ARCHIVED REPORTS_XR0007990 - Laserfiche WebLink

Home Browse Search

Ski Y `also analyzed for total lead by EPA Method 7420 The analytical results for soil samples are summarized in Table 1 Laboratory data sheets and chain-of-custody documentation are included in Appendix B L. Groundwater Monitoring Well Construction Soil borings MW1, MW2, and MW3 were completed as groundwater monitoring wells to assess potential hydrocarbon impact to groundwater beneath the site and to provide measurement points ' for the determination of groundwater flow direction and hydraulic gradient The wells were surveyed to NAD83 and NGVD29 benchmarks for position and elevation Survey results are summarized in Table 2 and referenced in Table 3 The surveyors report is contained in Appendix ' C Each well was constructed with 2-inch PVC casing to depths of approximately 65 feet bgs The screened interval of each well was positioned from approximately 5 feet above to 15 feet below the encountered water table to allow for seasonal water level fluctuations The screen slot size is 0 010-inch and the wells were surge blocked to ensure an adequate sand pack was in place Well construction details are depicted on the boring/well logs contained in Appendix A 2_4 Monitoring Well Develo ment Groundwater monitoring wells MW1, MW2, and MW3 were developed on January 15, 2004 ' Each well was purged until the extracted water was relatively sediment free Development logs are included in Appendix D Purgewater was temporarily stored on site in 55-gallon drums pending proper disposal ' 2_5 Groundwater Sampling and Analyses ' On January 15, 2004, groundwater samples were collected from wells MW1, MW2, and MW3 Prior to purging and sampling, fluid levels in the wells were measured on January 15, 2004, utilizing an electronic water probe capable of measuring with an accuracy of 1/100 of a foot ' Groundwater elevation data are presented in Table 3 The samples were collected after purging a minimum of three well volumes and stabilization of electric conductivity, pH, and temperature Field purge logs are presented in Appendix D Subsequent to purging, groundwater was sampled ' and transferred to appropriate sample containers, using clean, disposable bailers with bottom emptying devices to reduce volatilization ' Groundwater samples were placed on ice and delivered under chain-of-custody documentation to Argon Laboratories for chemical analysis Groundwater samples were analyzed for TPHg and TPHd by EPA Method 801513, BTEX by EPA Method 8021B, and MTBE, TAME, TBA, ETBE, ' DIPE, 1,2-DCA, and EDB by EPA Method 8260 The analytical results for groundwater samples . are summarized in Table 4 Laboratory data sheets and chain-of-custody documentation are included in Appendix E w 126874Veports`sum doc 3