SITE INFORMATION AND CORRESPONDENCE

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Euuueu G. B..wN JN. 4 eovinNcq MPTTNEw OOOflIO11EL Water Boards PONM6NLnL Ggni6CilON Central Valley Regional Water Quality Control Board TO: Duncan A. Austin, P.E. Site Cleanup Program Manager FROM: Amy Terrell, P.E. Gerald Djuth, C.E.G DATE: 30 May 2014 SUBJECT: RATIONALE FOR CONSIDERING NO FURTHER ACTION ON STORMWATER POND PARCEL APN 145-090-48, KOPPEL STOCKTON TERMINAL, 2025 WEST HAZELTON AVE., STOCKTON, SAN JOAQUIN COUNTY Rationale: The October 2013 Request for No Further Action for Portions of the Koppel Stockton Terminal prepared by CH2M Hill recommends that the Central Valley Water Board grant no further action status to 3 of the 4 parcels that comprise the Koppel Stockton Terminal. Since 2000, all parcels have undergone phytoremediation to remove nitrate and ammonium from soil and groundwater. The 1.8 acre stormwater parcel (APN 145-090-48), shown in Figure 1, is the only parcel that meets the closure criteria at this time. The nitrogen concentration in soil is 98 mg/kg, which is below the cleanup goal of 200 mg/kg for nitrate-N plus ammonium. Nitrate is not detected in groundwater, and ammonium has declined to 1.4 mg/L, which is below the cleanup goal of 1.5 mg/L, as shown on Figure 2. The other two parcels recommended for no further action, however, do not yet meet the criteria for no further action due to elevated concentrations of nitrate and ammonium remaining in groundwater. While the soil on these two parcels is near the cleanup goal of 200 mg/kg nitrogen, groundwater beneath the parcels contains up to 300 mg/L nitrate as nitrogen and up to 20 mg/L ammonium. Issues: This 1.8 acre parcel is one parcel of several that comprise the 11.3 acre Koppel Stockton Terminal. This is the only parcel that is under consideration for no further action status at this time. The stormwater pond parcel is illustrated on attached Figure 1. Monitoring wells KP-4 and KP-4D have been destroyed, and monitoring well TG-5 will remain to evaluate remediation progress on the remaining parcels. Setting: The stormwater pond parcel is in the southeast portion of the Koppel Stockton Terminal, which is in an industrial area near the Port of Stockton. To the south and east, the site is bounded by active railroad lines, with industrial uses further to the south and west, by industrial uses to the north, and by residential uses to the northeast and east. Source: The source of the nitrate and ammonium pollution was historical operation of fertilizer handling and packaging facilities at the warehouse terminal and bagging plant. KARL E. LONOLEY SCD, P.E.,CIIAIR I PAMELA C. CREEOON P.E., BGEE,CBECUTIVC ORICCR 11020 Sun Center Drive#200.Renoho Cordova,CA 05670 I www.waterboartla.ca.gov/centrolvalley �)gECYGLIO PwPEn