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California/Western Region: 4138 Lakeside Drive RIEDEL ENVIRONMENTAL Richmond, California 94e06 n n (510) 222-7810 SERVICES INC. FAX: (510) 222-6868 18 October 1994 Ms. Margaret Pitts Senior Engineer Strint Communications Company 901 East 104th Street Kansas City, MO 64131 Re: Pipeline Trench Sampling, Sprint Stockton Switch Facility 3807 Coronado Avenue, Stockton, California RES Project 4185 Dear Ms. Pitts: Riedel Environmental Services, Inc. (RES) has prepared this letter detailing the additional soil sampling at the Sprint Communications Company Stockton Switch Facility located at 3807 Coronado Avenue in Stockton, California. As required by San Joaquin County Public Health Services (SJCPHS), a sample of the native soil beneath the abandoned pipeline trench of the previously existing 6000-gallon UST was obtained and analyzed. This letter is provided as an addendum to the RES' Soil Investigation report dated 7 October 1994. Pipeline Trench Sampling On 13 October 1994, RES manually advanced a single borehole through the bottom of the abandoned pipeline trench using hand auger equipment. Fill soils were encountered to a depth of approximately 4 feet below the ground surface. Trench backfill gravel was encountered from approximately 4 to 5 feet below the ground surface. Native soil, consisting of yellow-brown, moist silt with fine sand, was encountered at the bottom of the pipeline trench at a depth of approximately 5 feet below the ground surface. The location of the hand auger borehole HBI is shown on the attached Figure. A sample of the native soil at a depth of approximately 6.6 feet below ground surface (1.5 feet below the bottom the abandoned pipeline trench) was obtained using a manually operated hammer sampling device containing a 2-inch diameter by 6-inch long brass tube. Upon removal from the sampling device, the ends of the sample tube were sealed with Teflon film, plastic end caps, and tape. The sample was then labeled (HBl-D6.6), logged onto a chain-of-custody record, and placed in a cooler containing blue ice for transport to a State of California certified testing laboratory. Ms. Diane Hinson and Mr. Eric Trevena of the SJCPHS witnessed the soil sampling. At the completion of the field sampling on 13 October 1994, the soil sample was transported to Superior Analytical Laboratory located in Martinez, California. Chain-of-custody documentation accompanied the sample from time of acquisition until delivery to the laboratory. The sample 4185�CBW4WRINT.ADD%180Cr96 24-Hour Hotline 1 (800) 334.0004 A SL�:S :ary = -'e' Envlrormer,a -==--clog es Ir.: