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F <br /> AS S O C I ATE S I N C . <br /> SUMMARY REPORT FOR <br /> SUBSURFACE INVESTIGATION, <br /> ' INTERIM REMEDIATION,AND <br /> CORRECTIVE ACTION PLAN <br /> ' at <br /> D'ARCY PARKWAY- ROAD EXTENSION <br /> LATHROP,CALIFORNIA <br /> ' 1.0 INTRODUCTION <br /> This report summarizes procedures and practices utilized by ATC Associates Inc. to investigate <br /> ' the vertical and horizontal extent of impacted soil and groundwater in the vicinity of a surface spill <br /> and conduct interim remediation at the site located at the end of D'Arcy Parkway in Lathrop, <br /> ' California (Figure 1). The source of the surface spill and date of occurrence are unknown. The <br /> investigation consisted of excavating five test pits, excavating additional soil from one of the test <br /> pits, extracting groundwater from the excavation, drilling four soil borings, and collecting soil and <br /> groundwater samples for analysis. <br /> ' 1_1 Site Location <br /> The site is located on the end of D'Arcy Parkway in Lathrop, California, as shown on Figure 1. <br /> The location is an agricultural, commercial, and industrial area and the site is within the roadway <br /> ' extension at approximately the 400 or 500 block of D'Arcy Parkway. <br /> 1_2 Site Back round <br /> :.� In March 1998, during construction activities associated with the extension of D'Arcy Parkway, a <br /> suspected surface spill was discovered and construction activities were suspended pending <br /> ' investigation of the site. A soil sample was collected which indicated the presence of total <br /> petroleum hydrocarbons as diesel (TPHd). The site has been agricultural until the recent ongoing <br /> development began. There is no evidence that the diesel fuel was released from an underground <br /> storage tank. It is assumed that the source of the diesel fuel is related in some way to the fueling <br /> of construction equipment during grading. <br /> 1.3 Previous Work <br /> r On March 25, 1998, ATC Associates was retained to investigate the extent of the suspected <br /> surface spill. Five test pits were excavated by Stokley Construction (License A & B 4492743) in <br /> the vicinity of the suspected spill (Figure 2). No evidence of petroleum hydrocarbons was noted <br /> in the first four test pits to depths of approximately 12 feet below ground surface (bgs) and the <br /> w:W2541sumrptdm 1 <br /> 1 <br />