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Ms. Carol Oz Project 20805-147.004 <br /> July 29, 1998 <br /> Page 2 <br /> The current extent of groundwater impacts is defined in the vicinity of MW-2 and MW-3. <br /> The detected petroleum hydrocarbons at MW-4 have shown increases in TPHG and <br /> methyl tett-butyl ether (MTBE) and decreases in BTEX since installation in the fourth <br /> quarter 1997. Additional monitoring is proposed to determine concentration trends. <br /> If you have any questions, please call (530) 676-6884. <br /> Sincerely, <br /> Pinnacle �-.._ -_ � .. _. �. -•- - _ - <br /> Mark Capps, R.G. Joel Coffman <br /> Project Geologist Technical Coordinator <br /> cc: Paul Supple ARCO Products Company <br /> Pat Anderson, Regional Water Quality Control Board, Central Valley Region <br /> i <br /> SACIAA2186 LETR.DOC-961mtt:1 <br />