SITE INFORMATION AND CORRESPONDENCE

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NOW wHF WHF Environmental Consultants, Inc. Post Office Box 6729 Modesto, CA 95355-6729 (209) 579-8138 9 June 1992 Laurie A. Cotulla, REHS, Program Manager Environmental Health Division San Joaquin County Public Health Services PO Box 2009 Stockton CA 95201 SUBJECT: Blockbuster Video/Yellow Submarine 140 W. Harding Way, Stockton, CA Dear Ms. Cotulla: This letter is written in response to your undated letter, which was received in our office on May 13, 1992, regarding the Phase II Remedial Investigation Results Addendum, dated April 2, 1992. Enclosed, for your review, is the revised Figure 4 from the above referenced report, as you requested. Please note that the dots shown on the plan portion of the figure represent points on the surface of the ground below which grab samples were taken in the excavations and not borehole collars as indicated in the original Figure 4. The sample points are indicated by "X" symbols on the section portion of the figure. Each point is labeled with the surface reference point and the vertical depth below that point, except in the case of point 13D where the samples were taken along the sloping southern end of the trench and the depths were measured along the slope, rather than vertically. Sample RE#1-22' was a grab sample taken from the bottom of the re-excavation and represented what appeared to be the most contaminated area of plume at the bottom of the excavation. At that depth (22 feet), the contamination plume measured two by two feet in cross section, which was a fourfold reduction from its cross sectional area just four feet shallower. At a depth of 18 feet, the plume had measured four by four feet in cross section. Chain of Custody and laboratory data sheets supporting the analyses reported on the revised Figure 4 are attached to this letter for your review.