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07 March 2008
<br />AGE -NC Project No. 07-1569
<br />Page 2 of 4
<br />On 12 December 2007 twenty-six potholes were excavated in the estimated outlying area of the
<br />former glass disposal site (Appendix A). Based on historical information, Wong Engineers, Inc.
<br />estimated the area of the former glass disposal site to be approximately 6.7 acres (Recommendation
<br />For Locating Existing Glass Disposal Site, dated 14 August 2007, prepared by Wong Engineers,
<br />Inc.). The potholes were excavated, utilizing an excavator, to depths between 3.5 and 8.5 feet below
<br />surface grade (bsg).
<br />The potholes were excavated until either AGE or EHD observed the presence of glass in the soil.
<br />Glass was observed in eighteen ofthe twenty six potholes (2610,2800A, 2801, 2801A, 2801B, 2802,
<br />2802A, 2802B, 2803, 2804, 2805, 2805A, 2805B, 2806, 2810, 2810A, and 2813) at depths between
<br />3.5 feet and 6.5 feet bsg. The edge of the glass disposal area was defined by potholes 2610, 2800B,
<br />2803A, 2804A, 2810A, 2813A, 2813B, and 2814 (Appendix A). The actual area of the glass disposal
<br />site was determined to be approximately 180,500 square feet. Wong Engineers, Inc surveyed the area
<br />of the glass disposal site on 13 December 2007. A topographic map showing the actual glass disposal
<br />area is included in Appendix A.
<br />A fine, loose unidentified white material was encountered in areas where glass was present in the
<br />soil. Additionally, other debris such as wood, metal, or plastic was encountered in some of the areas
<br />where glass was present in the soil, and a red or pink discoloration was observed in the glass and soil
<br />encountered in potholes 2802, 2805, 2806, and 2800B.
<br />Soil and waste debris that appeared to be discolored was screened for the presence of organic vapor
<br />using an organic vapor meter (OVM) equipped with a photo -ionization detector (PID: Thermo
<br />Environmental 580 A, 1OeV, calibrated to isobutylene).
<br />Soil samples were collected from six of the twenty six potholes, as directed by EHD, from depths
<br />between 3.5 feet and 7 feet bsg. Soil samples were collected from the bucket of the excavating
<br />equipment with a stainless steel trowel into a 3 -inch by 2 -inch stainless steel sleeve. Before
<br />collection, one end of the sleeve was covered with a teflon sheet, capped and sealed with tape. Upon
<br />collection, the other end of the sleeve is covered with a teflon sheet, capped and sealed with tape.
<br />Each sample was properly labeled and placed in a chilled container under ice. The samples were
<br />subsequently transported under chain of custody to Cal Tech Environmental Laboratory (CTEL), A
<br />State of California Department of Public Health -certified laboratory, and analyzed for the following:
<br />Advanced GeoEnvironmental, Inc.
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