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I FULLER MOBILE HOME PARK 365 East Louise, Lathrop, California Phase I Remedial Report 1.0 PROJECT IDENTIFICATION This project has been developed to investigate a former underground storage tank facility at the Fuller Mobile Home Park located at 365 East Louise Avenue in Lathrop, California (Figure 1) The phase T work explored the extent of gasoline, diesel fuel, Benzene, Toluene, Xylenes, and Ethyl Benzene (BTX&E) released to the subsurface in the vicinity of the former underground storage tanks 1.1 Site Description & History On September 7, 1990, SEMCO, under permit, removed Fuliei Mobile Home Park's fuel facility, which consisted of two (2) underground storage tanks, a 550 gallon diesel tank and a 1,000 gallon gasoline tank Soil sample3 taken under the tanks disclosed concentrations of gasoline, diesel, and BTX&L The City of Lathrop has required Fuller Mobile Home Park to in%mlt storm water retention ponds and one of the ponds will encompass the formes tank excavation The pond will be approximately 60 feet wide by 160 long Con- struction of the pond will involve removing all of the backfill material as well as some or all of the contaminated soils beneath the former tanks (Figure 2) 2.0 SCOPE OF WORK IOn March 31 and April l 1,1992, WHF Environmental Consultants drilled four (4) soil I borings in the vicinity of the former underground tanks and obtained groundwater samples from the borings through a stainless steel well casing slotted five feet (5) from the bottom The borings were to surround the former excavation to the north, south, west and east After drilling the first boring (B-1) 14 feet from the center of the exca- vation to the west and finding petroleum saturated soils and groundwater, we decided to omit the east boring which, due to the location of the property line, would have placed it within the former excavation, an area of known contamination The fourth bonng, B- 4, was instead placed 10 feet west of B-1 to help define the limits of contamination in the soil Boring B-2 was placed to the north about 31 feet from the center of the former excavation and boring B-3 was located to the south about 33 feet from the center of the former excavation (Figure 3)