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' Bank of Stockton- Cutter Lumber Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 102 2 <br /> $ August 1999 <br />' Extreme care was exercised while collecting samples to prevent agitation of the <br /> water contained in the bailer Water samples were transferred from the bailer <br /> into 40 ml VOA vials preserved with hydrochloric (provided by the analytical <br />' laboratory) All samples were checked for head space bubbles, labeled, inserted <br /> into foam holders and placed in an ice chest cooled to 4°C for transport to the <br /> laboratory <br /> Gasoline contaminated purge & rinseate water generated during the activities <br /> 1 described above was stored on 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 Documentation of the disposal of purge water from the <br />' last monitoring event is herein attached as Appendix C <br /> 2.2 Groundwater Sample Analyses <br /> Groundwater samples were analyzed as follows <br />' • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(m) <br /> • Total Petroleum Hydrocarbons as Diesel (TPH as Gasoline) by EPA method <br />'• 3030/8015(m) <br /> The detection limits are included in the summary analytical data table (Table 2) <br />' Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX <br /> compounds were found in water samples from all the wells which were sampled <br />' Wells MW-1 and MW-4 were not sampled in this round <br /> 2.3 Field Data <br /> 1 The field data for this groundwater monitoring event are summarized in <br /> Appendix B and Table 1 The level of groundwater has fallen approximately two <br />' feet since the groundwater monitoring event completed in March of this year <br /> The bearing of the groundwater flow has remained generally consistent however <br /> Groundwater gradient calculations for MW-6, 10 & 11 yield the following <br /> gradients and directions <br /> Table: Groundwater Gradient, 1999 <br /> Date Gradient, Direction/Slope <br /> January 19, 1999 N430E, 0 0024 ft/ft <br />' March 2, 1999 N54-E, 0 0017 ft/ft <br /> • March 24, 1999 N450E, 0 0023 ft/ft <br /> July 7, 1999 N4011E, 0 0038 ft/ft <br />' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 589-0293 <br />