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North, Range 6 East, Mount Diablo Baseline and Meridian, Stockton West, Calif., 7.5-minute quadrangle) (4). The location of the site is shown in Figure 2-1. 2.2 Site Description Cal Cedar is located in an industrial/residential area of Stockton. The site is bounded by the McCormick and Baxter Creosoting Company (McCormick and Baxter) to the north, Interstate 5 (I-5) to the east and south, and Washington Elementary School and residences to the west and northwest. (5) McCormick and Baxter is listed on the EPA National Priorities List (NPL). Groundwater sampling from monitoring wells on the McCormick and Baxter site indicate the presence of hazardous substances related to the wood treating industry. The contaminant plume is migrating to the east and southeast. Therefore, contamination from the McCormick and Baxter site may cross the northeast section of the Cal Cedar site. (6) The 47-acre Cal Cedar site is entirely fenced and monitored with an electronic surveillance system. It is approximately 75 percent paved. The rest of the site is unpaved, and it is planned to be used for future lumber storage sheds. (5) According to a Cal Cedar representative, hazardous substances and wastes have been used and stored on paved areas within the site since 1921 (7). Currently on site are eight storage sheds, four slat warehouses, six kilns, a machine shop, a slat factory, a sawdust bag house, a sawdust bin and storage shed, three paved parking lots, four office areas, and a hazardous substance storage area. Hazardous substances are contained in 55-gallon drums. (5) The site layout is shown in Figure 2-2. 2.3 Operational History Since 1919, the site has been occupied by a cedar slat manufacturing company. The company was owned by W.B. Therman until 1927, when the Berolzheimer family purchased the Cal Cedar company and property. Before 1919, the site was used by a small milling company, and it is not known if hazardous substances were handled on site. (5) Cal Cedar manufactures cedar slats for pencils, and Duraflame fireplace logs. The production of the Duraflame fireplace logs began in 1968 (7). Cal Cedar uses solvents, lubricants, and various petroleum products in its processes (5). The cedar slat production begins with the cutting of 16-foot lengths of cedar into 7-inch blod These blocks are then cut into 0.25-inch slats. The slats are sorted, stained, and waxed. The W2 lumber from sorting is used in the Duraflame fireplace log production. A retort is use impregnate the slats with the stain and wax. The slats are then dried in a kiln for 7 day regulated temperature, pressure, and moisture content. After drying, the slats are sorted, paci and shipped off site. (5) The Duraflame fireplace log production uses the waste lumber that did not pass inspectir sorting from the cedar slat production. The waste lumber is ground into chips. SawduF milling of slats is mixed with the wood chips and then stockpiled. This mixture of s' PA California Cedar Products-W (F) • 5/93 4 Printed on 50% recy