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I19 February 1997 <br /> AGE-NC Project No 95-0104 <br />' Page 2 of 6 <br /> the following boring location, depth, time, date, and sampler's initials The samples were placed in <br /> a chilled container and transported under chain-of-custody protocol to a California state-certified <br /> laboratory for analysis of total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile <br /> I aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) and methyl tertiary butyl ether <br /> (MTBE) in accordance with EPA methods 8015M and 8020, respectively <br /> Furthermore, selected soil samples were also analyzed for permeability, porosity and percent organic <br /> content in accordance with ASTM method D5084 <br /> 2 1 2 EQUIPMENT DECONTAMINATION <br /> I Hollow stem augers were steam cleaned prior to any boring advancement Sampling tools and brass <br /> sleeves used for sample collection were thoroughly washed with a solution of Liquinox, and rinsed <br /> twice with clean tap water prior to each sampling run <br /> I <br />'• 2 1 3 BORING LOGS <br /> During drilling activities, sample duplicates were described on boring logs using the Unified Soil <br /> I Classification System (USCS), and monitored for the presence of organic vapors using a photo- <br /> ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) Boring <br /> logs are summarized in Appendix A <br /> 2 1 4 WELL COMPLETION <br />' Soil borings MW-5 and MW-6 were completed as 2-inch diameter ground water monitoring wells <br /> When the total depth of the boring was achieved, a well casing was emplaced through the hollow <br />' stem of the augers The augers were incrementally raised as a 93 Lonestar Lapis Luster sand was <br /> slowly poured down the annulus between the well casing and the inner wall of the hollow stem auger <br /> The filter pack was placed adjacent to the screen (0 020 inch screen size) from the bottom of the <br />' boring to a point approximately 2 feet above the top of the screen An approximate three-foot seal <br /> of bentonite chips was placed above the filter pack and hydrated with clean tap water The remaining <br /> annular space was sealed with grout As-built monitoring well construction diagrams are included as <br />' Figures 3 and 4 -Monitoring Well Construction Diagranr <br />' 2 1 5 MONITORING WELL SURVEY <br /> Following well installatio a reference point was marked on the to of each well head, and surveyed <br />' g n, P P <br /> 1 <br />