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(reported to us verbally) contained similar concentrations of TPHg and BTEX as the initial <br /> monitoring event on January 13, 1994 (Table 5) Note WKA's laboratory data set indicated that <br /> groundwater collected from MW3 contained a similar concentration to that collected from MW4 <br /> during the first monitoring event, and that groundwater collected from MW4 contained the <br /> concentrations of groundwater collected previously from MW3, it has been assumed that WKA's <br /> samples were switched in the field or that laboratory analyses were reported incorrectly, therefore, <br /> we have taken the liberty of reporting the results in a manner consistent with our previous data <br /> TABLE 5 <br /> GROUNDWATER SAMPLE RESULTS <br /> 1766 MONTE DIABLO AVENUE <br /> STOCKTON, CALIFORNIA <br /> }".�` <br /> K2Rt*ac,i� •xco' }k k�l�•t o�i~°',`, `oo •` r � �i.i <br /> �M o w `l` .Y:ta. c..� •14" .c< v :>�a s v kvv"o~ ` .`:..,,. .tk v <br /> r. ♦alt •\ham �� ttl� <br /> Jan 13, 1994 <br /> W-20-MW2 <50 <0 3 <0 3 <0 3 <0 9 NA <br /> W-20-MW3 1,700 21 15 37 45 NA <br /> W-22-MW4 170,000 45,000 40,000 <3000 12,000 NA <br /> Jun 14, 1994 <br /> MW2 <50 <0 3 <0 3 <0 3 <0 9 NA <br /> MW3 1,500 28 3 7 70 18 NA <br /> MW4 100,000 23,000 25,000 2,900 15,000 NA <br /> Laboratory analyses performed on Jan 13 by Matrix Environmental Laboratories <br /> Laboratory analyses performed on Jun 14 by WEST Laboratories <br /> Laboratory results reported in yg/L (parts per billion) <br /> TPHg= Total Petroleum Hydrocarbons as gasoline <br /> TPHd = Total Petroleum Hydrocarbons as diesel fuel <br /> <50 = Less than the laboratory method detection limits <br /> NA=Not Analyzed <br /> 5 2 4 Groundwater Potentlometric Surface <br /> A groundwater gradient was calculated from surveyed wellhead elevations and groundwater depths <br /> measured in the monitor wells(Table 3) Well casing elevations were measured to the nearest 0 01- <br /> foot by Tom O Morrow, Inc of West Sacramento, California, a licensed surveyor The true <br /> elevations were calculated from a nearby City of Stockton Benchmark #257 These data were used <br /> to calculate the elevation of the groundwater surface in each well (Table 6), to evaluate the slope of <br /> SEACOR 014-01-1 par 10 <br />