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0NA4,0v t SERv1C�5 January 5, 1994 Project 113-13 Mr. John Johnson The Customer Company P O. Box 886 Benicia, CA 94510 Subject Groundwater Sampling Report, Fourth Quarter, for Cheaper! #76, 890 North Main Street, Manteca, California Dear Mr. Johnson: This report describes the field methods used to obtain groundwater samples and the laboratory analysis results for the samples from the subject site. I. SITE HISTORY Two underground gasoline storage tanks were removed from the subject property an February, 1987 Soil samples collected during the tank removal showed detectable amounts of TPH-g and BTEX. On March 5, 1987, Kleinfelder consultants reported that three monitoring wells (MW-1 through MW-3) were installed on March 2, 1987, south, north and northwest, respectively, of the former underground storage tank location. The wells were developed and sampled March 3, 1987. Groundwater was encountered at 13 feet below ground surface. All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPH-g) and benzene, toluene, ethyl benzene and xylenes (BTEX). All samples were non detect except for benzene, detected at 3.5 parts per billion (ppb) an MW-1 and 13 ppb in MW-3. On November 13, 1987, Kleanfelder requested to dispose of purge and sample water collected from the wells. The purge and sample water collected April 28, 1987 were non detect. On June 21, 1988, a IGeinfelder report documented that groundwater samples collected May 27, 1988 were non detect. The depth to groundwater was 20 feet below ground surface. In a November 12, 1990 report, Dames and Moore documented that groundwater samples were collected on October 24, 1990. All samples were non detect Depth to groundwater was 25 3 feet below ground surface. Recycled Paper 190 East 7th Street 0 Pittsburg, CA 94565-2317 • FAX (510) 439-2566 0 Phone (510) 439-1024