Laserfiche WebLink
E C 0 R - <br /> Statlon #11191 <br /> Quarterly Groundwater Monitoring Report (1Q2006) <br /> April 28, 2006 <br /> Page 2 i <br /> Current Site Information <br /> Current Remediation Techniques Natural Attenuation <br /> Current Quarter Monitorl!nci Data <br /> Wells Monitored and Sampled MW-1 through MW-7 <br /> Sampling Date January 17, 2006 <br /> Dissolved Oxygen Concentrations Unknown <br /> Measured In <br /> Depth to First Groundwater(DTW, feet 49 23 (MW-1) <br /> bgs) <br /> Depth to Lower Groundwater (DTW, feet 51 30 (MW-6) <br /> bgs) <br /> Average Change in Groundwater <br /> Elevation Since Last Event Approximately 3 5 ft <br /> Groundwater Flow Direction and East/Southeast at 0 015 foot/foot (ftlft) <br /> Gradient <br /> . Current Quarter Analytical Data <br /> Minimum/Maximum TPHg ND<50 pg/L - 6,300 pg/L (MW-4) <br /> Concentrations <br /> Minimum/Maximum Benzene ND<O 50 pg/L <br /> Concentrations <br /> Minimum/Maximum MtBE ND<O 50 pg/L - 8,300 pg/L (MW-4) <br /> Concentrations <br /> Minimum/Maximum TBA Concentrations ND<20 IL — 14,000 MW-3 <br /> MONITORING AND SAMPLING PROCEDURES <br /> The current monitoring well network consists of 7 wells (MW-1 through MW-7) that are sampled <br /> quarterly Groundwater samples were collected from each of the wells by Blaine Tech Services, <br /> Inc on January 17, 2006 <br /> The depth to water was measured to within 0 01 feet bgs in the monitoring wells from top of <br /> casing (TOC) using a water level indicator <br /> Well purging and sampling equipment was thoroughly cleaned prior to purging and sampling <br /> each well The sampling procedure for each well included measuring the water level and <br /> checking for the presence of LPH, using either an electronic indicator and a clear Teflon° bailer <br /> or an oil-water interface probe Wells not containing LPH were purged of approximately three <br /> casing volumes of water (or to dryness) using a submersible pump or bailer During purging, <br /> temperature, pH, and electrical conductivity were monitored After purging, water levels were <br /> allowed to recover to 80% of the original levels prior to collection of the water sample <br /> I IBP-ARCO105 BP-COP Sites1111911ReportMQMRs111191 1Q06 QMR final doc SECOR International Incorporated <br />