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® � r <br /> A S S 0 C 1 A T E S I N C5 <br /> �Q <br /> �5 <br /> Five soil borings will be advanced employing hollow stem auger equipped drill rig to first <br /> encountered groundwater, anticipated to be approximately 55 feet bgs. Drilling will be conducted <br /> by a C-57 State licensed drilling company. A field geologist will be present to log soil samples. <br /> Descriptions of soil types encountered and sample collection intervals will be recorded on boring <br /> logs. Soil samples will be collected at five-foot intervals. Each soil sample will be field screened <br /> with a Photoionization Detection (PID) meter or similar instrument and at least two soil samples <br /> from each of the five borings, based on field observations (i.e. odor, discoloration, PID readings), <br /> will be placed in a cooler with ice and submitted for laboratory analysis. <br /> A groundwater sample will be collected from the soil boring using a hydropunch groundwater <br /> sampler. Following soil and groundwater sample collection, the boring will be backfilled with l� <br /> grout to the surface or completed as a monitoring well. All drill cuttings will be stored on site in <br /> 55-gallon drums. <br /> Groundwater Monitoring Well Construction Details r Y S <br /> One soil boring will be completed as a monitoring well to a depth of approximately 55 feet bgs. <br /> The monitoring well will be constructed of 2-inch inside diameter schedule 40 PVC well screen <br /> and casing. A 0.020-inch well screen slot and #2112 mesh sand pack will be used. Neat cement <br /> will be used to seal the well in accordance with California Well Standards (December 1981). To <br /> protect the integrity of the well, locking, a water-tight well plug will be installed on the well and a <br /> water-tight wellhead labeled "monitoring well" will be concreted over the well. The top of casing <br /> of the new wellhead will be surveyed and tied into the existing groundwater monitoring wells to <br /> assess groundwater gradient and flow direction. Groundwater monitoring well construction <br /> details are shown on Figure 6. <br /> Groundwater Monitoring Well Development and Sam lin <br /> Measurement of depth to water in any new well and the existing wells will be completed to <br /> evaluate the direction and magnitude of the groundwater gradient beneath the site. The new <br /> well(s) will be developed using surge and bail techniques until the produced water is relatively 1, <br /> sediment free. Prior to the collection of a groundwater sample, a minimum of three well volumes 0, ovo <br /> (casing and sand pack) will be purged. Temperature, pH, water elevation, and electric )"0''�Vty <br /> conductivity will be measured and allowed to stabilize. The water sample will be collected using a �n S <br /> disposable bailer. <br /> Each groundwater sample will be submitted using chain-of-custody record to a State-certified <br /> laboratory. Purge water will be stored on site in 55-gallon drums approved for hazardous liquid <br /> storage pending laboratory analysis. <br /> w:192054.00011reporlslWkpin_add_inv.doc 4 <br />