Laserfiche WebLink
1.0 INTRODUCTION <br /> On behalf of the County of San Joaquin (property owner), Ramage Environmental has prepared <br /> this Groundwater Monitoring Report, First Quarter 2006 for submittal to the San Joaquin County <br /> Environmental Health Division (EHD) and the Central Valley Regional Water Quality Control <br /> Board (RWQCB). The scope of work was completed according to Ramage Environmental's Site <br /> Conceptual Model and Work Plan, Additional Site Investigation and Remedial Feasibility Testing, <br /> dated March 7, 2003. On July 14, 2003, EHD approved the work plan. <br /> 1.1 Site Location and Description <br /> The subject property is located at 1810 East Hazelton Avenue in the city of Stockton, California <br /> (Figure 1). The site is an active county motor pool and office complex with a gasoline and diesel <br /> fueling system. Currently, the fueling system consists of one gasoline underground storage tank <br /> (UST#1), one diesel tank (UST#2), and two dispenser islands. Additionally, four former tanks <br /> (USTs# 3, 4, 6, and 7) were removed, and one former tank (UST#8) was abandoned in place. <br /> The former and current fueling systems are shown on Figure 2. A municipal irrigation well is <br /> located in Stribley Park, approximately 600 feet north of the fueling system (Figure 3). <br /> 1.2 Previous Work Summary <br /> Prior to 1979, two of the tanks (USTs #6 and #7) were removed from the site. <br /> On June 15, 1995, Fisch Environmental removed a 12,000-gallon gasoline tank (UST#3) from the <br /> area immediately west of the dispenser islands, and collected soil samples for laboratory analysis <br /> from beneath the former UST. On June 29, 1995, based on the soil sample results, Fisch <br /> Environmental over-excavated the tank basin to a depth of approximately 27 feet and collected <br /> additional soil samples. The over-excavation soil samples also contained elevated concentrations <br /> of Total Petroleum Hydrocarbons (TPH)-as-gasoline, and benzene, toluene, ethylbenzene and <br /> xylenes (BTEX). The soil sample locations are shown on Figure 2. <br /> During November 1998, the county public works department replaced USTs #1 and #2 with <br /> upgraded systems. Advanced GeoEnvironmental collected soil samples from beneath the USTs <br /> and underground product piping. These soil sample locations are also shown on Figure 2. <br /> 3 <br />