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I <br /> 13 May 2003 <br /> . AGE-NC Project No 95-0173 <br /> Page 5 of 6 <br /> 3 7 WELL ELEVATION SURVEY <br /> On 22 November 2002,a state of California state-licensed survey engineer from Baumbach&Piazza <br /> Engineering, Inc surveyed a reference point on the top of MW-13 well casings at the site to the <br /> nearest 0 01-foot relative to City of Stockton Bench Mark No 25, located near the site The results <br /> of the monitoring well survey are contained in Table 1 The surveying report (Baumbach &Piazza <br /> Job No 9797) is presented in Appendix D <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The results of the October, November and December 2002 multi-level well installation are as <br />' follows <br /> • No soil samples were collected during installation of multi-level well MW 13 (A-B) Cross <br />' sectional view C-C'was generated from previous investigation and depicts general lithology <br /> beneath the site in cross sectional view (Figure 3) Generally, less permeable, sandy, silty <br /> clay and clayey silt is apparent at the site at depths between 75 feet to 95 feet bsg, 100 feet <br /> I . to 112 feet bsg and 128 feet to 134 feet bsg (HU4, HU6 and HU8, respectively) Semi to <br /> more permeable lithology consisting of poorly to well graded, unconsolidated, silty, fine to <br /> coarse-grained sand was observed at all other depths <br /> I • AGE installed three screen intervals at multi-level well MW-13 (A-C),at a depth of between <br /> 95 and 100 feet bsg to continue the assessment of Hydrologic Unit S, and at depths of <br /> I between 120 and 125 feet bsg and between 145 and 150 feet bsg to assess the sand layers <br /> encountered in Hydrologic Units 7 and 9, respectively The wells were developed on <br /> 05 November 2002 and surveyed on 22 November 2002 Monitoring well details are <br />' summarized in Table 1 and depicted in Figure 5 <br /> I5.0. RECOMMENDATIONS <br /> With the addition of multi-level well MW-13 (A-C),AGE recommends continued quarterly ground <br /> water monitoring at the site <br /> 6.0. LIMITATIONS <br /> I Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities Evaluation of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this investigation was made from previous site <br /> Advanced GeoEnviron mental,Inc <br /> I <br />