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6ETTLER-RYAN INC. July 16, 1998 Mr. Brett Hunter Chevron Products Company P.O. Box 6004 San Ramon, California 94583 Subject: Contingency Work Plan For Excavation of Soil at Chevron Station #/9-5775, 301 West Kettleman Lane, Lodi, California. Mr. Hunter: At the request of Chevron Products Company (Chevron), Gettler-Ryan Inc. (GR) has prepared this Contingency Work Plan in anticipation of excavating soil to evaluate extent of hydrocarbon -impacted soil if detected in compliance samples following removal of the underground storage tanks (USTs) and associated piping at the subject site. It is our understanding that the subject site is scheduled to be demolished and associated facilities removed in early August 1998. The site is currently a Chevron Service Station, with a station building, two dispenser islands, and three gasoline USTs that share a common excavation near the western portion of the property. Pertinent site features are shown on Figure 2. According to Chevron records, there has not been any environmental investigations performed at this site. On July 1, 1998, GR checked the tank backfill wells to ascertain whether groundwater was present. Groundwater was not present in the two tank backfill wells which extend to a total depth of approximately 12 feet below surface grade (bsg). Therefore, we do not anticipate encountering groundwater during removal of the USTs and associated piping. SCOPE OF WORK GR proposes the following tasks: Task 1. Possible Excavation of Soil to Evaluate Hydrocarbon Impact if Detected Upon removal of the USTs and associated piping, compliance soil samples will be collected from native soil and submitted for analyses as directed by San Joaquin County Public Health Service Agency (SJCPHS). Should the analytical data indicate that the soil is substantially impacted by petroleum hydrocarbons, we propose to evaluate the extent of hydrocarbon impact by excavation. A backhoe will be utilized to explore outside and beneath the areas of hydrocarbon impact to evaluate the lateral and possible vertical extent of impact. The depth and number of samples collected will depend on the initial analytical results from the compliance soil samples collected beneath the former USTs and piping. The soil samples collected during exploration will be analyzed for the constituents detected in the compliance samples. Soil excavated to evaluate CH95775. WP 1 346408.02 6747 Sierra Court, Suite J 0 Dublin, California 94568 0 ( 5 1 0 ) 551-7555