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f <br /> F1Subsurface Investigation, Well Installation, and Sample Analyses Results Page 6 <br /> Cintra Park Phase II Development, <br /> Tract 2705, Tracy, California <br /> F July 23, 1998 CTE Job No. 20-0445B <br /> • The lateral and vertical extent of hydrocarbon-affected soil onsite has generally been assessed <br /> and removed. Hydrocarbon-affected soil remaining onsite appears to be limited in extent. <br /> Although four sidewall and bottom soil samples contained TPH-G concentrations, these <br /> �, concentrations were 2.0 mg/kg or less. Additionally, field analytical results are interpreted <br /> to indicate hydrocarbon-affected soil at each of the detected locations is generally confined <br /> to areas of approximately five horizontally and less than two feet vertically. <br /> t . Groundwater, encountered at an approximate depth of eight fbg,has been slightly impacted <br /> by the petroleum hydrocarbons. However, no free product was detected at any time in the <br /> excavations. <br /> 4.0 SUMMARY OF RECENT ACTIVITIES <br /> Recent activities at the site consisted of excavation of slit borings, collection and analyses of soil <br /> samples, installation of groundwater monitoring wells, and collection and analyses of groundwater <br /> samples. A San Joaquin County, Public Health Services, Environmental Health Division <br /> (PHS/EHD) approved work plan dated December 8, 1997 guided the activities performed. A copy <br /> of this workplan is provided in Appendix D. These activities will be summarized in the following <br /> sections. <br /> i <br /> 4.1 Soil Borings and Soil Sample Collection <br /> F, Four soil borings(PMW-1, SB-1, PMW-3, and SB-3) were excavated on March 10-12, 1998, using <br /> Fa Mobile Drill model B-61 hollow-stem auger; the maximum depth explored was approximately 295 <br /> F <br /> C:ITEEL FILEs1CINTRA PARK\CENTRA7-13.DOC <br /> 1 <br />