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k'q KLEINFELDER 1 EXECUTIVE SUMMARY On behalf of its client International Raw Materials, Ltd., (IRM) Herum Crabtree Brown (HCB) contacted Kleinfelder and requested a proposal for the purpose of conducting a limited soil and groundwater assessment at the Mel Rice Terminal located at the Port of Stockton for the purpose of establishing the baseline environmental conditions of the property(Plate 1). Six aboveground storage tanks (ASTs) are located on the subject site which Kleinfelder understands are used for the storage of UAN 32, a Urea ammonium nitrate solution used as a commercial fertilizer. Kleinfelder's proposal titled "Revised Proposal, Limited Soil and Groundwater Assessment, Mel Rice Terminal, Port of Stockton, Stockton, California" (File No 0200lProp.Env/ST04PI65) and dated April 19, 2004 was subsequently approved by HCB on April 21,2004. On May 4th 2004, eleven push probes PP-1 through PP-11 were advanced in the vicinity of the six ASTs at the subject site (See Plate 2). The eleven push probes were advanced to approximate total depths that ranged between 10 and 16 feet below ground surface (bgs). Groundwater was encountered between approximately 9 and 12 feet bgs. A summary of Kleinfelder's findings are summarized as follows: • Based on the soil and groundwater sampling results it appears that past operations related to the onsite ASTs have impacted both soil and groundwater with elevated levels of Total Kjeldahl Nitrogen(TKN), ammonia as N, and nitrate as N. • A nitrate and ammonia contaminant plume exists beneath the site (See Plate 3 and 4) which is oblong and irregular shaped, measuring approximately 480 by 400 feet (based on the estimated 100 ppm ammonia/nitrate as N isocontour lines). The vertical and lateral extent of the plume is un-known, although attenuation with lateral distance in each direction is apparent, based on the two isocontour maps developed. • It appears unlikely that domestic wells are located in the vicinity of the subject site for drinking water due to the industrial activities in the area. However Kleinfelder recommends a survey of potential wells in the area, to evaluate risk to potential wells or sensitive receptors in the area. Elevated nitrate levels in groundwater have documented detrimental effects to the health and welfare of the public. • Kleinfelder recommends that a copy of this report be submitted to the San Joaquin County Public Health Services Department Environmental Health Division (SJC/EHD) for their review and continent. For additional discussion of Kleinfelder's findings please refer to the "Discussion of Results" in Section 5 and the "Conclusions and Recommendations"in Section 6. This report, and the conclusions and recommendations presented in this Executive Summary, are subject to the "Limitations" presented in Chapter 7 of this report. Any other party (other than HCB, IRM or regulatory agencies having enforcement jurisdiction for this site) who would like to use this report shall notify Kleinfelder, Inc. of such intended use in writing. 43851.E01/ST05R158/DH:Iv Page 1 of 12 02005,Kleinfelder,Inc. February 9,2005