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GETTLER-RYAN INC. April 28, 1999 Mr. Brett L. Hunter Chevron Products Company P.O. Box 6004 San Ramon, California 94583 Subject: Compliance Sampling Associated with Station Demolition at Chevron Service Station # 9-3232, 8660 Lower Sacramento Road, Stockton, California. Dear Mr. Hunter: At the request of Chevron Products Company (Chevron) Gettler-Ryan Inc. (GR) conducted a soil investigation following station demolition activities performed by Wendt & Sons Construction, Inc. (Wendt) of Lodi, California. Field activities consisted of demolition of all aboveground facilities and removing the underground storage tanks (USTs) and all associated piping. The scope of work performed by GR included: observing removal of the gasoline and waste oil USTs, and product lines; collecting soil and grab groundwater samples from the UST excavations, from beneath former product piping and dispensers, and from the soil stockpiles; submitting soil samples for analysis; evaluating soil disposal options and coordinating disposal; and preparing a report documenting the work. The work was performed to assess whether petroleum hydrocarbons have impacted the soil beneath the USTs and product lines. SITE DESCRIPTION The subject site is located on the southeast corner of the intersection of Sacramento Road and Ponce De Leon Avenue in Stockton, California (Figure 1). Former service station facilities consisted of a station building, two dispenser islands, three gasoline USTs, and one waste oil UST. All subsurface and aboveground facilities have been demolished and removed from the site. Three groundwater monitoring wells have been installed at the site. Pertinent site features are shown on Figure 2. The subject site is currently under new construction. FIELD WORK Sampling work associated with the site demolition activities was conducted by GR in accordance with the GR Field Methods and Procedures (attached) and GR's Contingency Work Plan dated January 21, 1999. All soil and water samples collected during this investigation were delivered under chain -of - custody to Sequoia Analytical Laboratory in Walnut Creek (ELAP #1271), California. Analytical methods and results are summarized in Tables 1 and 2. Copies of the laboratory analytical reports and chain -of -custody records are attached. Mr. Michael P. Kith and Mr. Harlin Knoll of the San Joaquin County Environmental Health Division (SJCEHD) were present at the site during UST and product piping removal and soil sampling activities. Mr. Ron Hiltscher of the City of Stockton Fire Department was also present during UST removal. 346463.03 6747 Sierra Court, Suite J • Dublin, California 94568 • ( 9 2 5 ) 551-7555