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7 41 -, _ill 3764 Gold Camp Drive Suite 200 Delta 7 J"L -7 All 11: 4 7 Rancho Cordova,CA 95670 ��. Environmental 916/638-2085 Consultants,Inc. FAX:916/638-8385 June 30, 1997 Dr.John M.Farr Farr Associates 102 Flood Court Folsom,California 95630 Subject:Revised Work Plan for On-site Assessment Holz Rubber Company,Inc. 1129 South Sacramento Street Lodi,California 95241 Delta Project No.D096-090 Dear Dr.Farr: Delta Environmental Consultants, Inc. (Delta), has been authorized by Holz Rubber Company, Inc. (Holz) and its parent company BBA U.S. Holdings, Inc. (BBA) to provide a revised work plan for on-site investigation at the Holz facility located at 1129 South Sacramento Street, in Lodi, California (Figure 1). The revised work plan is based on comments provided by Holz,BBA, and the Department of Toxic Substances Control (DTSC) Work Plan for Performing a Soil Gas Investigation dated March 26, 1997. Comments from Holz, BBA, and DTSC were also discussed at a meeting on May 2, and a site walk on June 4, 1997. During the May 2, 1997, meeting, BBA indicated the intent to install ground water monitoring wells in addition to performing a soil vapor investigation and the collection of discrete soil samples. The following revised work plan outlines the proposed scope of work. Site Description and Location The subject site is located at 1129 South Sacramento Street in Lodi, California. It is presented in United States Geological Survey Lodi South , California 7.5 minute topographic map (Figure 1). The site occupies a total of approximately 5.76 acres of land; 2.45 acres are located west of South Sacramento Street and 3.31 acres east of South Sacramento Street The site is situated between an industrial zoned and residential area in the southern portion of the City of Lodi. The site contains several buildings which comprise approximately 190,000 square feet of space. The buildings are used for manufacturing,production, material storage, and administration at Holz. The site is bordered to the east by the Southern Pacific Railroad,and to the west,south and north by residential areas. Project Background Information In February 1995, Holz contracted Delta to perform a Phase I Environmental Assessment of the referenced facility. This information was presented in Delta's Phase I Environmental Assessment Report dated March S, 1995. Four locations were outlined as potential areas of concern based on past usage and storage of petroleum hydrocarbons and solvents. The areas noted were a dip tank area and material storage enclosure outside of building 1; a submerged vault area between buildings 5 and 6; Providing a Competitive Edge