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Union Ice Company, 425 North Union Street, Stockton, California Phase II Additional Site Assessment, Installation of Sept 9, 1993 Monitoring Wells and Quarterly Groundwater Report Page. 3 1 ' pertinent soil or bedrock characteristics, and any evidence of contamination were noted All water-bearing zones and the depths at which they were encountered were noted on these logs The cuttings from the drilling operation will be containerized on-site during g drillin 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 tAll 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 I 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 r professional) had been evacuated The water produced during well development was 1 containerized 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 namelnumber, 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 Cham-of- Custody records were maintained at all tunes (Appendices A-E)