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• Results of Subsurface Investigation <br /> Colberg Boat Works <br /> Page 4 <br /> to 12 feet bgs of monitoring well boring MW-5, and the lowermost five to 10 feet of monitoring <br /> well borings MW-3 and MW-5, respectively Unconfined groundwater occurs from <br /> approximately 8 25 to 9 60 feet bgs The groundwater potentiometnc surface, as measured on <br /> July 29, 1997, is shown on Figure 3 The approximate groundwater flow direction is south- <br /> southeast under a gradient of approximately 0 04 ft/ft However, according to the SJCEHD, <br /> groundwater in the vicinity of the site generally flows to the north-northeast <br /> The only concentrations of hydrocarbons, BTEX, or MTBE identified at the site were detected in <br /> the soil and groundwater samples collected from bonng/monitonng well MW-3 The distribution <br /> pattern of hydrocarbons in this area appear to be confined in the soil between approximately five <br /> and 15 feet bgs which indicates that the possible source of hydrocarbons is from the former <br /> gasoline UST Unknown lighter fraction hydrocarbons in the TPHd range were identified in the <br /> groundwater samples collected from MW-4, MW-5, and MW-6 <br /> REPORT DISTRIBUTION <br /> Apex submitted a copy o£this report to <br /> • 1 Mr Steve Sasson <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95201 <br /> 2 Ms Elizabeth Thayer <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3015 <br /> REMARKS/SIGNATURES <br /> This report is based on avatlable information and was prepared in accordance with currently <br /> accepted geologic, hydrogeologic and engineering practice The interpretations and conclusions <br /> contained within this report represent the professional opinions of Apex Envirotech, Inc No <br /> other warranty is implied or intended <br /> This report has been prepared for the sole use of Colberg Boat Works and applies to the subject <br /> site only Use of this report by third parties shall be at such parties' sole risk The work described <br /> herein was performed under the direct review and supervision of the professional geologist, <br /> registered with the State of Califorma, whose signature appears below <br /> • <br /> C IXBPR0I-1\C'S%C0L01 0011iNVSTRPT WPD <br />