SITE INFORMATION AND CORRESPONDENCE

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t MEM0RANDUNY CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION 3443 Routier Road,Suite A Phone: (916)361-5600 Sacramento,California 95827-3098 CALNET: 8-495-5600 TO: Gordon L. Boggs, Elizabeth A. Thayer FROM: Heidi Barr Underground Tank Unit DATE: 29 December 1994 SIGNATURE: SUBJECT: CORRECTION OF MEMO DATED 7 SEPTEMBER 1994,MARVEL MARKET, 429 LOCKEFORD STREET WEST, LODI, SAN JOAQUIN COUNTY Staff review of our file shows that on 22 May 1987 a 500 gallon unleaded gasoline tank and a 250 gallon regular gasoline tank were removed from this site. Sandy soils and petroleum odors were observed. On 10 June 1987, soil samples taken at 11 feet below ground surface detected up to 540 mg/kg of TPH (gas). On 13 December 1990, about 200 cubic yards of soil were excavated to 15 feet. Soil samples were collected but the reports did not specify where the samples were collected. TPH (gas) was detected at a concentration of 230 mg/kg, Toluene at 9.6 mg/kg, Ethylbenzene at 62 mg/kg, and Xylene at 865 mg/kg. In May 1991 one soil boring was converted to a ground water monitoring well. A soil sample from the boring for the well had up to 5100 mg/kg TPH(gas) as well as, Benzene, Toluene,Xylene, and Lead. Ground water samples collected in May 1991 revealed TPH (gas) up to 1000 µg/1, Benzene at 8 gg/1, Toluene at 680 gg/1, Xylene at 130 gg/1, Ethylbenzene at 26 gg/l, and EDB at 7µg/1. Lead was non detectable. During the last six ground water sampling events (February 1992 to June 1993) BTEX was below the detection limit (.3 to .9 ppm) except for a .6 ppm detection of Toluene in May 1992 and a detection of Xylenes at less than 1 ppb in February,August and November of 1992. TPH (gas) has been below the detection limit (10 to 50 ppb) during the last five sampling events (May 1992 to June 1993). In January 1993 two additional monitoring wells were installed in the down gradient direction. Ground water samples from both wells in March and June 1993 were below detection limits for all constituents. A soil vapor extraction system,operated from April of 1992 until January 1993, removed approximately 1,070 pounds of gasoline. On 5 April 1993 the San Joaquin Valley Unified Air Pollution Control District indicated that all air related remediation actions at the site had been discontinued and equipment had been removed. Three borings were drilled in August 1993, and were reported to contain no detectable concentrations of TPH (gas) or BTEX.