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Lammersville School District March 3, 1992 02320 2324 Page 2 sampling of two sod borings, well installation and development, groundwater sampling, and surveying of the new and existing monitoring wells 31 WORK PLAN/PERMIT PREPARATION AND SUBMITTAL Groundwater Technology submitted a work plan for investigation at the site to Mr Kenneth Olds of the District on October 18, 1991 The District was advised of the receipt of the work plan by the SJCEHD on October 23, 1991 The SJCEHD reviewed the work plan and responded to the District with exceptions on November 21, 1991 The exceptions included lack of evidence of permission to encroach on County property, and incomplete well permit applications Groundwater Technology provided the SJCEHD a final submittal on December 30, 1992 Final approval of well permits came from the SJCEHD on January 15, 1992 3 2 SOIL BORINGS On January 24, 1992, two soil borings (SB) were drilled to further determine subsurface conditions beneath the site (Figure 2) The borings were drilled using a truck-mounted drill rig equipped with 8 5- inch outside diameter (0 D ),hollow stem flight augers The drilling was supervised by a field geologist working under the direction of a California registered geologist A continuous log of materials encountered while drilling was completed by the field geologist using the Unified Soil Classification System (Appendix A) Each boring was drilled to a depth of 20 feet below grade surface (BGS) Water was encountered in each boring at approximately 6 feet BGS All soil generated during the drilling operation was placed in 55-gallon drums and stored on site pending proper disposal 3 3 SOIL SAMPLING Sal samples were collected continuously in each boring The samples were collected using a 2 5-inch O D modified California split-spoon sampler, lined with three 2 5-inch-diameter by 6-inch-long brass sample tubes At each sample interval, a split-spoon sampler was driven 18-inches ahead of the lead auger Field observations and headspace screening for volatile organic compounds (VOC) using a portable photoionization detector (PID), were used to field-screen the subsurface materials for hydrocarbons The results of PID screening are shown on the boring logs (Appendix A) The samples were subsequently sealed, labeled, and placed on ice in an insulated container All samples were shipped with the appropriate chain-of-custody manifest to Sequoia Laboratories in Sacramento, California Selected samples from each soil boring were analyzed for benzene, toluene, ethylbenzene . and xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPH-G) by EPA methods 50301802018015 21240SRI RPT __j: GROUNDWATER J, TECHNOLOGY