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orC <br /> A S S O C I A T E S I N C <br /> RECOMMENDATIONS <br /> Based on the results of the first quarter 2000 monitoring episode, we recommend the following <br /> • Perform second quarter 2000 monitoring event and analyze samples from the monitoring <br /> wells for TPHg, TPHd, and BTEX In addition, the groundwater samples should be analyzed <br /> for the following geochemical parameters to ensure biodegradation is occurring dissolved <br /> oxygen, carbon dioxide, sulfate, alkalinity, ferrous iron, nitrate, and oxidation reduction <br /> potential <br /> • Once four quarters of monitoring at the site indicate that natural biodegradation is occurring, <br /> ATC will recommend site closure from the appropriate regulatory agencies <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> fl FEZ% <br /> Drew Van Allen {� <br /> )JA E <br /> Project Manager H'4 MISEY <br /> Of ND, X047410 , <br /> * Exp <br /> Jeanne Homsey, `p�,Q� CIVIL <br /> CA Registered Civil Engineer No 47410 � �� ir, <br /> cc Mr Leo Zuber, Superintendent, Ripon Unified School District <br /> Marty Hartzell, RWQCB <br />• <br /> w 1130991quartly\Igr-2000 doc 4 <br />