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� k1 4 Mr Sam Savig Project 880-040 IA December 4, 2001 Page 3 TPH-g was detected in wells MW-1 and MW-3 at concentrations of 14,000 micrograms per liter (µg/1), and 760 µg/1, respectively Benzene was detected in wells MW-1 and MW-3 at concentrations of 1,100 µg/l and 3 5 µg/l, respectively MtBE was detected in wells MW-1, MW-2 and MW-3 at concentrations of 24,000 µg/l, 3,100 µg/l, and 600 µg11, respectively TAME was reported in wells MW-1, MW-2 and MW-3 at concentrations of 190 µg/l, 21 pg/l and 4 6 µg11, respectively TBA was reported in MW-1 at a concentration of 2,400 pg/l Groundwater analytical data are presented in Table 1 A TPH-g, benzene, and MtBE concentration map based on the November 1, 2001 data is shown on Figure 2 CONCLUSIONS Groundwater levels have decreased an average of 101 feet since the third quarter 2001 sampling event Groundwater samples indicate a decrease in TPH-g concentrations in MW-2 and MW-3 and a general decrease in BTEX constituents in all three wells since the previous sampling event MtBE concentrations have decreased in MW-1 and MW-2 MtBE concentrations have increased slightly since the previous sampling event in MW RECOMMENDATIONS At the request of SJCPHS/EHD, a work plan will be prepared to define the vertical and lateral extent of soil and groundwater contamination and identify interim remedial alternatives to control the off-site migration of MtBE This work plan will be submitted by December 17, 2001 If there are any questions regarding the contents of this report, please call Kathleen Waldo at (916) 565-4370 or Mike Sgourakis at (916) 565-4369 Sincerely, RSD Gco l� IT CO ORATION AA�CHAEL G' S, SGOURQMs � NO 7194 Kathleen A Waldo Mike Sgourakis, RG �� Staff Engineer Project Geologist CA4d� i 1r CORPORATION SAC 111SACRFPIICOMMONIsacDP120011PRJ\PJ818800401A lab doe-011kt 1 (01070000)