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SUMMARY The Arcady Oil Company (Arcady) is a Class III nontoxic drilling-mud disposal site which operated from 1960 until 1985. The site, located approximately 6 miles west of Stockton in Molt, California, contains several diked lagoons and five unlined surface impoundments adjacent to Trapper Slough. Arcady violated waste discharge specifications at various times by discharging oil into the surface impoundment. San Joaquin County and the Regional water Quality Control Board (RwQCB) have taken several enforcement actions against Arcady, with which the company rarely complied. In March 1985 the California Department of Health Services (DOHS) added Arcady to the State Priority Ranking list. Water samples collected from Arcady's monitor wells, collected in 1983, contained 1,600-2,300 mg/l of chloride, 6,540-11,700 mg/l of Total Dissolved Solids (TDS), and .2-3 mg/1 of chromium, as well as contamination from vinyl chloride, 1,2-trans-dichloreethylene', and arsenic. Semple results obtained by DOGS confirmed the presence of heavy metals in both the groundwater and the disposal ponds. Arcady's activities appear to have contaminated the groundwater, as well as potentially contaminating the surface water due to a failure of the levee separating Trapper Slough and Arcady's mud-disposal site in 1918. In February 1986 Southern Pacific Pipeline Company (SP) experienced an oil leak in their pipeline which runs below Arcady's mud-disposal site, The RVQCB is treating the SP waste location as a separate site since the companies are in no way connected. However, DORS has grouped the oil leak and the disposal site together into on! file. Southern Pacific Pipeline has been doing cleanup work, but Arcady has been inactive for the last 2 years. The RVoCB is expecting a Solid Waste Assessment Test (SWAT) report from Arcady and a Remedial Investigation Vorkplan from SP to be completed in July 1986. Both will be prepared by the Mark Group Consulting Company, RVOCB and DORS will decide on further action from the information in these reports, The mud-disposal site is located in a groundwater recharge area, There are approximately 150 dwelling units within a 3-mile radius of the site, with no alternative to groundwater as a drinking water source. The surface water is used for irrigation, and also, according to the RwQCB, the site is located in the sensitive Delta environment in which many waterfowl live, Under the current HRS model, it is likely that the groundwater route score would be high because of the potential for a documented observed release to groundwater of highly toxic and persistent contaminants, the presence of a high water table, and no alternative water supply available. The surface water route score could also be high because of the levee failure allowing contaminants into Trapper Slough. Also, poor containment, high toxicity/persistence of the contaminants, and the close proximity to a sensitive environment add to the surface water route score. However, there does not appear to be potential for an air route score since there are less than 300 people within a 4-mile radius, and migration of any organic vapors cannot be monitored. Based on a t/aoc/para/lg