Laserfiche WebLink
i <br /> t _ <br /> Mr. Harlin Knoll Project No. 2007-065-01 <br /> April 28, 2000 <br /> Page 3 <br /> A staff geologist will collect soil samples at 5-foot intervals using a standard California- <br /> modified Split Spoon Sampler. Soil samples will be classified using the Unified Soil <br /> Classification System. The soil samples will be field screened for the presence of <br /> petroleum hydrocarbons using a photoionization detector (PID). Two soil samples will <br /> be submitted for chemical analysis from each boring, the sample exhibiting the highest <br /> PID response and the sample from just above first-encountered groundwater. Procedures <br /> pertaining to the collection of samples are detailed in Appendix A. <br /> All generated drill cuttings and excess soil samples will be stored on site, and placed on <br /> and covered with visqueen. A composite sample will be collected from the soil cuttings <br /> and will be analyzed to determine an appropriate disposal method. <br /> The soil samples will be analyzed by a state-certified laboratory for total petroleum. <br /> hydrocarbons as gasoline (TPHG), and benzene, toluene, ethylbenzene and xylene <br /> isomers (BTEX) using U.S. Environmental Protection Agency (USEPA) Method 8020 <br /> Modified, and for oxygenates (including Methyl Tertiary Butyl Ether [MTBE], Ethyl <br /> Tertiary Butyl Ether [ETBE], Diisopropyl Ether [DIPE], Tertiary Amyl Methyl Ether <br /> [tAME], Tertiary Butanol, Tertiary Butyl Alcohol [TBA], and 1,2-Dichloroethane (1,2- <br /> DCA) using USEPA Method 8260. In addition, the composite soil sample will be <br /> analyzed for TPHG and BTEX using USEPA Method 8015/8020 Modified, and for total <br /> lead using USEPA Method 6010. <br /> Task 2B - Groundwater Monitoring Well Installation. <br /> Stratus will observe the construction of two 2-inch-diameter groundwater monitoring wells <br /> in the 45-foot soil borings. The wells will be constructed using 20 feet of 0.02-inch <br /> machine-slotted polyvinyl casing (PVC), set at a depth of approximately 45 feet bgs. The <br /> proposed well construction is based on a groundwater elevation of approximately 35-feet <br /> bgs and may be modified in the field due to changes in site conditions. The screen interval <br /> of the well is proposed to be ;10 feet above and 10 feet below the first encountered <br /> groundwater. <br /> Stratus will observe the construction of one 2-inch-diameter air sparge well, in the third <br /> 45-foot boring. The well will be constructed using 2-feet of 0.02-inch machine-slotted <br /> polyvinyl casing (PVC), set at a depth of approximately 45 feet bgs. The proposed well <br /> construction is based on a groundwater elevation of approximately 35-feet bgs and may be <br /> modified in the field due to changes in site conditions. The screen interval of the well is <br /> proposed to be 2-feet, set approximately 10-feet below the first encountered groundwater. <br /> A filter pack consisting of Lonestar#3 sand will be placed in the annular space between the <br /> PVC casing and the borehole wall. Sand will be added to the borehole through the hollow- <br /> stem augers to provide a uniform filter pack around the casing and to stabilize the borehole. <br /> The sand pack will be placed to a maximum of 2 feet above the screens, followed by a 3- <br /> CA65wrkpin.doc Stratus <br />