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Geokgizal Tecluucs l/W Page 7 <br /> Groundwater Monitoring Report <br /> Project No 770 2 <br /> November 19,2003 <br /> ' GTI makes the following recommendations <br /> • Maintain the current quarterly monitoring schedule <br /> • Continue monthly sounding measurements to see if the deep aquifer direction reversal <br /> noted in April and May repeats <br /> • Perform a pilot study of vapor extraction GTI submitted our September 17, 2003 <br /> "Pilot Test for Soil Vapor Extraction" work plan to perform a soil vapor extraction pilot <br /> test utilizing higher vacuum pressures (up to 26" Hg vacuum) than used with standard <br /> ' SVE This is similar to dual phase extraction technology but without the intent of <br /> extracting and treating groundwater The target of the test will be the clay/silt zone <br /> present in the vicinity of wells MW-4 and MW-7 at a depth of 50 — 60 feet bgs An <br /> 1 extraction well with a short five-foot screened interval will be installed to intercept the <br /> middle of this unit if this test proves successful, then this technology can be applied to <br /> treat other silt and clay units in the soil column Initiating this work will commence <br /> ' pending San Joaquin County approval <br /> 3.0 LIMITATIONS <br /> This report was prepared in accordance with the generally accepted standard of care and <br /> practice in effect at the time Services were rendered It should be recognized that <br /> definition and evaluation of environmental conditions is an inexact science and that the state <br /> ' or practice of environmental geology/hydrology is changing and evolving and that <br /> standards existing at the present time may change as knowledge increases and the state of <br /> the practice continues to improve Further, that differing subsurface soil characteristics <br /> can be experienced within a small distance and therefore cannot be known in an absolute <br /> sense All conclusions and recommendations are based on the available data and <br /> information. <br /> ' The tasks proposed and completed during this project were reviewed and approved by the <br /> local regulatory agency for compliance with the law No warranty, expressed or implied, is <br /> made <br />