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1.0 Introduction <br /> On February 14, 1997 groundwater monitoring and sampling was performed at the San Joaquin <br /> ' Catholic Cemetery The site is located approximately one mile north of downtown Stockton, <br /> California(Figure 1) <br /> 2.0 Groundwater Gradient <br /> ' Depth-to-groundwater measurements were taken in all five groundwater monitoring wells and <br /> two of the four vapor extraction wells (VW-1 and VW-2) to evaluate groundwater flow and <br /> ' gradient characteristics (Figure 2 - Site Plan) The depth-to-groundwater at the site ranged from <br /> 45 36 to 47 11 feet below ground surface The elevation of the groundwater surface beneath the <br /> ' site ranged from a low of 29 03 feet below mean sea level (msl) in MW-2 to a high of 28 36 feet <br /> below msl in MW-1 Groundwater levels have risen an average of 5 17 feet since the last <br /> ' monitoring event on September 20, 1996 The groundwater surface is above the well screen <br /> interval in MW-1, -2, -3, -4, and -5 Groundwater monitoring data are summarized in Table 1 <br /> ' water flow direction and adient are illustrated on the groundwater surface ma <br /> The groundgr g p <br /> (Figure 3) In general, the maximum groundwater gradient was calculated at 0 02 ft/ft in an <br /> easterly direction An anomalously high groundwater elevation measurement in <br /> ' MW-4 suggests that localized mounding may be present Groundwater flow and gradient <br /> characteristics may be unreliable due to groundwater levels above monitoring well screen <br /> tintervals <br /> 3.0 Groundwater Sampling and Analyses <br /> ' In the past, the five on-site monitoring wells have been sampled during quarterly groundwater <br /> monitoring Due to the rise in the groundwater surface elevation of approximately 20 55 feet <br /> ' since May of 1992, the screen intervals of these wells are below the groundwater surface and <br /> may not provide an accurate representation of groundwater table conditions In order to collect <br /> ' groundwater samples representative of groundwater table conditions, only two vapor extraction <br /> wells with screen intervals coinciding with the groundwater table (VW-1 and VW-2) were <br /> ' sampled this quarter <br /> 1 <br />