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®®uAM <br /> Working to Restore Nature <br /> total xylene isomers (BTEX) and total petroleum hydrocarbons as gasoline (TPHg) using <br /> Environmental Protection Agency Methods 5030/8020 and 5030/8015. The samples were <br /> analyzed at GTEL Environmental Laboratories, Inc. in Concord, California. The results of <br /> these analyses are summarized in Table 1. Copies of the laboratory analysis reports are <br /> Appendix A. <br /> Results of analyses indicated TPHg concentrations were detected in groundwater samples <br /> collected from wells MW-1 and MW-3 through MW-6 at concentrations ranging from 26 <br /> parts per billion (ppb) (well MW-4) to 4,800 ppb (well MW-5). Benzene concentrations <br /> ranged from below detected laboratory detection limits (well MW-2) to 640 ppb (well MW- <br /> 5). TPHg and BTEX were not detected in well MW-2. Concentrations of benzene and <br /> TPHg are shown on Plate 2. <br /> WORK IN PROGRESS <br /> ARCO will continue quarterly monitoring. <br /> CONCLUSIONS <br /> The groundwater flow direction has been consistently toward the east to southeast. <br /> Dissolved gasoline hydrocarbons were detected in groundwater samples collected from <br /> monitoring wells MW-1 and MW-3 through MW-6 but were not detected in well MW-2. <br /> DOCUMENT DISTRIBUTION <br /> Ms. Mary Meays <br /> San Joaquin Public Health Services <br /> P.O. Box 2009 <br /> Stockton, California <br /> 95201 <br /> Ms. Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Sacramento <br /> D California 95827-3098. <br /> D <br /> 0429=ar/-W&-11 3 <br /> r <br />