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2.7 MonitoringWells Survey y Newly installed groundwater monitoring well MW-7 and all previously existing groundwater monitoring wells were surveyed on 21 April 2004 by Virgil Chavez Land Surveying, Inc Survey coordinates and elevations are included in Table 3 2.8 Laboratory Analyses of Soil and Groundwater Samples ' Based on field observations, between one and four soil samples from boreholes HA-1, HA-2, HA-4, HA-6, HA-7, and MW-7, for a total of twelve, were analyzed on site by the TEG Mobile Laboratory for TPHg and TPHd by EPA method 8015M The original work plan ' called for BTEX analyses, but this requirement was waived in the field by Mr Jeff Wong at SJCEHD Eight additional soil samples from boreholes HA-8, HA-9, and TANK-EX were analyzed by Kiff Analytical at their fixed laboratory for TPHg and TPHd by EPA Method 8015M Copies of the COCs and laboratory results are included in Appendix C A total of seven groundwater Hydropunch samples from boreholes HA-1 through HA-7 were ' analyzed on site by the TEG Mobile Laboratory for TPHg and TPHd by EPA method 8015M The original work plan called for BTEX analyses, but this requirement was waived in the field by Mr Jeff Wong at SJCEHD MW-7 will be sampled during the Second Quarter 2004 monitoring event 2.9 Quality Assurance/Quality Control (QA/QC) For on-site analyses, QA/QC was assessed during soil and groundwater sampling by utilizing a new calibration standard each day, and running blanks to ensure there was no carry-over l from previous samples QA/QC procedures for the fixed laboratory included blanks, ie laboratory control samples, and matrix spike samples The QA/QC results were within the acceptable limits The fixed and on-site laboratory adhered to their QA/QC procedures for sample handling, analyses, equipment operations, and data reporting 2.10 Decontamination of Field Equipment I ' All equipment used for drilling, sampling, monitoring well installation, and monitoring well development were properly decontaminated prior to and between each use Drill equipment, such as the lead bit and hollow stem augers, were steam cleaned and air dried Soil sampling ' equipment, such as the split spoon sampler and brass tubes, was subject to a three-bucket wash The three-bucket wash consisted of scrubbing in a tap was and phosphate-free detergent mix, tap water rinse, and a final deionized water rinse followed by air drying ' 2.11 Soil and Water Residuals Management The soil, purge water, decontamination water, and development water generated during field activities were stored on-site in labeled 55-gallon drums The soil and water waste were profiled as non-hazardous and are scheduled to be disposed of by MP Environmental in May 2004 at an appropriate disposal/recycling facility 1 6