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• GROUNDWATER GRADIENT AND FLOW DIRECTION <br /> Figuie 4 shows the groundwater elevation gradient and flow dnection deteimined from <br /> depth to water measurements at the three on-site monitor wells oil June 8 2000 The <br /> 01oundwater elevation has increased by an aNerage of 1 39 feet at the three nlonitoi «ells <br /> since the previous quaiterl) monitoring round on February 23 1999 The flow direction <br /> is to the west-inoi thwest The overall gradient is 0 002 feet/linear foot <br /> RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES <br /> Che results of the certified analyses of gtoundwatei samples collected tiorn the three <br /> monitor wells on June 8 2000 are shomi in Table 1 Copies of the laboratory reports are <br /> included as Appendix C of this report <br /> TPH-G concentrations ranged from a innaxrmwin of 10000 ug/l at rnonitoi N\ells MW and <br /> MW2 to 4300 ug/l at monitor well MW3 <br /> Benzene concentrations ranged from a ma\rtnum of 3200 ug/l at MW1 to 660 uU/l at <br /> MW2 <br /> MTBE concentrations ranged frorn a maximum of 17 ug/l at MW2 to less than the <br /> laboratory detection limits of 2 5 ug/l at MW3 <br /> Fu,ure 5 shows the distribution of TPH-G, BTEX, and MTBE in gioundwatei and the <br /> estimated lateral Iimits of the TPH-G in groundwater as determined from yuround«ater <br /> samples collected on .lune 8, 2000 The increase in overall groundwater eleN ation since <br /> the previous quarteily monitoring round was accompanied by all increase in TPH-G, <br /> BTEX, and MTBE concentrations at the three monitor wells <br /> RECOMMENDATIONS <br /> 1) Implement September 28, 1999 woil pian to install additional Groundwater <br /> monitoring wells following approval or amendment by SJCEHD <br /> 2) Re-survey monitor well casing elevations at MW1, MW2, and MW') to insure proper <br /> deteimination of giouindwatei gradient and flow direction <br /> LIMITATIONS <br /> The discussion presented in this report is based on the following <br /> 1 The observations and data collected by field personnel <br /> 2 The results of laboratory analyses performed by a state certified analytical laboratory <br /> 3 Arc Pump QM 4-6 2000 <br />