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V Environmental Assessment Report Advanced Environmental Concepts, Inc. 1.0 INTRODUCTION This report presents the results of an investigation conducted by Advanced Environmental Concepts,Inc. (AEC)to evaluate the potential for soil and groundwater contamination resulting from the daily operation of two gasoline and one diesel underground storage tank(s) (previously removed in approximately 1992), and in the areas surrounding an aboveground weed oil storage tank, an agricultural chemical storage building, and a drainage sump. The site is located at 700 West Linne Road, approximately 6 miles southeast of Tracy, California. Site location is shown on Figure 1. The soil and groundwater sampling was performed on January 9, 1997 and March 11, 1997 in general accordance with the work pian previously designed and submitted by AEC and approved by the San Joaquin County Public Health Services-Environmental Health Division (SJCPHS-EHD). This investigation was authorized by Mr.Frank Oberti,Prudential Agricultural Investments and conducted under the supervision of Mr: Mike Inferna, Hazardous Materials Specialists, SJCPHS-EHD. V Contained in this report is background information regarding existing site characteristics, regional and local hydrogeological profiles,and the project history. Also included in the following sections are the objectives and scope of investigation, detailed investigative procedures, and subsequent findings. Finally,AEC provides an `r evaluation of said findings and makes related conclusions and recommendations. The report appendices contain project maps and figures(Appendix A),soil boring logs(Appendix B), and laboratory reports/chain-of- custody documents(Appendix C). 6W 2.0 BACKGROUND V At the request of Prudential Agricultural Investments,AEC performed a Preliminary Site Assessment(PSA) on a 729 acre agricultural parcel located approximately 6 miles southeast of Tracy, California during August and September, 1996. The subject property, identified as Paulson Farms and located at 700 West Unne Road, was owned by Mr.Robert Bogetti and Sons and is now owned by Prudential Agricultural Investments. The 1996 PSA was performed in order to identify existing environmental concerns at the subject site prior to finalizing foreclosure proceedings. Based on the results of the PSA, two former underground storage tank (UST) emplacements possibly containing three UST's were identified in the compound area south of the residence in the central portion of the 60 property. The USTs,thought to formerly contain gasoline and diesel, had been excavated and removed during July, 1992. No UST removal permitting,regulatory oversight,and/or soil sampling requirements of San Joaquin County were undertaken during the 1992 excavation and removal procedures. Subsequent to the UST removals,San Joaquin County Public Health Service-Environmental Health Division (SJCPHS-EHD) notified 60 the UST owners (Mr. Robert Bogetfi and Sons) that a written closure plan must be submitted for County approval. No record of compliance with this requirement or indication of additional site investigations were identified within SJCPHS-EHD records pertaining to this property. v 3.0 SITE CHARACTERISTICS The following sections summarize the project site features and conditions along with regional and local geological and hydrological characteristics. V Yr Project: AEC 96C-1703 1 • ENVIRONMENTAL CONCEPTS WITH DESIGN IN MIND• 1.r 4400 ASHE ROAD.#206 BAKERSFIELD.CA 93313 8051831-1646 • FAX B051831-1771