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Project No 58080-06-02 <br /> May 5, 1995 <br />' a California registered engineer utilizing the Unified Soil Classification System Copies of all <br /> previous and current boring logs are included in Appendix A The sample tubes were capped, <br /> labeled and chilled pending transport to an analytical laboratory The soil samples were field <br /> screened with a photo-ionization detector (PID) to assess possible qualitative indicators of volatile <br />' organic compounds <br />' Quality assurance/quality control procedures were provided during the field exploration activities <br /> These procedures included cleansing/rinsing of the sampling equipment and steam cleaning augers <br /> prior to and between borings Cleansing/rinsing of the sampling equipment was performed prior <br /> to the collection of each soil sample by washing the equipment with a trisodium phosphate solution <br />' followed by subsequent tap water and deionized water rinses <br /> Soil samples were delivered to Sequoia Analytical, a California certified analytical laboratory, <br /> following standard chain-of-custody procedures <br />' 24 Groundwater Monitoring Well Construction <br />' Offsite groundwater monitoring wells MW-4 and MW-5 were constructed in the adjacent public <br /> right-of ways at the locations depicted on Figure 2 The wells were installed to depths of <br /> approximately 70 feet bgs The monitoring wells were constructed using 2-inch diameter Schedule <br /> 40 polyvinyl chloride (PVC) casing The lower portion of the wells were constructed using 20 feet <br />' of 0 020-inch slotted screen FVC casing placed between the approximate depths of 50 - 70 feet bgs <br />' A filter pack consisting of No 3 Monterey sand was tremmied around the„screen from the bottom <br /> of the boring to an elevation of two feet above the screen zone A two foot thick seal consisting <br />' of hydrated bentonite chips was placed above the filter pack Above the seal a mixture of bentonite <br /> powder and cement was placed to within two feet of grade level Traffic-rated security wellhead <br /> covers were used to complete construction <br /> -1 l- <br /> 1 <br />