ARCHIVED REPORTS_XR0009061 - Laserfiche WebLink

Home Browse Search

1 Union Ice Company, 425 North Union Street, Stockton, California Phase II Revised Site Assessment, Installation of Oct 28, 1993 Monitoring Wells and Quarterly Groundwater Report Page 3 All water-bearing zones and the depths at which they were encountered were noted on theselogs The cuttings from the drilling operation will be containerized on-site during drilling for proper disposition The proper method of disposal will be dependent upon results of laboratory analysis This disposal will be the responsibility of the client unless other ✓ arrangements have been made 3.2 Well Construction All materials used in well construction were thoroughly cleaned prior to introduction into the boring A 2-inch diameter well casing (PVC) with an end cap and factory perforations for placement in the saturated zone was placed in the boring The screen and filter pack sizes, as well as any well construction details, are noted on the Boring Log header for each well (Appendix F) The casing and end caps were threaded or joined by stainless steel screws, no PVC cement was used The filter pack extends two feet above the perforated zone A bentonite clay seal, 2 to 3-feet thick, was placed in the annular space above the filter pack followed by a cement grout to the surface 3.3 Well Development and Sampling The wells were developed until the well water appeared clear of sediment, or until an appropriate number of well volumes (based upon the judgment of the responsible professional) had been evacuated The water produced during well development was containenzed and left on-site in 55-gallon drums for disposal as hazardous waste if deemed necessary upon receipt of laboratory results Disposal will be the responsibility of the client unless other arrangements have been made The wells were allowed to stabilize for twenty-four (24) hours prior to sampling All soil and groundwater samples were properly labeled with date collected, project name/number, sample coordinator and sample identification Field records document the above information and other significant data, such as, names of on-site personnel, sampling methods, date and time of sampling, the number of well volumes removed before sampling, preservatives added (if any) and any filtration performed on samples (Appendix I) The samples were refrigerated immediately for delivery to the laboratory and were under no circumstances opened by anyone other than laboratory personnel Chain-of- Custody hain-ofCustody records were maintained at all times (Appendices A- E)