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1101 <br /> ,yam <br /> -0 <br /> 6 <br /> 6 <br /> una <br /> t.+ <br /> �N a1i�e:S�if�i; <br /> -P-9 <br /> August 27, 1991 <br /> i: `11iii •Llii',�. •� i •:I:?1..51 <br /> Mr. Chuck Cannel <br /> ARCO Products Company <br /> Post Office Box 5811 017-569`.•-3811 <br /> San Mateo.California 94402 <br /> Subject: 1991 Second Quarterly Report for ARCO Staiion 2133, <br /> 2908 Benjamin Holt Drive,Stockton, California <br /> Dear Mr.Carmel: <br /> analytical result_r of groundwater <br /> This report presents the second quarterly watera1evelCO�Station 2133, located at 2908 <br /> sampling performed at ARCO Products CoITIPmae wow was - r¢ormf d on April:23,1991 11nder <br /> Benjamin Holt Drive in Stockton,Califonria h B-12 and PR-1, PR-2, <br /> Task Order 2133-91-SA. There are fifteen on-site wells:ied during sampling event. The <br /> BHD-1, and BHD-2 (Figure 1). Bight wells were camp manufactured and <br /> the April t , 1991, sampling were not correctly <br /> sample bottles used during lett on May 2,1991 Ps a result of the <br /> allowed air into the samples. All of the wens were xesarrrp <br /> faulty bottles. <br /> Field and Analytical Methods � <br /> -to rater levels,supervisz 1.Purging of each weL, <br /> Brown and Caldwell personnel treasured depth _ for <br /> and collected groundwater samples at <br /> the site. efe 'ele-tricot eo ducti�r tyeand tlemperature <br /> description. A copy ui the field notes <br /> containing P <br /> readings is included as Exhibit B. <br /> Ail groundwater samples were analyzed for total p <br /> etroleum hydrocarbons (i`7PH) and bl-merle, <br /> ethylbertzcne,toluene,and xylenes 03M)by Modzfteci U .S.Environmental iQrotectioti'R�gency <br /> Method 8015/5030- <br /> ` Results " <br /> The groundwater flow direction is to the north-northeast• The hydm'rhe gradient is approximately <br /> g <br /> 0.442. Table 1 presents the warPr levhe flow dire;t'o"' <br /> el data in tabular form. Table <br /> of the presents <br /> levels easured ton <br /> he <br /> and gradient for this and past-samplrng events. Comp <br /> 1 with those measured in ]February 1991 indicate no sipnifrcant change ut 1 <br /> April 23, 991, groundwater elevations, <br /> general groundwater flow direction or hydraulic gradientH However, <br /> txtraction well. Figure 1 { <br /> as measured on April 23, 1991,reflect the intermittent pumping <br />