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GROUNDWATER 000TECHNOLOGY, INC. 1401 Halvard Drive,Suite 140,West Sacramento,CA 95691,(916)3724700 FAX(916)372-8781 June 10, 1991 Project No. 02320 1363 Mr. Van Hartnitt J U L Greyhound Lines, Inc. ENVIRONMENTAL HEALTH 901 Main Street, Suite 2425 PERMIT/SERVICES Dallas, TX 75202 RECEIVED RE: SOIL SAMPLE COLLECTION JUN GREYHOUND LINES TERMINAL FACILITY 121 SOUTH CENTER STREET MMONMEWAL DEM, STOCKTON, CALIFORNIA Dear Mr. Hartnitt: This report is presented by Groundwater Technology, Inc. to document the results of field and analytical services conducted at the above-referenced site on May 13, 1991 (Figure 1, Attachment A). The work included the collection of soil samples during the excavation of an underground diesel-fuel storage tank and subsequent submittal of the samples for laboratory analysis. On May 13, 1991 a Groundwater Technology field geologist collected soil samples during the excavation and removal of one 12,000-gallon diesel storage tank and associated piping (Figure 2, Attachment A). Tankpit samples (T-1 through T-3) were collected from the excavated tank pit at an approximate depth of 14-feet using an excavator bucket. Additional samples were collected at twenty-foot intervals along the product-line pipe laterals (P-1 through P-5) at depths of approximately 2-feet below grade using a hand- driven impact sampler equipped with 2-inch diameter by 6-inch long brass sample tubes. All soil sample locations were approved by an on-site representative of the San Joaquin County Public Health Services Department. After each sample was collected, it was field screened for volatile hydrocarbons using a portable Photoionization Detector(PID). No detectable levels of volatile hydrocarbons were encountered during field screening with the PID. After screening, each sample tube was sealed with foil and protective caps, labeled, and preserved on ice. The samples were then submitted under chain-of-custody manifest to GTEL Environmental Laboratories (GTEL) for subsequent analysis. The results of the laboratory analyses are presented in Table 1 (Attachment B). The corresponding laboratory reports and chain-of-custody manifests are presented in Attachment C. Each sample was analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX) by modified EPA Method 5030/8020, and for total petroleum hydrocarbons as diesel (TPH-D) by modified EPA method 3550/8015. Detectable concentrations of TPH-D were observed in samples T-1, P-3, P-4, and P-5 at concentrations ranging from 4,200 to 11,000 parts per million (ppm). Low concentrations of BTEX were detected in most samples ranging from 0.01 ppm in T-1 to 2.0 ppm in P-3. No BTEX constituents were detected in samples P-1 and T-3. Offices throWhout the U.S.,Canoda and Overseas