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Geological Technks Inc Page 3 <br /> Groundwater Monitoring Report <br /> Project No 723 2 <br /> March 15,2002 <br /> 1 <br /> Vertical gradient calculation formulas are as follows <br /> t • vertical correction for gradient [(gw gradient slope) x (distance) = vertical correction] <br /> vertical head [(head of deep well) - (head of shallow+ correction) =vertical head] <br /> • vertical gradient [(vertical head) /(vertical distance) =vertical gradient] <br /> ' For the December 20 nt the vertical adient for the MW-3/MW-201 air wa 0 06 <br /> � P <br /> ft/ft , in a positive upward) rection <br /> 1.2 Groundwater Sampling Procedure <br /> ' On December 11, 2001, Del-Tech Geotechnical Support personnel arrived on-site, opened <br /> the wells and measured the depth to water with an electrically actuated sounding tape The <br /> ' water level readings were recorded to an accuracy of 0 01 feet In wells where free-floating <br /> product was suspected, a clear disposable bailer was used to gauge the interface During <br /> this monitoring no free product was noted <br /> ' Stagnant water in the well casing was purged using a Waterra pump as recorded in the field <br /> logs (Appendix C) The rate of well purging was monitored The wells were purged of <br /> approximately three casing volumes and until the groundwater parameters (temperature, <br /> conductivity and pH) had stabilized (Appendix C) indicating that water representative of <br /> actual aquifer conditions was entering the well Groundwater parameter stabilization was <br />' characterized by three successive readings within 10% <br />' Before a sample was collected, the well's water level was allowed to recharge to at least <br /> 80% of the initial level The purge water was placed in a 55-gallon DOT (Department of <br /> Transportation 17-H) approved container that is properly labeled and temporarily stored on- <br /> site <br /> The dedicated Waterra pump was used to collect each monitoring well sample Extreme <br /> ' care was exercised while transferring the sample into 40-m1 VOA vials preserved with <br /> hydrochloric acid All samples were checked for headspace bubbles, labeled, inserted into <br /> foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory <br /> ' The sampling technician wore disposable gloves while collecting all samples <br />' A chain of custody document, listing all samples collected and their intended analyses, <br /> accompanied the samples from field to the Iaboratory, thereby providing a means to track <br /> their movement and ensure their integrity <br />