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WHSTERN GEO1. QC [ C Rf so " CFS , INC . ALI 2 on 30 August 1989 and 5 September inch 19$9,respectively, BB Boring B-3 and -4 w ere completed as 2- monitor wells MW-3 and MW-4 on 26 and 27 September 1989,respectively. The screened interval Far well MW-I is between 46.6 f?and 66.5 ft below between 5225 h and 6725 h below grade. The screened interval forcreenwell Md interval for well _W-3 is between 4625 ft and 65.25 ft below grade. The screened interval for well MW-4 is between 55 ft and 68S it below Well construction details For the four wells are included on the burin 1 grade. screens were terminated between 6 ft and 18 ft above static water levels too ow four Appendix possible The well fluctuations poss seasonal Monitor weU MW-1 was initially developed on 31 August 1989 by WGRgeologist R' �r Baldwin using a combination of bailing and water injection techniques. A r Richns ard groundwater and injected water were removed from the well. Moderate amounts of salt were ptely 12 r s nt in the groundwater at the end of the development process. Monitor wells MW-1 and MW 2 present developed by WGR technicians Beverly Baldwin and Mike Parkinson on 6 September i98and well weer 1 was developed using a combination of bailing,surge block and water injection injection techniques. A total of -„� 19.5 gallons of groundwater and injected water were removed from the well,with pumping rates ranging from about 0.3 gallons-per-minutes(gpm)to about 17.6 gpm• Well MW-2 was developed using bailing, surge block- pumping techniques and a total of 55 gallons of groundwater were removed from the well at an average pumping rate of about 1.7 gpm eaviroamental . Wells MW-3 and MW-4 were developed by WGR technicians Madeleine Stanger and Randy Smith using surge block and bailing techniques on 28 September 1989. A total of 17 gallons of groundwater were removed from the wells at { rates averaging 0.14 pumping gpm. All development water was temporarily stored on-site in 55-gallon drums - pending laboratory analysis. 3.3 GROUNDWATER SAMPLING Water samples were collected from well MW-1 on 31 August 1989 by WGR staff. These samples were collected at [he end of an incomplete development process and are probably not 2completely�_ representative of groundwater conditions beneath the site. Water samples were collected from wells M111-1 and MW 2 an 7 Seplember 1989 and from wells MW-1 thou 4 on 29 September 1989 by WGR staff, according to the WGR standard operating procedure included as Appendix D. A minimum of three well-casing volumes were purged with steam-cleaned PVC bailers prior to sampling. The groundwater samples and travel blanks, made up of deionized water at the laboratory,were sent under chain-of=custody to CCA bEPA Method 8240. S of Napa or CCAS of San Luis Obispo for analysis y 066RIN09 4