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I <br /> Bank of Stockton - Cutter Lumber Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br /> ' Project No. 102.2 <br /> July 20, 2005 II <br /> Extreme care was exercised while collecting samples to prevent agitation of the <br /> water while filling the sample containers. Water samples were transferred <br /> from the bailer into 40 ml VOA vials preserved with hydrochloric acid (provided <br /> by the analytical laboratory). All samples were checked for head space bubbles, <br /> labeled inserted into foam holders and placed in an ice chest cooled to 4°C for <br /> transport to the laboratory. <br /> Gasoline contaminated purge & rinseate water generated during the activities <br /> described above was stored in poly drums located on the site. American Valley <br /> Waste Oil will remove this material prior to the next scheduled depth to water <br /> measuring event. <br /> 1 2.2 Groundwater Sample Analyses <br /> Groundwater samples were analyzed as follows: <br /> ' • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method <br /> 503018015(m). <br /> Benzene Toluene, Ethylbenzene and total Xylene (BTEX) and MTBE by EPA <br /> ' method 602 <br /> The detection limits are included in the summary analytical data table (Table 2). <br /> i <br /> Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX <br /> ' compounds were found in 4 of 5water samples that were collected. <br /> ' 2.3 Field Data <br /> The field data for this groundwater monitoring event are summarized in <br /> Appendix B and Table 1. The level of groundwater has risen about risen as <br /> ' much as 1 foot since the groundwater monitoring event completed on March 17, <br /> 2005. The bearing and gradient of groundwater flow was calculated. Normally <br /> this calculation is based on a 3-point solution for wells MW-6, 10 & 11, but in <br /> ' this case MW-10 was inaccessible and an alternative point was selected. The <br /> historical calculations of gradients and directions are summarized in the <br /> I ' following table: <br /> Table: Groundwater Gradient, 2004 & 2005 <br /> Date Gradient; Direction/Slope <br /> March 16, 2004 N37-E, 0.0047 ft/ft <br /> June 7, 2004 N48-E, 0.0042 ft/ft <br /> September 1, 2004 N60-E, 0.0052 ft/ft <br /> December 23, 2004 N23-E, 0.0034 ft/ft <br /> March 17, 2005 N39-E, 0.0047 ft/ft <br /> June 14, 2005 N7611E, 0.0111 ft/ft <br /> I ' 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0293 <br /> i t <br />