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WALLACE - KUHL April 28, 2000 <br /> &ASSOCIATES INC. <br /> Ms. Carol Oz <br /> San Joaquin County Public Health Services Department <br /> 5304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Quarterly Groundwater Monitoring and Sampling R <br /> and Project Summary Update <br /> 1.444 MARIPOSA ROAD Q <br /> Stockton, California 95205 <br /> ENVI RONI�iLIQf�AMRA1_TH <br /> Ef`,.:� WKA No. 2938.05 <br /> E�TtA' ��+LTH <br /> PERMIT 1 SERVICES <br /> � } As required by the San Joaquin County Public Health Services, we are submitting <br /> "f this quarterly status report on behalf of our client, United Rentals, Inc., for the <br /> subject property located at 1444 Mariposa Road in Stockton, California(Plate 1). <br /> During the previous well survey we confirmed the existence of 51 wells within a <br /> 2,000-foot radius of the site either through review of well construction records, <br /> windshield survey or interviews. The nearest wells are located on Mariposa Road, <br /> Learned Avenue,Hall Avenue, and Section Avenue as noted in the August 26, <br /> y-- 1999 Report of Findings for Additional Subsurface Soil and Groundwater <br /> Investigation. The location of each well located within a 2,000-foot radius of the <br /> site is shown on Plate 2. <br /> Geotechnical En�[neerin, Groundwater monitoring and sampling of the seven on-site monitoring wells MW 1 <br /> through MW7 was performed on December 7, 1999 and April 18,2000. Depth to <br /> EnKmrering Geology groundwater measurements obtained during the most recent sampling event ranged <br /> from 46.16 and 47.32 feet below well casing (Table 1). The flow direction beneath <br /> Environmenral Con:ulti" the site was calculated to be to the southeast with a variable gradient. <br /> Groundwater contours for the December 1999 and March 2000 groundwater <br /> Remediation Services monitoring and sampling events are presented on Plates 3 and 4, respectively. <br /> E Consrruction Inspection <br /> A groundwater sample was obtained from the onsite domestic well during the <br /> x Materials Testing December 7, 1999 quarterly sampling event. Prior to sampling,the well was <br /> pumped for several minutes. Total petroleum hydrocarbons as gasoline,BTEX <br /> and oxygenates were not detected in the water sample obtained from the onsite <br /> domestic well. The onsite domestic well is located downgradient of the former <br /> UST location and at the southeast corner of the property between wells MW3 and <br /> 3050 Industrial Blvd. MW6. The reported depth of the domestic well is 191 feet deep. No records of <br /> Wesr Sacramento boring logs or well construction details are on file at San Joaquin County. On <br /> CA 95691 January 1, 2000 we performed a record search on the domestic well at the <br /> Department of Water Resources (DWR). No records of boring logs or well <br /> ,. 916.3"x1.1434 construction details were encountered during the search. <br /> Fax 910.372.2565 <br />