Laserfiche WebLink
TABLE 2 <br /> Groundwater Analytical Results <br /> San Joaquin County Human Services Building Site <br /> First Quarter 1993 <br /> Sample Date: April 15 and 16, 1993 <br /> Method <br /> Monitoring EPA 602 EPA 8015M EPA 8015M EPA 504 EPA 239 2 Notes <br /> Well <br /> Benzene Toluene Ethyl- Xylene TPH-G TPH-D EDB Total Lead <br /> benzene <br /> Detection <br /> Limit 0 50 ug/L 0 50 uglL 050 0 50 uglL 50 uglL 0 050 mglL 0 010 ASIL 0 003 mg/L Primary Sample <br /> uglL <br /> MW-4 ND 21 ND ND 82 ND NDoos ND Primary Sample <br /> MW-5 ND ND ND ND ND ND0048 ND0, ND Primary Sample <br /> MW-6 ND ND ND ND ND ND ND ND Primary Sample <br /> MW-7 17 ND ND ND ND ND0049 NDo, ND Primary Sample <br /> MW-8 ND ND ND ND 2300 NDOoas 0 1230 ND Primary Sample <br />' MW-10' 17 ND ND ND NA" NA NA NA Duplicate of <br /> MW-7 <br /> MW-114 ND 1 3 ND ND NA NA NA NA Deeon Rlnsate <br /> Sample <br /> (after sampling <br /> MW-7) <br />' t ND- Non-detectable at detection limit shown at top of column or in subscript <br /> 2 NA- Not analyzed <br /> 3 MW-10- Duplicate of MW-7 <br />' 4 MW-11 -Equipment dei ontaminatwn sample,6olte.eted after sampling MW-7 <br /> To assist in reviewing trends in the hydrocarbon concentrations found in the various wells at the <br /> site, Table 3 presents a historical chronological summary of the TPH-G concentration data to <br />' date This data appears to be representative of the general hydrocarbon presence trends on the <br /> site The data presented for the time period before this sampling period was developed during <br /> the Phase II Groundwater Investigation in 1991 <br />' 3.0 GROUNDWATER FLOW DIRECTION <br />' Groundwater elevations in each well were measured in order to evaluate the groundwater flow <br /> direction beneath the site The measurements were collected from all five wells within a <br /> minimum amount of time at the beginning of the field effort to ensure that the measurements <br />' reflect a consistent static water level in the aquifer The groundwater elevation measurements <br /> (as shown in Table 1) were plotted on the site map and contoured (Figure 3) to show the <br /> groundwater surface morphology and the groundwater flow direction <br />' STF.SRPTSLSIC ISI'WP <br /> 5 05118!93 <br />