SITE INFORMATION AND CORRESPONDENCE

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STATS OF CAUFORN;A �s GEORGE CEUKMEAAN, sever,rr ,, CFORNIA REGIONAL WATL,IBUALITY CONTROLBOA�� -� CPT TR AL VALLEY REGION �- y� fb1 43 ROU7,ER ROAD SACRAMENTO.CA 95827.3099 13 August 1947 AUG 14 19R7 ENVIROMENTAL HEALTH FERMIT/SERVICES Mr. Richard Keffer Pet Foods, Inc. 400 S. Fourth Street St. Louis, MO 63102 OGDEN FOODS UNDERGROUND TANK, STOCKTON, SAN JOAQUIN COUNTY The San Joaquin Local Health District has referred this site to our office due to its potential to adversely impact ground water quality. We have reviewed the report entitled "Ogden Food Products Corporation Soil and Ground Water Investigation, Stockton, California". In summary, a large amount of fuel oil has leaked from a concrete tank, and now exists below the water table. Results of water analyses for total petroleum hydrocarbons has shown varying levels of dissolved constituents in two monitoring wells. Based on our review of the report we feel that ground water quality is very likely to be degraded. To address the concerns of the Regional Board the following steps should be taken at this time: 1. A sample of the fuel oil , or soil soaked with fuel oil (as that found to contain 21,000 ppm fuel oil ) should be analyzed using EPA Methods 8240 and 8270 to identify constituents of concern. The most desirable sample would be a composite of samples taken from several highly contaminated areas under .or around the tank. 2. Water levels of the three monitoring wells should be measured and recorded on a monthly basis, so that water table gradient changes can be identified. This should begin immediately. With the information gained from the above analysis you should be able to identify the tasks necessary to characterize the full extent of water quality contamination or threat to water quality from fuel oil at this site. We will likely ask for additional characterization of site water quality based on the results of the 8240 and 8270 analyses of the fuel oil . If :eater analyses of those constituents in ground water comes up clean, a monitoring program may be necessary to prove there will net be a water quality problem in the future. If we can be assured that the site Doses no water quality threat, it will be referred back to the San Joaquin Local Health District and theState Department of Health Services for further action. The soil and fuel oii at this site may be characterized as a 'hazardous waste' since concentrations o' total petroleum hydrocarbons are exceeding 1,000 ppm.