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1 WALLACE -KUHL August 26, 1999 <br /> &ASSOCIATES INC <br /> ' Ms Carol Oz <br /> San Joaquin County Public Health Services Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Report ofFindingsforAdditional Subsurface Soil and Groundwater Investigation <br /> 1444 MARIPOSA ROAD <br /> Stockton, California <br /> WKA No 2938 05 <br /> As required by San Joaquin County Public Health Services Department(SJCPHS) <br /> in a letter dated March 17, 1999,we have prepared this Report of Findings for an <br /> 4 additional subsurface soil and groundwater investigation at the above site located at <br /> 1444 Mariposa Road, Stockton, California(Plate 1) This report has been prepared <br /> on behalf of our client,U S Rentals Inc, a wholly-owned subsidiary of United <br /> Rentals, Inc The purpose of our work was to further evaluate the vertical extent of <br /> r <br /> petroleum hydrocarbons and oxygenates in soil located along the east side of the <br /> former underground storage tank(UST)excavation and to further evaluate the lateral <br /> i <br /> extent of petroleum hydrocarbons and oxygenates in groundwater <br /> Geotechnical Engineering <br /> Engineering Geology Our scope of work included the following <br /> Environmental Consulting . obtaining soil boring and groundwater monitoring well permits from <br /> �+~- H <br /> Remediation Services SJCP S <br /> • drilling one soil boring to a depth of 100 feet below surface grade <br /> Comtreieuon Inspection <br /> (bsg) in the vicinity of the former UST excavation and four soil <br /> Materials Testing borings to depths of 70 feet bsg along the northwest, northeast, <br /> southwest and east sides of the property <br /> }` • obtaining soil samples from the soil boring located along the east side <br /> of the former UST excavation for chemical analysis of Total Petroleum <br /> 3050[naustrial B1�a Hydrocarbons (TPH) as gasoline using modified EPA Method 8015, <br /> West Sacramento <br /> Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) <br /> CA 95691 <br /> -� 9163721434 <br /> Fax 916 372 2565 <br /> 11"dedpap— <br />