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290 ELWOOD DAVIS ROAD <br /> SUITE 312 <br /> LIVERPOOL,NY 13088 <br /> ENGINEERING-SCIENCE, INC. TEL:(315)451-9560 <br /> FAX:(315)451-9570 <br /> August 28, 1992 <br /> Mr. Michael J. Infurna <br /> Public Health Service <br /> San Joaquin County <br /> Environmental Health Services �t <br /> P.O. Box 2009 <br /> 444 N. San Joaquin Street SEP U 1 1992 <br /> Stockton, California 95201 <br /> Re: Greyhound Terminal <br /> EN IRON lSERVI HEALTH <br /> Location #8969 <br /> W, Stockton, California <br /> Dear Mr. Infurna: <br /> The purpose of this letter is to request that the San Joaquin County Department of Health <br /> Services (DHS) reconsider its decision to reject the June monitoring and sampling results <br /> previously submitted for the Greyhound terminal in Stockton, California. This request is <br /> ' based on the revised laboratory report included in this document (Appendix A). <br /> Also, in accordance with the recent notification by Laurie A. Cotulla (Program Manager - <br /> Environmental Health Division), Engineering Science (ES) has prepared this revised quarterly <br /> status report. The information presented is designed to address the specific format shown in <br /> "Appendix A" of the "Tri-Regional Board Staff Recommendations for Preliminary Evaluation <br /> and Investigation of Underground Tank Sites (August, 1991)". ES hopes that the information <br /> presented in this letter will be sufficient to complete Greyhound's June 1992 quarterly status <br /> report requirements for its Stockton, California terminal. <br /> The groundwater samples, which were collected at the Stockton facility during the week <br /> of June 29, 1992, were analyzed for TPH-D (DHS/LUFT method modified EPA method <br /> 8015/ solution preparation method 3510), and BTEX (EPA method 602). A site map showing <br /> the monitoring well locations is included as Figure 1. Initially, the method detection limits <br /> reported for the BTEX parameters were in excess of the limits established in the Leaking <br /> Underground Fuel Tank Field Manual (LUFT, 1989, Appendix A). As a result of this <br /> discrepancy, the analysis submitted for the second quarter groundwater monitoring event was <br /> found unacceptable. The laboratory has revised its original report, and the new method <br /> detection limits for the sampling event of June 29, 1992 are: benzene, 0.3 ug/L; <br /> ethylbenzene, 0.5 ug/L; toluene, 0.4 ug/L; total xylenes, 0.6 ug/L; and TPH-D, 0.05 mg/L. <br /> These detection limits are the lowest achievable with this laboratory's GC equipment. The <br /> detection limits established in the 1989 LUFT Manual (Appendix A, Table 3-5) are based on <br /> optimal conditions which can not readily be achieved by the analytical laboratory. Please note <br /> that the new reported detection limit for toluene is only 0.1 ppb over the recommended <br /> detection limit. All of the other detection limits from Table 3-5 have been met. We request <br /> that the Environmental Health Division reconsider its decision to reject these data, and find the <br /> results of this sampling event acceptable. <br /> A PARSONS COMPANY LML/SY132.21/0178 REV 1 <br /> u <br />