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Quarterly Groundwater Monitoring Report for <br /> A. Teichert & Son, Inc. <br /> File No 3312-44 <br />• GENERAL INFORMATION <br /> 1 Site A Teichert&Son, Inc Mobile Equipment Sha <br /> 2 Street Address (see Figure 1) 103 North E Street <br /> City Stockton State CA Zip Code 95205 <br /> 3 Monitoring Quarter/Year Fourth Quarter 1994 <br /> 4 A Teichert&Son Contact George Takemori (916)-386-6916 <br /> 5 Consultant Contact Mark Thomas (916)786-8883 <br /> 6 Lead Agency Linda Turkatte,San Joaquin County Environmental Health Division <br /> 7 Secondary Agency <br /> BACKGROUND INFORMATION <br /> Under round storage tanks and um s were removed from the site in October 1986 and August 1988 <br /> Subsequent activities included excavatio contaminated soil from the tank area and conducting a groundwater <br /> investigation This investigation has included installing 14 groundwater monitoring wells(some of which have <br /> been removed or damaged,others have been dry for several- <br /> ears) After com letin pilot-scale tests <br /> a soil vapor extractions stem was designed and installed to remediate the remaining vadose zone contamination <br /> and groundwater contamination Installation was conducted in December 1994 <br /> GROUNDWATER MONITORING DATA <br /> 1 Monitoring Date December 19, 1994 <br /> 2 Field Measurements (see attached field data sheet) <br /> 3 Groundwater Flow Direction Southwester] (see Table 1 and Fs ure 2) <br /> 4 Hydraulic Gradient 0 0025 toot/toot <br /> 5 Comments Groundwater elevations rose approximately 3 feet in all the wells with measurable water <br /> The flow direction is consistent with the historical flow direction for this site <br /> GROUNDWATER ANAL=CAL RESULTS <br /> 1 Monitoring Frequency All wells monitored quarterly _ <br /> 2 Analytical Results Summarized in Table 2,certified analytical reports are attached <br /> 3 Comments No gasoline or benzene,toluene, ethylbenzene or xylenes(BTEX)were detected in the samples <br /> from wells MW-10 or MW-12 No BTEX was detected in the sample from MW-11, although 78 milligrams per liter <br /> of gasoline was detected in the sample from MW-11 These three wells can continue to serve as the detection <br /> monitoring wells to confirm the plume extent _ �! <br /> CONCLUSIONS/RECOMMENDATIONS <br /> Groundwater monitoring results were generally consistent with previously quarterlymonitoring results <br /> _Continued groundwater monitoring is recommended to demonstrate the effectiveness of the soil vapor extraction <br /> system recently installed(December 1994) on petroleum groundwater contamination This system is currently <br /> extracting vapors from MW-13 and MW-14 <br /> PREPAREDIREVIEWED BY <br /> Consultant ANDER N CgN +LT G ROUP <br /> Signature 1p'X, '� Date f f`�/9 <br /> Responsible Party A Teichert&Son,Inc <br /> Signature Date <br /> ANDERSON <br /> CONSULTING <br /> GROUP <br />