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In 1987, the San Joaquin County Local Health District, Environmental Health Department began performing tank tests to monitor the integrity of the five underground storage tanks. No reports indicate leakage from these tanks. By 1990, the five tanks were excavated and removed from the site. Soil samples taken during the removal indicate the presence of benzene, toluene, xylene, and ethyl benzene. Thus, the California Cedar Products Company was placed on the low priority Contaminated Site List. There are plans to pursue remediation action at the site. A March 1989 inspection discovered a solid waste container (containing liquid waste with a high pH) that was discharging liquid into a storm drain. The California Cedar Products Company corrected this problem by moving the container. In May 1975, the City of Stockton, Municipal Utilities Department became involved with the site when a pump station at Orange and Sonora streets had a wax build-up that was attributed to the California Cedar Products Company site. Continuous wax build-up occurred at various locations within the sewer line. The California Cedar Products Company has resolved all incidences regarding the city sewer lines. In October 1978, the City of Stockton, Municipal Utilities Department issued a wastewater discharge permit for the California Cedar Products Company. In 1974, the San Joaquin Valley Unified Air Pollution Control District issued permits for various operations at the California Cedar Products Company site. Inspections of the site are conducted quarterly and there have been numerous notices of violations and corrections of these violations. The depth to groundwater beneath the site is 12 feet to 25 feet below ground surface. Geological materials between ground surface and groundwater are characterized as sands and clays. The nearest drinking water well is 1.25 miles east of the site. Three water companies within Stockton serve an approximately 225,000 people. A total of 45 municipal drinking water wells are within 4 miles of the site. The nearest surface water body is the Mormon Slough, approximately 0.20 mile to the north. The Mormon Slough and the Port of Stockton do not support any sensitive environments. However, people use the Mormon Slough and the San Joaquin River for recreational fishing. The California Department of Fish and Game reports that approximately 10,000 pounds of fish are caught annually within the 13.75-mile stretch of the San Joaquin River downstream from the Port of Stockton. No drinking water intakes are associated with the Mormon Slough, the Stockton Deep Water Channel, or the San Joaquin Delta within 15 miles downstream of the site. The 2-year, 24- hour rainfall event for the site area is approximately 1.6 inches to 1.8 inches. Surface water runoff runs into the city storm drain system. The length of drainage for surface water runoff from the site to the Mormon Slough is approximately 1 mile. The California Cedar Products Company is within a 500-year floodplain. No residences or daycare centers are within 200 feet of the site. A maximum of 760 people work on site at any given time. The site is entirely fenced and locked during non-working hours. Approximately 136,035 people live within 4 miles of the site. The pertinent Hazard Ranking System factors for the site are as follows: • The closest well is approximately 1.25 miles from the site. • The site is paved in and around the areas where hazardous substances are used and stored. PA California Cedar Products-W (F) • 5/93 11 Printed on 50% recycled paper.