analyses performed were as follows: