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Protect 113-13, Work Plan Page 2 <br /> I <br />{ SITE DESCRIPTION <br /> The project site is located on the southeast corner of the intersection of Jason and <br /> Main Streets in Manteca, California The site is currently used as a convenience <br /> store facility and retails gasoline under the name Cheapen #76 <br /> SITE BACKGROUND <br /> On March 5, 1987, Kleinfelder consultants reported that 3 monitor wells (MW-1 <br /> through MW-3) were installed on March 2, 1987, south, north and northwest, <br /> respectively, of the former underground storage tank location The wells were <br /> developed and sampled March 3, 1987 Groundwater was encountered at 13 feet <br /> below ground surface All groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPH-g) and benzene, toluene, ethyl benzene and xylenes <br /> (BTEX) All samples were non detect except for benzene, detected at 3 5 parts per <br /> billion (ppb) in MW-1 and 13 ppb in MW-3 <br /> On November 13, 1987, Memfelder requested to dispose of purge and sample water <br /> collected from the wells The purge and sample water collected April 28, 1987 were <br /> non detect. On June 21, 1988, Meinfelder report documented that groundwater <br /> samples collected May 27, 1988 were non detect The depth to groundwater was 20 <br /> feet below ground surface In a November 12, 1990 report, Dames and Moore <br /> documented that groundwater samples were collected on October 24, 1990 All <br /> samples were non detect Depth to groundwater was 25.3 feet below ground surface <br /> A fourth monitoring well was installed at the site on September 6, 1991 Soil <br /> samples analyzed from the boring were all non-detect for TPH-g and BTEX <br /> Groundwater samples obtained on September 11, 1991 from all four monitoring <br /> wells were also non-detect for TPH-g and BTEX Depth to groundwater was 28 to 29 <br /> feet below ground surface <br /> An aquifer pump test was done at the site October 15-16, 1991, and it showed that all <br /> four monitoring wells are in the same aquifer <br /> Parker Environmental Services, 4185 Rialto Court, Pittsburg, CA 94565-6116 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />