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ATC Associates Inc <br /> +' <br /> (:VYAT4: <br /> l 1 17 Lone Palm Avenue, Suite B <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> fax 209-579-2225 <br /> A S SOC G ATE S INC <br /> GEOTRACKER DATA UPLOAD <br /> The facility has been assigned a Geotracker global identification number T0607700120 The depth to water <br /> and laboratory data associated with the fourth quarter 2005 sampling event were submitted electronically to <br /> the State Water Resources Control Board (SWRCB) Geotra+cker database (confirmation numbers <br /> 2429426431 and 2094456613, respectively) Documentation of the data submittal is contained in <br /> Attachment 3 <br /> CONCLUSIONS <br /> The laboratory analytical results of the groundwater samples collected from MW1 through MW8 in <br /> December 2005 are generally consistent with recent historical analytical results MTBE concentrations <br /> detected in the groundwater samples collected from MW 1, MW2, MW5, MW6, and MW8 decreased with <br /> respect to the last time these wells were sampled Petroleum hydrocarbon conceidrathons detected in the <br /> groundwater sample collected from MW4 increased with respect to the previous sampling evert The <br /> lateral extent of the groundwater plume appears to be adequately defined The direction of groundwater <br /> flow was fairly consistent with reseed to recent monitoring events The hydraulic gradient on December <br /> 21, 2005, was calculated to be 0 0026 ftift or approximately 13 7 ft1mde Groundwater elevations have <br /> increased since September 2005 <br /> • RECOMMENDATIONS <br /> Based on the results of the fourth quarter 2005 monitoring episode,we recommend the following <br /> o Conduct the first quarter 2006 groundwater monitoring and sampling of MW 1 and MW4 through <br /> MW8 and analyze samples for TPHg and BTEX by EPA Method 8015MI8021B and MTBE, <br /> ETBE,DIPS,TBA,TAME, 1,2-DCA,and EDB by EPA Method 8260B <br /> Prepare an Interim Remedial Action Plan to address the MTBE hot spot concentrations <br /> Please contact our office at(209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> �ao-'41 r �\pNAh CFD <br /> Stephanie Davi <br /> Staff Geologist a SWUM HAi�IER <br /> doe <br /> Todd Hafner,P G <br /> CA Professional Geologist#8090 9TF O� CA4�F <br /> cc Mr John Johnson,The Customer Company <br /> Mr Bob Matthews, More 4 Less <br /> Jun Barton, RWQCB <br /> s 1envwoncntd\25847M37keporis\4q-2005 dw 4 <br />