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.I EMQRANDUM. CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION 3443 Routier Road,';Suite A Phone: .(916) 255-.3000 Sacramento, CA 95'827-3098 ; CALNET: 8-494-3000 TO: GORDON L. BOGGS � l r FROM: ELIZABETH A. THAYER{ ` UGT Program Coor inator Associate'Engineer '4 DATE: 20 January 1995 % " ; SIGNATURE: ? SUBJECT: DI OND Li�IMBER, 120 EAST LOCKEFORD ST. (AKA 224 NORTH MAIN ST), LODI, SAN fOAQUIN COUNTY_.'; . . +...� In a letter, dated 1 July 1994, to the Board, San Joaquin County staff recommended that the Diamond Lumber site in Lodi beclosed and-requested our concurrence.:. I have reviewed the file, y for Diamond Lumber in Lodi..: This site is located on the side of_EastLockeford'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 11/2 by 1/4 inches; and as stated in,.a San Joaquin County Health District Inspection Report; dated 14 February 1985, and a Kleinfelder akin duan removal: Soil was excavated to about report, dated 7 March 1985, the tank was le g g 13 feet and disposed off site.-Clean fill was placed in theexcavation. = ' Also in February 1985, a boring was drilled t6 a depth of 21 feet adjacent to,the.tank pita Ground water was not encountered. Benzene, toluene; andxylene were not detected, at detection limits of 1.0 ppm, in a soil sample collected at a depth of 15.feet.. Other peaks were quantitated as t 7 ppm using the benzene standard as reference.. A second boring was drilledthrough the tank pit to a depth of 20 feet. "Odor was detected" in samples from 13. and 17 feet. However, no contamination was detected in'the soil samples from 13, 17, and 19 feet. ` In March 1985 a temporary well point was installed south of the pit. At a depth of 17 feet,. , '' 3 ppm xylene`was detected we ban hilenzene d toluene were nat detected "at detection limits;of 1:0 ppm. Other peaks were quantitated as 23"ppm, using the benzene'standard. At 25 feet, a peak was quantitated as 6 ppm, using the benzene standard. BTX constituents were not detected"in a water sample collected from the temporary well, however, the detection limit was 20 ppb. In November 1991, three ground water monitoring wells were installed. No TPHg, BTEX, or lead were detected in soil samples from the borings. .In ground water samples, 0.82 ppb toluene was { detected in MW-2 and 0.63 ppb was detected in:MW-3. Lead:was detected in a ground water sample from MW-1, however, the laboratory was not certified.to perform the lead analysis. No TPHg or other petroleum hydrocarbon constituents were detected in the ground water samples. In December 1991, the temporary'monitoring well was destroyed. j 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, MW-2 had,0.3 .ppb benzene, at. . the detection limit of 0.3 ppb, and MW-3 had 0.7 ppb ethylbenzene and 0.4 ppb xylene. .Up to 122 ppb lead was also detected in all three wells.