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Division (PHS/EHD) required further groundwater assessment. The <br /> results of the initial monitoring well installation and sampling <br /> were detailed in a report submitted to the PHS/EHD dated June, 26 <br /> 1992. <br /> Two additional monitoring wells were installed by GeoAudit on <br /> November 12 , 1992 . One well was installed south of the warehouse, <br /> near the southern boundary of the property (near the Manna Pro <br /> facility) . The other monitoring well was installed east of the <br /> former tank excavation. Installation and sampling procedures and <br /> results were described in the "Groundwater Monitoring Well <br /> Installation Report" dated January 8, 1993 . <br /> 2.5 Groundwater Depth and Gradient <br /> On 24 November 1992, the depth to groundwater was measured, the <br /> three wells were purged and samples were collected. Because of a <br /> possible laboratory labeling error, on 22 January 1993 , a <br /> replacement sample was collected from monitoring well MW-3 . <br /> At the time of sampling, depth to groundwater was approximately 42 <br /> feet in each well.. The gradient was determined to be 0. 008 ft/ft, <br /> oriented N 410 W. <br /> 2.6 Laboratory Results <br /> Groundwater samples collected during the November 1992 sampling <br /> event were analyzed for TPH and BTE&X. Laboratory analyses reported <br /> concentrations of TPH as gasoline, benzene and toluene in MW-1 of <br /> 220 µg/1, 15 pg/l and 0. 30 µg/1 respectively. No TPH as gasoline, <br /> benzene or toluene was reported in MW-2 or MW-3 . TPH as diesel was <br /> reported in MW--3 at a level of 140 µg/1. However this result is <br /> thought to be the result of a laboratory labeling error. The <br /> January 1993 replacement sample for MW-3 showed no diesel <br /> contamination. <br /> 3.0 SCOPE OF WORK <br /> The extent of down-gradient groundwater contamination has not been <br /> fully defined. GeoAudit will install two additional groundwater <br /> monitoring wells north and northwest of monitoring well #1 to <br /> further assess the lateral extent of contamination (see Figure 2) . <br /> To meet the project objectives, the following procedures will be <br /> performed: <br /> 1) Notify the San Joaquin County Environmental Health Division <br /> (SJEHD) 48 hours prior to work initiation. <br /> 2) Drill two borings to a depth of 50 - 55 feet using a truck- <br /> 2 <br />