Laserfiche WebLink
AI RIA <br /> Well Materials• Wells S-5, S-6, and S-2-85 were constructed using 4-inch <br /> diameter, Schedule 40 PVC casing with a screen slot size of <br /> 0 020-inch and#2/12 Monterey sand <br /> Screened Interval Well S-5 is screened from 57 5 to 67 5 fbg, well S-6 is screened <br /> from 60 to 70 fbg, and S-2-85 is screened from 77 to 87 fbg <br /> Monitoring well construction details are presented on Table 1 <br /> and recorded on the exploratory boring logs <br /> Well Development/Sampling: Blaine developed andur ed the new wells on <br /> p g December 22, <br /> 2003 using surge block agitation and pump evacuation Blaine's <br /> well development report was included in our Groundwater <br /> Monitoring Report — Fourth Quarter 2003 issued on March 1, <br /> 2004 The newly installed wells have been added to the existing <br /> quarterly groundwater monitoring and sampling program already <br /> in place at this site The most recent groundwater monitoring <br /> • data for this site is included in Appendix D <br /> Wellhead Survey: Virgil Chavez Land Surveying of Vallejo, California surveyed <br /> the elevation and location of the new wells on January 15, 2004 <br /> This survey was performed to comply with the State of <br /> California Geotracker requirements The surveyor's report is <br /> included in Appendix E <br /> HYDROCARBON DISTRIBUTION IN SOIL <br /> Soil samples were only collected from borings SB-19 and SB-20 and analyzed for lead Soil <br /> samples were collected from depths of 40, 50, 60,and 70 fbg in both borings Lead was detected <br /> in onsite boring SB-19 at concentrations ranging from 2 5 to 5 6 milligrams per kilogram <br /> (mg/kg) Boring SB-20 was drilled offsite, south of the site, and contained lead at concentration <br /> ranging from 4 0 to 4 8 mg/kg <br /> The lead soil chemical analytical data are summarized in Table 2 Laboratory analytical reports <br /> are presented in Appendix F <br /> 0797 4 <br />