Laserfiche WebLink
Bank of Stockton - Cutter Lumber Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 102 2 <br /> • April 24,2002 <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 acid (provided by the <br /> analytical laboratory) All samples were checked for head 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 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 /> 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) 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 hydrocarbons and/or BTEX <br /> compounds were found in four (4) of the six (6) water samples that were <br /> 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 somewhat over 2 <br /> feet since the groundwater monitoring event completed on December 5 of 2001 <br />' The bearing of the groundwater flow has remained generally consistent <br /> Groundwater gradient calculations for MW-6, 10 & 11 yield the following <br /> gradients and directions <br /> Table: Groundwater Gradient, 2000 & 2001 <br /> Date Gradient, Direction/Slope <br />' January 20, 2000 N40-E, 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 N56-E, 0 0023 ft/ft <br /> March 12, 2001 N49-E, 0 0016 ft/ft <br /> June 7, 2001 N39-E, 0 0035 ft/ft <br /> September 18, 2001 N48-E, 0 0042 ft/ft <br /> December 5, 2001 N680E, 0 0015 ft/ft <br /> March 20, 2002 N660E, 0 0028 ft/ft <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> I <br />