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r ` MEMORANDUM CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION 3443 Routier Road, Suite A Sacramento, CA 95827-3098 Phone: {916) 255 3000 CALNET: 8-494-3000 TO: GORDON L. BOGGS FROM: ELIZABETH A. THAYER UGT Program Coodinator Associate Engineer DATE: 17 November 1994 SIGNATURE:-21 � f SUBJECT: DIAMOND LUMBER, 120 EAST LOCKEFORD ST. (AKA 224 NORTH MAIN ST.), LODI, SAN JOAQUIN COUNTY In a letter, dated 1 July 1994, to the Board, San Joaquin County staff recommended that the Diamond Lumber site in Lodi be closed and requested our concurrence. I have reviewed the file for Diamond Lumber in Lodi. This site is located on the south side of East Lockeford Street between Stockton Street on the east and Main Street on the west. Railroad tracks run between East Lockeford and the site. In February 1985, a diesel tank (size not reported) and a 500 gallon gasoline tank were removed. The gasoline tank had a hole in the bottom, approximately 1'/2 by 1/4 inches, and was leaking product during tank removal. Soil was excavated to about 13 feet and disposed off site. Clean fill was placed in the excavation. Also in February 1985, a boring was drilled to a depth of 21 feet adjacent to the tank pit. Ground water was not encountered, but soil contamination at a depth of 15 feet was quantitated as 7 ppm benzene, A second boring was drilled through the tank pit to a depth of 20 feet. Odor was encountered in samples from 13 and 17 feet. However, no contamination was detected. In March 1985, a temporary well point was installed south of the pit. At a depth of 17 feet, 3 ppm xylene and 23 ppm benzene were detected and at 25 feet, 6 ppm benzene were detected in soil. A water sample collected from the temporary well did not contain detectable BTX, however, the detection limit was 20 ppb. In November 1991, three monitoring wells were installed. No BTEX was detected in soil from the borings. In ground water samples, 0.82 ppb toluene was detected in MW2 and 0.63 ppb was detected in MW3. Lead was detected in MW1, however, the laboratory was not certified to perform the lead analysis. No other contaminants were detected in ground water. In December 1991, the temporary monitoring well was destroyed. In April and September 1992, no ground water contamination was detected except for lead, which was detected in all three wells up to 260 ppb. In February 1993, MW2 had 0.3 ppb benzene and MW3 had 0.7 ppb ethylbenzene and 0.4 ppb xylene. Up to 122 ppb lead was also detected in ail three wells. In June 1993, BTEX and TPHg were not detected in any of the three wells. In only MW2, 18 ppb lead was detected in an unfiltered sample. In filtered samples, no lead was detected. In November 1993, BTEX and TPHg were not detected. Up to 80 ppb lead was detected in all three wells in unfiltered samples.