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Subsurface Investigation, Well Installation, and Sample Analyses Results Page 4 <br /> Cintra Park Phase II Development, <br /> Tract 2705, Tracy, California <br /> July 23, 1998 CTE Job No. 20-0445B <br /> 2.3.3 Groundwater <br /> The site lies within Groundwater Sub-basin B3 of the San Joaquin River Basin (5B) hydrologic <br /> study area (CRWQCB, 1991). Groundwater resources within this hydrologic area have been <br /> designated as having beneficial uses for municipal and domestic supply, irrigation, stock watering, <br /> industrial process, and service supply. According to a groundwater map for the area (California <br /> Department of Water Resources, 1988), the depth to first groundwater is approximately 10 fbg. <br /> Information provided by Mr. Michael Infurna (personal discussion, 1997) suggested that the <br /> direction of groundwater flow was to the northeast. <br /> 3.0 SUMMARY OF PREVIOUS SITE ACTIVITIES <br /> 3.1 Under ound Storage Tank Removal Activities <br /> Two, steel, USTs (approximately 300- and 800-gallo6s capacity) were excavated and removed <br /> 1 . <br /> from the site on June 2, 1997, by Jim Thorpe Oil, Inc. These USTs were reportedly used to <br /> �- store leaded and unleaded gasoline from the late 1960s until approximately 1992. Details of <br /> removal activities were previously reported in CTE (1997). Two soil samples (TK1 and TK2) <br /> were collected, at depths of approximately eight and 8.5 fbg, from the open excavations below <br /> the former UST locations. Collected soil samples were analyzed at GeoAnalytical Laboratories, <br /> Inc. for: Total Petroleum Hydrocarbons-Gas and -Diesel (TPH-G and -D), benzene, toluene, <br /> �k <br /> CATEEL FILESICINTRA PARKICINTRA7-13.D0C <br />