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1� I� ADR Environmental Group, Inc. 225 3dh Street•Suite 202•Sacramento,CA 95816 (888)622-3734•(916)921-0600•FAX(916)648-6688 December 10, 2009 Harlin Knoll San Joaquin County Environmental Health Department 600 East Main Street Stockton, California 95202 Subject: Work Plan to Perform Subsurface Investigation Sutter Orchard 17345 East State Route 88 San Joaquin County, California Dear Mr. Knoll: ADR Environmental Group, Inc. (ADR) is pleased to present this work plan to perform a subsurface investigation at Sutter Orchard located at 17345 East State Route 88 in San Joaquin County, California (subject Property; Figure 1). Sutter Orchard is located on the north side of East State Route 88 in a rural agricultural area of unincorporated San Joaquin County, near the town of Clements. The tasks describe in this Work Plan include the collection of subsurface soil samples for laboratory analysis at selected locations in the vicinity of three former underground storage tank (UST) excavation. Background In October 2009, AEI Environmental & Engineering Services (AEI) performed a Phase I Environmental Site Assessment (ESA) for two non-contiguous parcels of land located in an unincorporated area of San Joaquin County, of which Sutter Orchards was a part. From a review of available historical information, it was determined that Sutter Orchards was utilized for agricultural purposes dating back to at least 1957. The southeastern portion of the Sutter Orchard parcel was developed with a single-family residence and two agricultural/barn buildings from at least 1957 through the mid-1970s. Circa 1978, the current single-family residence and walnut processing/shop buildings were constructed. From a review of available historical information, it was determined that Sutter Orchard formerly contained three USTs, including a 1,000-gasoline tank, a 1,000-gallon diesel tank, and a 1,000-gallon kerosene tank. Two of the USTs (gasoline and diesel) were located outside the southwest corner of the walnut processing building and that one of the USTs (kerosene) was located within the northeast corner of the footprint of the walnut processing building. The USTs were removed from the subject Property in September 2007. Do to the "AG exempt" status of the USTs, no soil sampling was performed during the removal of the tanks. Based on the lack of tank removal verification soil sampling, AEI recommended a subsurface investigation in the vicinity of the three former USTs to determine whether the subject Property has been impacted by a release form the former tanks.