ARCHIVED REPORTS_XR0003512 - Laserfiche WebLink

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. 1 0 INTRODUCTION On behalf of the County of San Joaquin (property owner), Ramage Environmental has prepared this Groundwater Monitoring Report, Second Quarter 2003 for submittal to the San Joaquin County Environmental Health Division (EHD) and the Central Valley Regional Water Quality Control Board (RWQCB) 11 Site Location and Description The subject property is located at 1810 East Hazelton Avenue in the city of Stockton, California (Figure 1) The site is an active county motor pool and office complex with a gasoline and diesel fueling system Currently, the fueling system consists of one gasoline underground storage tank (UST#1), one diesel tank (UST#2), and two dispenser islands (Figure 2) Additionally, four ' former tanks (USTs# 3, 4, 6, and 7) were removed, and one former tank (UST#8) was abandoned in place A municipal irrigation well is located in Stribley Park, approximately 600 feet north of the fueling system The location of this municipal well is shown on Figure 3 12 Previous Work Summary Prior to 1979, two of the tanks (USTs#6 and #7) were removed from the site On June 15, 1995, Fisch Environmental removed a 12,000-gallon gasoline tank (UST#3) from the area immediately west of the dispenser islands, and collected soil samples for laboratory analysis from beneath the former UST On June 29, 1995, based on the soil sample results, Fisch Environmental over-excavated the tank basin to a depth of approximately 27 feet and collected additional soil samples The over-excavation soil samples also contained elevated concentrations of Total Petroleum Hydrocarbons (TPH)-as-gasoline, and benzene, toluene, ethylbenzene and xylenes (BTEX) The soil sample locations are shown on Figure 2 During November 1998, the county public works department replaced USTs #1 and #2 with upgraded systems Advanced GeoEnvironmental collected soil samples from beneath the USTs and underground product piping These soil sample locations are also shown on Figure 2 • 3