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29 June 1999 <br /> • AGE-NC Project No 97-0290 <br /> I <br /> Page 2of7 <br /> depth of 25 feet bsg in boring MW8, using a 140-pound hammer to advance the sampler 18 inches <br /> The number of blows required to advance the sampler in 6-inch increments was recorded on the <br /> boring logs <br />' All sampling tools and sample liners used for sample collection were thoroughly rinsed with clean <br /> water after washing with a solution of Alconox between each sampling run to avoid cross- <br /> contamination For each sample, both ends of the leading sleeve were covered with Teflon sheets, <br /> capped and sealed with tape The samples were labeled,stored on ace and transported under chain-of- <br /> custody to Alpha Analytical Laboratories,Inc (AAL) in Ukiah, a California Department of Health <br />' Services (DHS)-certified analytical laboratory <br /> I22 LOGGING <br /> Soil was extruded from a second brass sleeve and screened for the presence of organic vapor using <br />' an organic vapor meter equipped with a photo-ionization detector (PID Thermo Environmental <br /> 580A, 10 0 eV,calibrated to isobutylene),and the readings were recorded on the boring log The soil <br /> was then visually descnbed in accordance with the Unified Soil Classification System(see Appendix <br /> A- Boring Logs) <br /> 23 WELL AND BORING COMPLETION <br />' Boring MWS was completed as a ground water monitoring well using two-inch diameter PVC casing <br /> with 0 020-inch slotted screen installed from 60 feet to 40 feet bsg with blank casing extended to the <br /> surface The filter pack(No 3 Lonestar sand) was installed from 60 feet to approximately 38 feet <br />' bsg A nominal 3-foot bentonite pellet plug was then installed above the filter pack and hydrated <br /> The well was then grouted to near the surface with portland cement <br />' Boring VWl was completed with a screened interval installed from 60 to 42 feet bsg with blank <br /> casing extending to the surface The filter pack was installed from 60 to 41 feet bsg A bentomte plug <br />' was installed from 41 to 37 5 feet and hydrated in two foot lifts A second well casing was installed <br /> with a screened interval from 37 to 29 feet bsg and a falter pack from 37 5 to 28 feet bsg A bentonite <br /> plug was installed from 28 to 24 5 feet A third casing was installed with a screened interval from <br />' 24 to 14 feet bsg and the filter pack from 24 5 to 13 feet bsg A bentonite plug was installed from <br /> 13 to 11 feet bsg The well was then grouted to near the surface with portland cement <br />' Borings SWI and SW2 were completed as sparging wells with screened intervals from 60 to 57 5 <br /> . feet bsg and blank casing extending to the surface The filter pack was installed from 60 to <br /> approximately 55 to 56 feet bsg A bentonite plug was installed above the filter pack to a depth of <br /> Advanced GeoEnvironmental,Inc <br />