ARCHIVED REPORTS XR0009441 - Laserfiche WebLink

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Mr Steve Schneider San Joaquin County Public Health Services November 20, 1992 Page 2 Sod Sampling and Analyses Sod samples will be screened in the field using a photo-ionization detector (PED) Up to two soil samples will be collected from each borehole for laboratory analyses In general, the sample exhibiting the highest PID reading and the next deeper sample that would be expected to contain nondetectable results will be selected for analyses Samples selected for laboratory analyses will be collected in brass tubes The tubes will be sealed with aluminum foil, plastic caps and duct tape, labeled and placed on ice in an insulated cooler for transport to a California-certified laboratory The samples will be analyzed for aromatic volatile organics and total petroleum hydrocarbons (TPH)-as-gasoline using EPA Methods 5030/8020/8015, and TPH-as-diesel using EPA Methods 3550/8015 Sod cuttings from drilling activities will be added to onsite stockpiled soil It is anticipated that the sod will be nonhazardous since the drilling locations are designed to be on the perimeter of the plume Monitoring Well Installation and Develo ment A groundwater mons ng well will be installed in each of the four sod borings The wells will be completed with 15 feet of 2-inch diameter, 0 020-inch slotted, PVC screen The wells will be finished to the surface with 2-inch diameter PVC casing The annular space between the borehole and casing will be backfilled with No 2 sand from the well completion depth to approximately 1 foot above the well screen Prior to installation of the sanitary seal, suspended sediment will be removed from the wells using a surge and bad technique to remove suspended sediment and improve hydraulic communication with the surrounding water-bearing zone All development water will be placed in 55-gallon drums, labeled and stored on site pending laboratory analyses to determine a proper disposal method Following well development, a sanitary seal consisting of i 1h to 2 feet of bentonite followed by cement grout will be installed to within approximately 1 foot of surface grade The wells will be finished with a water-tight locking cap inside a traffic-rated street box set in concrete Groundwater Sampling Groundwater sampling of wells MW-7 through MW-10 will be Incorporated into the next quarterly monitoring and sampling event scheduled following installation It Is anticipated that this event will be • the January 1993 quarterly sampling event GROUNDWATER TECHNOLOGY, INC