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1 <br /> 10 August 1999 <br /> . AGE-NC Project No 95-0105 <br /> Page 3 of 5 <br /> 1 4.0. WELL SURVEY <br /> A well survey was conducted to gather information regarding the location and use of municipal and <br /> 1 Y g g g <br /> domestic wells within 2,000 feet of the site The State of Califorrua Water Resources Control Board <br /> records were reviewed One City of Tracy well was located at 2,000 feet southwest of the site A well <br /> reported drilled in 1955 was located approximately 300 feet north of Grant Line Road between �p <br /> Parker Lane and Tracy Boulevard One additional well was registered in the search area(township <br /> 2 south, range 5 east, section 16) however, this well was listed incorrectly and is actually located <br /> northeast of Stockton Domestic wells were visually observed at 3065 Holly Drive and 189 West <br /> Grant Line Road The well construction specifications for these wells were available iPA��` <br /> A ground water monitoring well is located approximately 90 feet northwest of the site, at the Ci <br /> of Tracy - Fire Station No detectable concentrations of petroleum hydrocarbons were presenVin a <br /> ground water sample collected from the well in the first quarter of 1996 <br /> Copies of the available well logs are included in Appendix C Figure 3 depicts the water well <br /> locations <br /> Based on the current and past ground monitoring well network and the limits of the petroleum <br /> contamination down-gradient and cross-gradient at the site, it is not likely that these domestic wells <br /> in the search area will be impacted Additionally,based on the limits of the petroleum contamination <br /> up-gradient at the site, it is not likely that the municipal well in the search area will be impacted <br /> The municipal well has regular sampling and analytical tests for some of these compounds At the <br /> current time, this well has not been impacted Based on the construction requirements of drinking <br /> water wells, if is not likely that the wells will be impacted by the petroleum release on the site <br /> ' S.O. FINDINGS <br /> Ground water was inferred to be flowing toward the northwest and minor concentrations of <br /> petroleum hydrocarbons were detected in the ground water sample collected from well MW-3 <br /> 5 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> ' The elevation of ground water in each well was calculated by subtracting the ground water depth <br /> from the surveyed casing elevation(Table 1) The casing elevation of each well had been previously <br /> surveyed relative to a City of Tracy bench mark Ground water elevations at the site ranged from <br /> ' 22 03 to 22 27 feet above mean sea level The ground water flow direction in July 1999 was directed <br /> generally toward the northwest Figure 4 depicts the ground water elevation contours at the site <br /> Advanced Geo$mlrumental,Inc <br /> I <br /> 1 <br />