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Bank of Stockton Cuttei Lumber Site Page 4 <br /> Quaiteily Gioundwatei MonitomigRepoit <br /> Pioject No 102 2 <br /> Awwsl 19 2002 <br /> Extreme care was exercised while collecting samples to prevent agitation of the <br /> water contained in the bailee Watei samples were transferred from the bailer <br /> into 40 ml VOA vials preserved with hydrochloric acrd (provided by the <br /> analytical laboratory) All samples were checked for head space bubbles, labeled, <br /> inserted into foam holders and pla(ed in an ice chest cooled to 4°C for transport <br /> to the laboratory <br /> Gasoline contaminated purge & rrnseate water generated 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 /> 22 Groundwater Sample Analyses <br />' Groundwater samples were analyzi,d as foliows <br /> • Total Petroleum Hydrocarbon, as G i,,olrne (TPH-G) by EPA method <br /> 5030/8015(m) <br /> • Benzene Toluene, Ethylbenzene and total Xylene (BTEX) by EPA method 602 <br /> The detection limits aie included in the suinniaiy analytical data table (Table 2) <br /> Detectable levels of gasoline range petroleum hydrocarbons acid/or BTEX <br /> compounds were found in ,5 of the 8 water -,amples that were collected <br /> I2 3 Field Data <br /> The field data for this gioundwtiter monitoring event are summarized in <br /> Appendix B and Table 1 The level of groundwater has fallen almost one foot <br /> since the groundwater monitoring event completed on March 20 of 2002 The <br />' bearing of the groundwater flow rias remained generally consistent <br /> Groundwater gradient calculations for MNAI-6, 10 & 11 yield the following <br /> gradients and directions <br /> Table. Groundwater Gr adient, 9.000 & 2001 <br /> Date I Gradient Direction/Slope <br /> January 20, 2000 �N1400E,, 0 0021 ft/ft <br />' Apid 25, 2000 X530E 0 0018 ft/ft <br /> July 19, 2000 R 19°la 0 0044 ft/ft <br /> December 5, 2000 N560E, 0 0023 ft/ft <br />' Maich 12, 2001 N490L 0 0016 ft/ft <br /> June 7, 2001 N390E, 0 0035 ft/ft <br /> Septembei 18, 2001 N480E 0 0042 ft/ft <br /> December 5 2001 1NOSOE 0 0015 ft/ft <br /> Maich 20, 2002 NWE, 0 0028 ftlft <br /> June 17, 2002 N'49°Fl, 0 0033 ft/ft <br /> 2937 V#-neman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-029.3 <br /> 1 <br />