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Manteca Unified School District <br /> ' 2901 E. Louise Ave, Lathrop, California <br /> Remedial Excavation Report Page• 4 <br /> 6.0 Conclusions and Recommendations <br /> ' A contamination plume exists from approximately 12 5 feet below ground level down to and <br /> into the groundwater at 16 feet below ground level This plume migrated to the north and west <br /> of the original tank removal site The remedial excavation attempt was not complete because of <br /> budget restraints, and the contamination extended into the water table at least to 23 feet <br /> Figures 3, 6 & 7 show the known residual soil and groundwater contamination <br /> The residual contamination will require additional borings to define the soil and groundwater <br /> contamination plume limits S6me of these borings can be completed as soil gas extraction <br /> wells to provide remediation of the remaining soil contamination, and some borings can be <br /> i ' completed as monitoring wells to determine the groundwater gradient and/or remediation <br /> wells A minimum of three properly spaced monitoring wells are needed for gradient <br /> calculations <br /> ' The above represents our best professional opinion as to environmental conditions at this Site <br /> These opinions were derived using data at hand, and using standards of care common to the <br /> ' environmental consulting community in Northern California Additional work or sampling at <br /> this site may generate data that could lead to a change of opinion regarding site conditions or <br /> appropriate site remediation procedures, or both <br /> Prepared by ���Q ��1.Ltlp �N� <br /> No 02151 A <br /> Mchael 1 Kloberd REA,REHS <br /> ERQtf03 � 'F� <br /> California Registered Environmental Ass r#02157 <br /> California Registered Environmental Health Specialist#4783 n►�, <br /> 0 <br /> 4613 <br /> •,,.....».,_. ,fit <br /> ' Louis Smith, CPG <br /> Certif ed Professio Geologist#4613 , <br /> ES51c�, <br /> end <br /> �' `� No <br /> 22 339 m <br /> Lee Delano,P E # 2339 6 EXP 93093 ix <br /> California Registered Civil Engineer spy c+vs►. <br />