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Blaes Environmental Management Inc U-Haul#709-50 002-70950-03 Groundwater Monitonng Report 10/22/01 • to accommodate the higher groundwater levels Wells at the site are now screened across three depth intervals These depth intervals include "lower" (C) well casings screened at depths ranging from approximately 60 to 100 feet below ground surface (bgs), "middle" (B) well casings screened at depths ranging from approximately 45 to 77 feet bgs, and "upper" (A) well casings screened at depths ranging from approximately 23 to 62 feet bgs These screened intervals accommodate fluctuations in groundwater depth that have ranged from approximately 45 to 90 feet bgs since 1993 (SOTA, 1997) Monitor well construction information is summarized in Table 1 2 4 PREVIOUS RESULTS Previous work performed by Blaes Environmental has included quarterly groundwater monitoring completed in March and July 2001 These two quarterly groundwater monitoring events included sample collection from all possible monitoring points The list of well casings available for groundwater monitoring and sampling is provided in Table 1 2 4 1 Previous Groundwater Level Measurements Previous groundwater level measurements indicated a decrease in water levels of approximately 5 to 6 feet from March to July 2001 Groundwater level measurements recorded in March 2001 ranged from 45 05 feet below top of casing (BTOC) at MW-7 to 47 22 feet BTOC at MW-6 Groundwater level measurements recorded in July 2001 ranged from 49 94 feet BTOC at MW-7 to 53 25 feet BTOC at MW-6 No free-phase hydrocarbons were observed during collection of groundwater level measurements in March or July 2001 The groundwater flow direction in March 2001 was inconclusive since the groundwater surface was relatively flat The average groundwater flow direction in July 2001 was variable between the "B" and "C" casing wells The water levels recorded at the"B" casing wells indicated groundwater flow direction toward the southwest with well MW-513 having the highest relative groundwater level and well MW-913 having the lowest relative groundwater level The water levels recorded at the "C" casing wells indicated groundwater flow direction toward the north with well MW-7 having the highest relative groundwater level and well MW-2 having the lowest relative groundwater level 4