ARCHIVED REPORTS XR0009329 - Laserfiche WebLink

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drill rig The bore hole diameter was 8 inches A California Registered Geologist from Ramage Environmental logged each bore hole during drilling and constantly checked the drill cuttings for indications of both the first recognizable occurrence of groundwater and contaminants A portable photoionization detector (PID) (corroborated by smell) was used to determine the occurrence of contaminants For soil borings MW-1 and MW-3, a split-barrel sampler was driven at five (5) foot intervals into the bottom of each soil boring by a 140-pound drop hammer as the boring was advanced, through the hollow stem of the 8-inch diameter continuous-flight auger The sampler was extracted from the bore hole and the brass tubes, containing the soil samples, were removed Upon removal from the sampler, the selected brass tubes were immediately trimmed and capped with Teflon sheets and plastic caps The samples were then labeled and placed in a cooler of ice for delivery, under chain-of-custody protocols, to the analytical laboratory The analytical laboratory selected for sample analysis was Precision Enviro-Tech Analytical Laboratory in Stockton, California For soil boring B-5, continuous core technique was utilized and advanced using a nominal 8-inch diameter truck mounted hollow-stem auger With continuous core technique, the auger was inserted into the ground and the soil samples collected and extracted to provide a continuous core sample A portion of each soil sample collected was analyzed in the field using a PID The purpose of this field analysis was to qualitatively determine the presence or absence of volatile petroleum hydrocarbons The portion of soil was sealed in a Ziploco plastic bag and left in the sun to allow for volatilization of VOC's, if present The PID was then used to measure the concentrations of hydrocarbons within the headspace inside the plastic bag The data were recorded on the boring logs at the depth corresponding to the sampling point (see discussion of PID data in Section 4 2 and Monitoring Well Logs in Appendix A) Each boring was advanced slowly to allow for identification of changes in soil types The soil boring was logged and soils described in accordance with the Unified Soil Classification System (USCS) Emir meerirg,Inc. Project No 99-01202 4