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n <br /> Sunboro Development Corporation <br /> Subsurface Soil Investigation <br /> Corral Hollow/Byron Roads <br /> Tracy, California <br /> October 1988 <br /> F1. SUMMARY <br /> The work performed in the field and laboratory has provided <br /> information about the Sunboro Development Corporation property, <br /> located south of Byron Road and west of Corral Hollow Road in <br /> Tracy, California that should lead to favorable conclusions by <br /> governmental regulatory agencies to allow Sunboro Development, <br /> Corporation to proceed with subdivision development on Parcel <br /> A. (APN 237-170-45) Nine (9) soil borings spaced. at 200{ foot <br /> intervals were drilled to depths of 23± feet and soil samples <br /> were taken to depths of 25± feet. Soil profile logs were developed <br /> from field specimens (see appendix A). Visual and olfactory <br /> investigation indicated that no contamination had occurred in <br /> any of the nine (9) soil borings. Laboratory analysis confirmed <br /> the field observations and inspections of the soil borings. <br /> The soil borings were made under a pe�mit issued by the San Joaquin <br /> ►., Local Health District, Stockton, California. Drilling and <br /> backfilling of bore holes was done by North Valley Drilling, <br /> Company, Lodi , California. Laboratorly analysis was made by Eureka <br /> Laboratories, Sacramento, California; a California Certified <br /> laboratory. <br /> Terrestrial Technology, Inc. was the engineering firm that <br /> coordinated the work of others and prepared and . del ivered the <br /> soil samples to Eureka Laboratories. Mr. L. A. Moldenhauer, <br /> L.S. , P.E. , a civil engineer licensed in the state of California <br /> (C-17381) , supervised the field work and soil inspection and <br /> classification. Laboratory results (see Appendix B) indicate <br /> the analysis run and procedure for each test. <br /> The soil borings were backfilled and sealed as per requirements <br /> 9 p q <br /> of the San Joaquin Local Health District. The District's staff <br /> witnessed the sealing of the soil boriings. <br /> The soils, as shown on the Soil Boring Profile, range from clays <br /> and silts to thin stratas of sand and sandy gravel . The <br /> Fit groundwater surface was encountered �t six (6) to eight (8) feet <br /> below the ground surface (elevation 30 to 37 feet above average <br /> mean sea level ). After drilling, the ground water rose to four <br /> (4) to five (5) feet below the ground surface (elevation 32' <br /> to 33' A.M.S.L. ) <br /> The source of petroleum hydrocarbon contamination is believed <br /> I-1 <br />