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a <br /> Lai <br /> RESNA WATERWORK CORP. <br /> INDUSTRIES <br /> August 6, 1991 :. s". �T s <br /> AUG 1 3 1 51 <br /> FNVIRONMENTAu HEALTH <br /> PU''MIT/s: "Vlrfy <br /> Mr. Rod Nelson <br /> Laidlaw Corporation <br /> 1444 Tillie Lewis Drive <br /> Stockton, California 95206 <br /> RE: Confirmation groundwater sampling at Laidlaw <br /> Corporation, 1444 Tillie Lewis Drive, <br /> Stockton, California. <br /> Bear Rod: <br /> This letter report is being submitted to present the results of the <br /> confirmation sampling of the groundwaterThe wells weremonitoring webs at <br /> tJthe <br /> above referenced site (Figure 1)- <br /> uly <br /> 9, 1991. <br /> 1 Laboratory results indicate low levers of dissolved contaminants, <br /> apparently associated with the forn.er xylene storage tank, are <br /> present in each of the site monitorLng wells However, only MW31 <br /> contained contaminants..,::.at above the'- state maximum) <br /> p:. <br /> N:.i3 contained, <br /> ooritainin'an ' .1eva1s. for drinking water (NGLs - <br /> etit><y1b_nzene at 3,600 parts per billion (ppb) and xylenes.at`"Z,340�;� <br /> ppb, The' MCLS for'`'ethyylbenxene arid'"x'ylenes"-are'"680 arici 1754 ppti,, r <br /> 1. <br /> respectively. , Analytical results are summarized in Tatale r <br /> ntation <br /> contained in a Attachment 1.d chain-of <br /> purge-custody <br /> logsd are included` are <br /> Attachment 2. <br /> Groundwater levels have fallen. approximately 1.5 to 2 feet across./ <br /> the site sinoP May, 1991. ; The water. level <br /> rounawaterata from <br /> contourJuly <br /> map of <br /> 1991 monitoring were used to create a g <br /> the site (Figure 2) . The contours on Figure 2 depict a <br /> southeasterly gradient of approximately 0.017, or.'89 feet per mile. <br /> Groundwater monitoring data are summarized in Table 2. <br /> cctoeol.w <br /> 1710 MAIN STREET - ESCALON.CA 95320 - (209)8_8.3507 <br /> 235f>_A WALSH AVENUE • SANTA CLARA,CA 9505) 11081 S9Q 1y49 <br />