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• A S S O C I A T E S I N C <br /> average hydraulic gradient on September 24, 2001 was calculated to be 0 001 or approximately 5 <br /> ft/mile <br /> A summary of groundwater monitoring data is presented in Table 1 <br /> RECOMENDATIONS <br /> Based on third Quarter 2001 sampling results ATC recommends conducting fourth quarter <br /> monitoring all groundwater wells in December 2001 <br /> Additionally, ATC recommends a revision to our previously submitted workplan for performing <br /> a pilot pumping test at the site ATC is unable to locate a pump capable of extracting <br /> groundwater at a flow rate of 10 gallons per minute (the anticipated maximum sustainable flow <br /> rate) from well MW4 because of the small diameter of the well ATC recommends extracting <br /> groundwater from well MW4 at a lower flow rate of 6 gallons per minute This may not provide <br /> accurate data on the radius of influence or aquifer characteristics, but the results will provide a <br /> removal rate for petroleum hydrocarbons in groundwater <br /> If you have any questions or require additional information, please contact our office at (209) <br /> . 579-2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> Jo Sellman <br /> Staff Geologist <br /> Je nne Y,Homse P E <br /> CA Registered Civil Engineer No C 47410 <br /> wo"A s` y <br /> �f f <br /> w <br /> w 1Wordpro1625821Quart1y13QR-2001 doc 5 <br />