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s WORK PLAN ADDENDUM Mayers Property 126 South Main Street Lodi, California 26 May 1995 1.0. INTRODUCTION In accordance with a request from Mr. Dick ?Mayers, Advanced GeoEnvironmental, Inc. (AGE) has prepared this fork Plan Addendum to drill one soil boring west of the former underground storage tank area at 126 South Main Street in Lodi, California (tile site). Tire location of the site is illustrated in Figure 1. A plan of the site is.illustrated in Figure 2. 2.0. BACKGROUND The site is located in a mixed usage area of central Lodi, California, oii the northwest corner Of South Main Street and" Walnut Street (Figure 1). One single story brick building is currently located on-site. The site was formerly the location of an automotive and marine repair facility (Stock's Automotive). Ho��ever, the site is c�u-rently used as a steel fabricatiorH facility. In October 1991, a gasoline dispensing island was discovered at the site. On-site investigation and discussions with previous owners revealed the presence .of a 500 gallon gasoline UST that had been installed.approxirnHately 50 years ago. On January 24, 1992, two soil borings were installed,irext to the UST: the borings were drilled to depths of 30 feet. No hydrocarbon odors. were detected during drilling, and no petroleum hydrocarbons were detected in soil samples analyzed. On Nlarch 26, 1992, the UST was removed by Jim Thorpe Oil, Inc.. At the time of removal, tine excavation was expanded to 7 by 10 feet and to a depth of 6 feet. Approximately 278 gallons of unleaded regular gasoline were removed from the tank at this time. One sample was collected from two feet below the bottom of the excavation, and a second sample was collected from the west wall of the excavation, where soil staining was observed. Total petroleum hydrocarbons quantified as gasoline (TPH-g) were detected in the soil samples collected from beneath the UST and tine west side wall. Orn September 28, 1993, one soil boring was drilled at the site. The boring (boring B3) was drilled within the former UST excavation. Petroleum hydrocarbons were detected in a sample collected at a depth of 20 feet.' However, no petroleum ]Hydrocarbons were detected in samples collected frons`depths of 30 and 35 feet.