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Thrifty #172 page 2 <br /> MTBE groundwater analysis on the chain of custody requested EPA method 8240 but <br /> was reported by the laboratory under EPA method 8020. Results were recorded as <br /> "less than" and PHS-EHD will require confirmation analyses for all positive MTBE <br /> results. <br /> It is recommended that EPA method 8020A (or 8021 B) be used to detect BTEX and <br /> MTBE compounds in LUFT groundwater samples. Due to a low occurrence of false <br /> positives, it is recommended that at least one groundwater sample per site which was <br /> positive for MTBE by EPA 8020A (or 8021 B) be analyzed by EPA 8240B (or 8260A) to <br /> verify the correct identification of MTBE. It is recommended that confirmation analysis <br /> be performed for the sample containing the highest MTBE concentration from the site <br /> based on method 8020A (or 8021 B) values. For these samples the 8240B (or 8260A) <br /> value should be reported. <br /> Prior to initiating a full remediative effort of soil vapor extraction, underground tank <br /> regulations require that a feasibility study that identifies and evaluates at least two (2) <br /> alternatives for restoring or protecting the beneficial uses of the groundwater be <br /> submitted to PHS-EHD for review and evaluation. Once the most effective and cost <br /> effective method is decided upon, PHS-EHD will grant approval for the remediative <br /> method to begin. As a note, vapor tests are not considered a full remediative effort but <br /> a report of the results of the testing should be submitted to PHS-EHD for evaluation. <br /> Please include in all quarterly reports conclusions and recommendations for the <br /> continuing or next phase(s) of investigation and/or remediation for the site. A schedule <br /> of the sampling events, vapor test, or any site activity that pertains to the mitigation of <br /> the contamination at the site should be included in all reports submitted to PHS-EHD. <br /> Please have your consultant or your office contact me for an appointment to sample the <br /> groundwater monitoring wells. Allow at least forty-eight (48) working hours for all <br /> appointments. <br /> You may contact Michael Infurna at (209) 468-3454 during normal working hours <br /> should you have any questions or wish to make an appointment. <br /> Donna Heran, REHS, Director <br /> Envir mental Health Division <br /> Michael Infurna Jr., enior REHS Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> MI/ <br />