ARCHIVED REPORTS_XR0002455 - Laserfiche WebLink

Home Browse Search

CLEARWATER ' G R O U P Environmental Services water level indicator The water level indicator was thoroughly washed in an Alconox® soap bath and double rinsed with clean tap water prior to placement in each well to prevent possible water quality influence from exterior sources, and to prevent cross contamination Groundwater Ielevations were derived and are tied to previously established well surface elevation data (Table 1) 1 Before sampling, each well was purged until water quality parameters had stabilized Stabilization occurred after approximately three wetted casing volumes had been removed Prior to purging, all wells were checked for the presence of light non-aqueous-phase liquids (LNAPL), none was observed to be present in any well Stabilization measurements of purged groundwater temperature, conductivity, and pH were made and recorded on Monitoring Well Data Sheets for each well Following purging, each well was allowed to recharge to at least 80% of its static water level prior to sampling Groundwater samples were obtained from each well using disposable polyethylene bailers and decanted into clean laboratory supplied bottles Samples were labeled, documented on a chain-of-custody form, and placed on ice in a cooler for transport to the project laboratory Groundwater samples were analyzed by Kiff Analytical Labs, Iocated in Davis I California, a California State-certified laboratory, for concentrations of TPHg, BTEX and MTBE by EPA Method 8260B Groundwater samples collected for NINA data were delivered to CytoCulture Environmental Biotechnology Laboratories (CytoCulture) in Richmond, California All field work was conducted in accordance with Clearwater's Groundwater Monitoring and Sampling Field Procedures and Natural Attenuation Processes and Recommended Monitoring Guidelines included in this report as Appendix A 1 ZB178C RAP 5 May 18,2004