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WORK PLAN ADDENDUM July 1996 Art & Artists 204 East Lodi Avenue Lodi, California I.O. INTRODUCTION In accordance with the request of Ms. Mary Lehr, Advanced GeoEnvironniental, Inc. (AGE) has prepared this Work Plan Addendum for the advancement of soil probings/borings at 204 East Lodi Avenue in Lodi, California (Figure 1 -Location Map). The scope of work includes the drilling of up to three soil probings/borings at the site utilizing direct push technology. The work plan addendum is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND In July 1994, a Final Remedial Plan (FRP) for the site was prepared by Geological Audit Services, Inc. (GAS). The FRP recommended installation of a soil vapor extraction/in-situ air sparging (SVE/IAS) system for hydrocarbon-impacted soil and ground water remediation. The FRP was approved by the PHS-EHD in August 1994, In July 1995, an SVE/IAS system was installed inside a fenced enclosure at the southeast corner of the Art & ,Artists building. The system began operation in August 1995. Remediation inonitoring recormnendations contained in the FRP included the biannual drilling of soil borings and collection of soil samples to evaluate progress of the SVE system. 3.0. SCOPE OF WORK 3.1. PROBING AND SAMPLING In accordance with a letter from the PHS-EHD, dated I I April 1996, three soil probings will be required to "verify the vapor extraction's effectiveness and to determine the extent of residual soil contamination, if any." Proposed probing locations are illustrated on Figure 2: one probing will be advanced within the former UST excavation; a second probing will be advanced southwest of the former UST excavation; and a third probing will be advanced northwest of the former UST excavation.