ARCHIVED REPORTS XR0012547 - Laserfiche WebLink

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Regional Water Quality Control Board June 23, 1988 Woodward-Clyde Cam.taltants I Page 2 I Consultant Contact: Mr. Michael Bonkowski Mr. George Ford Woodyard-Clyde Consultants 500 12th Street, Suite 1.0 - Oakland, CA 94607 2} location bia See Attachment 1 •.a 3) Site sketch showin nearb streets andro erties: See Attachment 1 4} La out of tanks and i in .systems, labeled for content: See Attachment 2 5) Results of tank tests or initial site work done: Based on our telephone conversation with CALTRANS Shop Foreman Lee Elson; the leaking tank (number 3) was closed off about 10 years ago. He also said that all the tanks have been taken out of service as of January, 1988, although they are still in the ground. 6) Estimate of lluid leaked into the environment: No inventory Y records are presently available for tank number 3, so no accurate estimate of the amount of fuel lost can be made. 7) Local Tovogr„aphy: Toe land surface near CALTRANS Shop 10 is generally leve . Based on the V.S. Geological Survey's published Stockton East and Stockton West 7.5 minute quadrangles, the ground surface at Shop 10 occurs at elevation 23 feet, based on the 1929 NGVD. Geolo : The Shop 10 site is underlain by unconsolidated alluvial deposits of Recent age. The near-surface deposits consist primarily of silty clay, clayey silt, and sand. Nearb 5�treams: The tanks and fueling station are located approximately 1200 feet south of Mormon Slough, a tributary of the Stockton Deep Water Ship Channel and the San Joaquin River. The site is about 1.2 miles north of Duck Creek, also a tributary of the San Joaquin River. Depth to Groundwater: Based on measurements made in September, 1987 in the shallow monitoring wells installed at the site, groundwater occurs at a depth of about 42 feet below ground surface. 8) 1ci al and irri ation we11s: Attached is a list of all water wells on file with the Department of water