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�= Geologycal Audit Services, ln�. <br /> Environmental Pr f j <br /> — W�� o essionalstA!_T!! <br /> M_ 1803 W.March Lane,SuiteA•Stockton,CA 95207956-0264 9 �56-0�264F FAX(209)956-0700 <br /> yy & r I8, 1993 <br /> (GeoAudit-1. 61) <br /> Ms. Mary Meays <br /> San Joaquin County PHS/EHD <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Excavation Soil Samples - Mid-Cal Leasing <br /> 1649 East Channel Street, Stockton, California <br /> Dear Ms. Meays: <br /> Enclosed are the laboratory reports for the soil samples collected <br /> during excavation procedures at the referenced site. The samples <br /> were collected in clean 2-inch by 3-inch brass tubes. The sample <br /> locations were chosen at your direction. <br /> All samples were transported in a chilled container, under chain- <br /> of-custody to Sparger Technology, Inc. (STI) and were analyzed for <br /> total petroleum hydrocarbons (TPH as gasoline) and volatile <br /> aromatics (BTE&X) in accordance with EPA methods 8015m and 8020, <br /> respectively. <br /> The initial soil samples were collected on August 31, 1993 . Ten <br /> (10) soil samples were collected from the sidewalls and floor of <br /> the excavation. Contamination was detected in samples from the west <br /> wall and floor of the excavation. The laboratory results are <br /> detailed in STI 's report dated September 10, 1993 . <br /> After further excavation of the floor and west wall of the <br /> excavation removed additional contaminated soil, confirming soil <br /> samples were collected on September 21, 1993 . Two soil samples were <br /> collected from the floor and three were collected from the west <br /> sidewall of the excavation. <br /> The confirming samples indicate that soil contamination was <br /> successfully removed from the site. only one sample, B5-39, <br /> collected from a depth of 39 feet, had any detectable contamination <br /> Benzene was detected at 0. 006 gg/g (ppm) and toluene was detected <br /> at 0. 007 ppm. However, these concentrations are just above <br /> detection limits of 0. 005 ppm and should not pose a significant <br /> health risk. We estimate that less than 10 to 20 cubic yards of <br /> contaminated soil remains at the site and this soil probably has an <br /> average benzene/toluene concentration of 0.005 or less. <br /> A complete report detailing the excavation procedures and sample <br /> results is currently being prepared and will be included in a <br /> quarterly report to be submitted to the PHS/EHD. <br /> 1 q5'q0` <br /> Full Spectrum Environmental Services•Hydrogeology <br />