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v <br /> ATC <br /> A S S O C I A T E S I N C . <br /> Laboratory data sheets and chain-of-custody documentation are contained in Attachment 2. An <br /> isoconcentration map depicting the MTBE concentrations in on-site wells during the fourth <br /> quarter 2003 is shown on Figure 3. <br /> ADDITIONAL SITE ACTIVITIES <br /> In December 2003, ATC personnel repaired the damaged well lid on well MW6 and replaced the <br /> damaged well box on well MW7. This work was done at the request of SJCEHD in their <br /> correspondence dated November 14, 2003. <br /> CONCLUSIONS <br /> Concentrations from wells MW I through MWS generally remain consistent with the results from <br /> the previous sampling event. The direction of groundwater flow was consistent with the <br /> previous monitoring event. Groundwater elevations have increased since September 2003. <br /> RECOMMENDATIONS <br /> Based on the results of the fourth quarter 2003 monitoring episode, we recommend the <br /> 4 following: <br /> • Conduct the first quarter 2004 groundwater monitoring and sampling of wells MW1 <br /> through MW8 and analyze samples for TPHg and BTEX by EPA method 8020 and <br /> MTBE, ETBE, DIPE, TBA, TAME, 1,2-DCA, and EDB by EPA method 8260. <br /> • ATC is preparing a site conceptual model for the site as requested by SJCEHD in their <br /> correspondence dated November 14, 2003. <br /> Please contact our office at(209) 579-2221 if you have any questions or comments. <br /> Respectfully submitted, <br /> ATC Associ tes Inc. <br /> Drew Van AllenY <br /> Senior Project Manager <br /> r•,� �9 <br /> J zmle Homsey, P.E. >~L}, '' ,••?�-�° P� <br /> CA Registered Civil Engineer No. 47410 . '� � �,, <br /> CC' Mr. John Johnson, The Customer Company <br /> I Mr.. Bob Matthews, More 4 Less <br /> Jim Barton, RWQCB <br /> saenviromenta1125847\00371reportsl4gr-2003.doe 4 <br />