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ARCADIS GERAGHTY&MILLER 4. INVESTIGATION METHODS 4.1 PERMITTING A well permit application was submitted and approved by the San Joaquin County ' Public Health Services,Environmental Health Division(PHS/EHD) A copy of the wellpermit is located in Appendix B In addition, an Encroachment Permit application was subnutted and ' approved by the City of Stockton Public Works Department for the installation of well NP-2 in the City of Stockton right-of-way A copy of the encroachment permit is also located in Appendix B Prior to installing groundwater monitoring wells NP-1 and NP-2, ARCADIS ' Geraghty & Nrller notified Underground Services Alert (USA) to confirm the presence or absence of underground utilities near the boring locations In addition, each borehole was hand-angered to approximately four feet below ground surface (bgs) to clear the location for unmarked lines or utilities ' 4.2 DRILLING AND SAMPLING ' 4 2 1 Monitoring Well Drilling and Installation Hollow-Stem Auger Method ' Drilling for wells NP-1 and NP-2 proceeded from ground surface to depths of ' approximately 119 and 123 ft bgs, respectively, using 8-inch, outside diameter, hollow-stem augers The SJCPHS had a representative in daily attendance during the drilling activities Soil ' samples were initially collected at 5-foot intervals using a split-spoon sampler until a depth of 50 feet bgs and then continuously until the total boring depth was reached The soil sampler ' was driven into the soil ahead of the augers providing a relatively slough-free 18-inch soil sample contained in 3 six-inch brass or stainless steel tubes The bottom sample tube was ' retailed for possible laboratory analysis by placing plastic end caps over the ends of the brass tubes, labeling it, and submitting the sample to the on-site mobile laboratory for possible analysis The sample in the middle and upper brass tubes was used to evaluate soil ' 13