Laserfiche WebLink
1 <br /> Project No S8100-06-IIB <br /> April 19, 1996 <br /> Depth to groundwater measurements were obtained from each monitoring well prior to well purging <br /> Groundwater depth measurements were obtained using a battery operated water level meter with <br /> measurements obtained from the top of each well casings <br />' Prior to groundwater collection, three to five casing volumes of groundwater were purged to allow <br /> fresh formation water to infiltrate the wells During purging, the pH, temperature, and electrical <br /> conductivity of the groundwater was measured and the purging was considered adequate when these <br /> parameters stabilized Groundwater recovery was monitored in order to ensure 80 percent well <br /> recovery prior to well sampling The groundwater parameters were recorded on the groundwater <br /> sample collection logs presented in Appendix C <br /> Groundwater samples were collected utilizing disposable polyethylene bailers The samples were <br />' placed in laboratory provided volatile organics analysis vials and one-liter amber bottles, labeled, <br /> chilled, and delivered to a California certified analytical laboratory, following standard chain-of- <br /> custody procedures <br />' Well development and monitoring well purge water was placed to DOT 17-H 55-gallon drums and <br /> stored onsite pending the receipt of analytical data and subsequent disposal following regulatory <br />' protocol <br /> 3 5 Well Survey <br /> The elevations of the top of each well casing were surveyed by a Geocon registered civil engineer <br /> relative to the monitoring well MW-7 casing elevation of 6 48 meters (21 27 feet) above Mean Sea <br />' Level (MSL) A copy of the well elevation survey report is presented in Appendix D <br /> 3 6 Laboratory Analytical Methods <br />' Soil samples were delivered to Sparger utilizing standard chain-of-custody procedures Soil samples <br /> were submitted for the analyses of TPHg and TPHd following EPA Test Method 8015 modified and <br />' BTEX following EPA Test Method 8020 Soil samples exhibiting the highest TPHg and/or BTEX <br /> concentrations and the soil samples collected at the capillary fringe were further tested for MTBE <br /> following EPA Test Method 8020 <br />' Groundwater samples were transported to Sparger for testing for TPHg and TPHd following EPA Test <br /> Method 8015 modified, and BTEX and MTBE following EPA Test Method 8020 <br /> 1 <br />' 7 <br /> 1 <br />