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l I <br /> Ms Margaret Lagorio Project No 880-040 1A <br />' November 8, 2002 <br /> Page 4 <br /> intervals for description and possible chemical analysis The monitoring wells are <br /> constructed of 2-inch-diameter Schedule 40 PVC casing and 0 020-inch machine-slotted <br /> well screen The wells are screened from approximately 10 to 25 feet bgs The annular <br /> space around the screen is packed with SRI Supreme#8 sand to approximately 2 feet <br /> above the top of screen The sandpack is followed by a 2 foot seal of bentonite chips <br /> t hydrated with clean water, then neat cement to approximately 1 foot bgs The top of the <br /> well is protected by a vault box, locking well cap, and lock The vault box is installed <br /> flush with the ground surface, and is set in concrete Construction of wells MW-4 and <br />' MW-5 is similar to that of the existing site monitoring wells Drilling and sampling ✓ <br /> procedures are included in Attachment B <br /> Three soil samples from each well boring were submitted to the laboratory for the <br /> analysis of Total Petroleum Hydrocarbons as gasoline (TPHg) by EPA Method 8015, <br /> and benzene, toluene, ethylbenzene, and total xylenes (BTEX), di-isopropyl ether <br /> (DIPS), ethyl tertiary butyl ether (ETBE), MtBE, tertiary amyl methyl ether (TAME), <br />' and tertiary butyl alcohol (TBA), collectively the `five oxygenates', by EPA Method <br /> 8260B (modified) <br /> Blaine Tech Services developed the two downgradient wells MW-4 and MW-5 on <br /> June 6, 2002 Field data collected during well development are included in <br /> Attachment C <br />' Upon completion of well construction, the wellheads were surveyed by Morrow <br /> Surveying, a licensed surveyor, for location and elevation relative to mean sea level <br /> The surveyor's report is included at Attachment D <br /> r <br /> Installation of One Deep Boring <br /> On May 22, 2002, one deep boring was advanced adjacent to well MW-1 to define the <br /> vertical extent of MtBE in soil and groundwater at the site The boring was advanced <br /> using hollow stem auger techniques This boring was continuously cored from <br />' N WandplkPro}ectsProtects1880104011a101101Anessment and Intenm Remedial Reportdoc <br />