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Site Background Information Comfort Air, IIIc AGE-NC Project No 95-0141 IPage 3 of 3 monitoring wells MW-8B,MW-9A/B,MW-10A/B,MW-11A/B and MW-12A/B)and one ground water monitoring/extraction well EX-1 Pilot borings MW-8B,MW-9AB,MW-10A/B,MW-11AB and MW-12AB were completed as ground water monitoring wells using two-Inch diameter PVC ' casing with 0 020-inch slotted screen The screen was installed from approximately 15 to 35 feet bsg in MW-9A through MW-12A, and from 60 to 65 feet bsg in wells MW8B through MW-12B, with blank casing extended to the surface Pilot boring EX-1 was completed as a ground water extraction I well with 0 020-inch slotted screen installed from approximately 15 to 35 feet bsg and with blank casing extended to the surface A California state-licensed survey engineer from Baumbach and Piazza,lnc surveyed areference point on the top ofwells MW-3,MW-6,MW-7,MW-8AB through MW-12AB and EX-1 to the nearest 0 01-foot relative to a City of Stockton Bench Mark On 15 December 2004 a 118 foot soil boring was advanced at the site and completed as monitoring well MW-13 The well was completed as ground water monitoring well using two-inch diameter PVC casing with 0 020-inch slotted screen The well was screened from 113 to 118 feet bsg with blank casing extending to the surface A California state-licensed survey engineer from Morrow Surveying surveyed a reference point on the top of wells MW-3,MW-6,MW-7,MW-8A/B.through MW-12AB,MW-13 and EX-1 to the nearest 0 01-foot relative to a local bench mark I • On 22 and 23 October 2002 monitoring wells MW-1,MW-2 and MW-4 were destroyed by utilizing hollow stem augers to drill out wells MW-1, MW-2 and MW-4 to the wells total depths Subsequently,each borehole was completely backfilled with a portland cement grout mixture to one to two feet below surface grade and the remaining areas were backfilled to surface with neat cement Between March 1992 and October 1999, seven ground water monitoring events were performed at the site, ground water monitoring has been conducted quarterly since November 2000 I Advanced GeoEnvironmental,Inc