SITE INFORMATION AND CORRESPONDENCE

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I STATE OF t':ALIFORAIA - Environmental Protet Agency • PETE WILSON, Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION _ 3443 Routier Road, Suite A 4 Sacramento, CA 95827-3098 i PHONE: (916) 255-3000 FAX: (916) 255-3015 7 April 1995 t�% 1995 Mr. Rudolph Munzer ENVIRONMENTAL HEALTH Munco Company, Inc. r_RMIT/SERVICES 401 E. Ocean Blvd, Suite 501 Long Beach, CA 90802 KOPPEL STOCKTON TERMINAL: REQUEST FOR FURTHER INVESTIGATION Thank you for granting staff access to collect soil and water samples from Munco's Koppel Stockton Terminal on West Hazelton Avenue in Stockton. For your information, I have enclosed a memorandum describing the sampling process and the analytical results. Soils at the facility contained a wide range of total nitrogen concentrations (the sum of the nitrate-N and ammonia-N values). Soils on the western side of the warehouse appear to have been impacted by spills during loading and unloading activities; total nitrogen values of over 6,000 ppm were found in this area. However, the ditch on the eastern side of the warehouse appears fairly clean as only 107 ppm total nitrogen was detected. As noted in the memo, two samples were collected from material apparently spilling out of the warehouse doors. Total nitrogen concentrations for this material was also high, ranging from 5,700 ppm to 8,500 ppm total nitrogen. Due to the high groundwater elevation in the area (about 15 feet below ground surface), staff continue to feel that any total nitrogen concentration in soil over 200 ppm has the potential to impact groundwater. Soils on the western side of the warehouse contain highly elevated levels of nitrogen, and therefore, a complete site investigation will be required. Your 21 February letter states that Munco should not be responsible for completing the assessment and remediation because Munco's activities did not cause the nitrogen discharges. We are willing to consider naming the former owners and operators of the site, in addition to Munco, as responsible parties. In order to do this we ask that you supply the following: 1. The date which Munco acquired the property. 2. The activities for which Munco has used the property. 3. Any information you have regarding the names, addresses, and contact persons for the prior owners and operators. Please supply the above information by 25 April 1995. Staff will then request the known responsible parties to complete the site assessment. Pursuant to Water Code Section 13304, the parties will also be responsible for reimbursing the Board for the cost of staff oversight. I