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yam' THE INT L A B- ORATORIES -INC . ANALYTICAL CHEMISTRY • ENVIRONMENTAL SERVICES GEOTECHNICAL ENGINEERING • DRILLING SERVICES CONSTRUCTION INSPECTION & MATERIALS TESTING July 21, 1995 A681O1.02A City of Stockton Public Works Department 425 El Dorado Street Stockton, California 95202 Attn: Mr. John Fukumoto Subject: Interim Site Assessment Report and Work Plan Addendum Project: Van Buskirk Park Golf Course 1740 Houston Avenue Stockton, California Dear Mr. Fukumoto: The purpose of this letter is to provide an interim report on work conducted at the project i site and to request approval from the San Joaquin County Public Health Services (SJCPHS) ito perform additional soil assessment. 1.0 INTERIM SITE ASSESSMENT Consistent with the work plan (Twining, 1995), field work for subsurface assessment was conducted at the site on April 3 and 5, 1995. Drawing 1 shows a site location map. An excavation was constructed near the former location of a diesel underground storage tank (UST) and fuel dispensers. The former UST and dispenser locations are the suspected source of petroleum hydrocarbons (gasoline and diesel constituents) release based on findings from a UST removal action (Twining, 1995). Drawing 2 shows the approximate location and limits of the excavation. The excavation was dug both to explore the extent and to remove soil containing petroleum product constituents (PPCs). Soil samples collected from the bottom and the walls of the excavation were screened to assess the extent of the excavation during the field work. The field screening consisted of observation for staining, free fluids, or unusual odor, and head space analysis using a photoionization detector (PID). The work plan for the project (Twining, 1995) proposed an excavation 20 feet long, 10 feet wide and 16 feet deep. Excavation work proceeded until groundwater was encountered at approximately 11 feet BSG. At this time, the field screening with the PID of soil samples collected from above groundwater at 9 feet BSG indicated volatile organic compounds (VOCs) at concentrations of 72,000 parts per million (ppm) on the south end of the CORPORATE OFFICE: MODESTO VISALIA BAKERSFIELD 2527 Fresno Street 4230 Kiernan Ave.Suite 105 2521 E.Valley Oaks Drive 3701 Pegasus Drive,Suite 124 Fresno,CA 93721 Modesto,CA 95356 Visalia,CA 93292 Bakersfield,CA 93308 (209)268-7021 •Fax 268-7126 (209)545-1050 (209)625-1712 (805)393.5088 Chemistry Fax 268-0740 Fax 545-1147 Fax 625-1714 Fax 393-4643