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02 September 1999 <br /> AGE-NC Project No. 98-0468 <br /> ' Page 3 of 4 <br /> ' 4.0. GROUND WATER ANALYTICAL RESULTS , <br /> Ground water samples were-collected from each of the site monitoring Nvells for laboratory <br /> ' analysis:A summary of ground water anah-tical results are presented in Table 2. The laboratory <br /> analytical.report is included in Appendix C. <br /> There were no reported detections of BTEX. TPH-d, or TPH-g in any of the ground Neater samples <br /> analyzed Table 2 . MTBE kas only reported in the ground \eater sample collected from monitoring <br /> , - ( ) ) p p <br /> NvellyNINV-4. MTBE wras detected in sample NIW-4 at 290 4g/l and 340',ug/1, by,laboratory analysis <br /> by EPA Method 8260•and EPA Method 8020. respectively (Table 2).7he reported detections of <br /> ..MTBE in sample MW-4 exceeds the.DHS-established secondary rnaxinium contaminant level <br /> (MCL) of 5.0 pg/1 and actioii level of 13 ug/l for MTBE in around water. There were no reported <br /> ' detections of any other'fuel ox}'genating compounds. The analytical results for the August 1999 <br /> monitoring event appear consistent with previous results. <br /> 5.0. RECOMMENDATIONS <br /> Based upon data reviewed and collected at the site. AGE recommends: <br /> Continuation of the quarterly. ground water monitoring procrarn. The next Qround %nater <br /> monitoring event will be.the third.quailer of the ground water monitoring program of 1999. <br /> It is recommended that the next quarterly ground water' monitoring event be conducted in <br /> N vember 1.999. y ; <br /> • Implementation of additional site assessment activities to further evaluate the vertical and', . <br /> ' lateral extent of petroleum hydrocarbon impact to soil and ground water related to the former <br /> USTs. It is recommended that the additional sire assessment activities- consist of ille <br /> advancement of up to five. soil probe borings for the collection and analysis of soil and <br /> ground ,,yatcr samples. The proposed soil probe boring locations are sho,,vn on Figure 2. It r. <br /> ' is proposed that one soil boring each be located,northeast of boring B-2 and southwest of <br /> boring B-.3 to evaluate the extent-6f TAH-d impacts.in ground water. Two soil probe borings <br /> ' are proposed at,locations north'of N,;-e11 1\4NN74 to assess the vertical, and lateral extent of <br /> N4TBE and TBA impact to ground water. Also, one soil boring is proposed in the vicinity of <br /> previous soil probe boring,SB-5 to delineate the verticalextent of petroleum hydrocarbon <br /> impacts in soil., <br /> ' 6.0. LIMITATIONS <br /> ,AGE's professional services,,were performed USitig that.degree of care and skill ordinarily exercised <br /> id+e_merlC.cuF:mireuuni'ntxL rite. <br />