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Bank of Stockton- Cutter Lumber Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 102 2 <br /> January 21,2002 <br />' Extreme care was exercised while collecting samples U prevent agitation of the <br /> water contained in the bailer Water samples were tntnsferred from the bailer <br /> into 40 ml VOA vials preserved with hydrochloric acid (provided by the <br />' analytical laboratory) All samples were checked for hef d space bubbles, labeled, <br /> inserted into foam holders and placed in an ice chest cooled to 4°C for transport <br />' to the laboratory <br /> Gasoline contaminated purge & rinseate water genera ted during the activities <br /> described above was stored in poly drums located on the site American Valley <br /> Environmental will remove this material prior to the next scheduled depth to <br /> water measuring event <br /> 2.2 Groundwater Sample Analyses <br />' Groundwater es were samples analyzed as follows <br /> Y <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method <br />' 5030/8015(m) <br /> • Benzene Toluene, Ethylbenzene and total Xylene (B"'EX) by EPA method 602 <br /> The detection limits are included in the summary analytical data table (Table 2) <br /> Detectable levels of gasoline range petroleum hyd •ocarbons and/or BTEX <br />' compounds were found in four (4) of the eight (8) v< ater samples that were <br /> collected <br />' 2.3 Field Data <br /> The field data for this groundwater monitoring ev 3nt are summarized in <br /> Appendix B and Table 1 The level of groundwater haE fallen about 3 feet since <br /> the groundwater monitoring event completed in June of 2001 The bearing of <br /> the groundwater flow has remained generally consister t Groundwater gradient <br />' calculations for MW-6, 10 & 11 yield the following gradients and directions <br />' Table: Groundwater Gradient, 2000 & 2001 <br /> Date Gradient, Dire -tion/Slope <br /> January 20, 2000 N400E, 0 0021 ft/ft <br />' April 25, 2000 N530E, 0 0018 ft/ft <br /> July 19, 2000 N490E, 0 0044 ft/ft <br /> December 5, 2000 N560E, 0 0023 ft/ft <br /> March 12, 2001 N490E, 0 0016 ft/ft <br />' June 7, 2001 N390E, 0 0035 ft/ft <br /> September 18, 2001 N480E, 0 0042 £t/ft j <br /> December 5, 2001 N6811E, 0 0015 ft/ft <br />' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0293 <br /> 1 <br />