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Closure Summary Report CONTINENTAL GRAIN COMPANY 1805 Harbor Street, Stockton, California 1.0. INTRODUCTION In accordance with the request of Ms. Linda Huff, Advanced GeoEnvironmental, Inc. (AGE) has �.., prepared this Closure Summary Report (CSR) summarizing all field activities conducted at 1805 Harbor Street, Stockton, California (site). Based upon the results of the investigation and remediation of the former underground storage tank(UST)area at the site,AGE is requesting closure +- for the Continental Grain Company site. The site setting is illustrated on Figure 1; the former underground storage tank (UST) location, site building structures and existing monitoring well locations are depicted on Figure 2. This CSR has been prepared in accordance with the California Regional Water Quality Control Board(CRWQCB)-Central Valley Region guidelines(Tri-Regional Board Staff Recommendations #"` For Preliminary Investigations and Evaluation of Underground Tank Sites)for No Further Action Required Requests (Appendix A). 2.0. BACKGROUND The site is located in Stockton, California south of the Port of Stockton's Deep Water Channel (Figure 1), surrounded by industrial and residential areas. The site is an active grain storage and 6„, transportation facility currently occupied by the Penny-Newman Grain Company. t.. 2.1. REGIONAL GEOLOGICIHYDROGEOLOGIC SETTING According to Geologic Map of California, published in 1966 by the California Department of *- Conservation Division of Mines and Geology, the site area is within the Great Valley Syncline (GVS), a large, elongate, northwest trending structural trough. The GVS is subdivided into two major divisions designated the Sacramento and San Joaquin Valleys,which have been filled to the present elevation with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north.The western and eastern boundaries of this province are comprised " of the California Coast Range and the Sierra Nevada, respectively. The soil which comprises the western area of Stockton is within the Stockton Arc complex or the western lateral edge of the pliestocene pro-delta fan. The western region of Stockton was part of the lower delta plain, lying between the low tide mark and the upper limit of the tide influence. The lower delta plain is covered by water during high tide and exposed during low tide, subject to both fluvial and marine processes. The subsequent subaqueous delta plain lies seaward of the lower deltaic plain below the low tide water level. The subaqueous delta is characterized by open marine Advanced GeoEnvironmental,Inc. i✓