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April 23, 1991 <br /> Project 310-01.02 <br /> Page 2 <br /> groundwater elevation,and a slight change in groundwater flow direction from <br /> north-northwesterly to northwesterly since the previous groundwater monitoring <br /> event. <br /> Groundwater samples collected from Monitoring Wells U-1, U-2,and U-3 on <br /> February 14, 1991,were analyzed for total petroleum hydrocarbons calculated as <br /> gasoline(TPH-gasoline), total petroleum hydrocarbons calculated as diesel <br /> (TPH-diesel), and benzene, toluene,ethylbenzene, and xylenes(BTEX <br /> compounds).The groundwater sample collected from 1 vas found to <br /> �tj�tta�,�part�.per:lillion{�i�,�.)�'FPH.�aS�liae..lQ.�iRb 1����rie:arld.�1 gip" <br /> � ���3(Table 2) The groundwater sample from�� �` �ri�'2�t3`p�b:� <br /> '7�rg�vlirt6:�,pp �#��stize$f,�=S PP�•�eth�►ITe"ecte and��"pp�ryler�e.� These <br /> dissolved hydrocarbon concentrations are slightly lower than in the previous <br /> quarter. C,) dwatez a€tegted.fram well;L3•:3°co ifaiaedS'd ddlecfaital� <br /> rltiic�fls OTPI-gaseTPH ci�eseo ;comp:owiii�! No <br /> ..: . , <br /> T1H-diesel was detected in site monitoring wells. The certified analytical reports <br /> and field data sheets are included in Attachment B. <br /> Additional Investigation <br /> The extent of petroleum hydrocarbons in the soil and groundwater underlying the <br /> site is not currently defined. PACIFIC submitted a technical report dated <br /> ' February 13, 1991,documenting the results of the soil and groundwater <br /> investigation conducted at the site. Recommendations to install three additional <br /> groundwater monitoring wells and four exploratory soil borings in the western <br /> portion of rhe site were included in that report. PACIFIC is currently in the <br /> process of obtaining the necessary permits to proceed with the investigation. The <br /> next quarterly groundwater sampling event is scheduled for May 1991,pending the <br /> ' installation of the proposed wells. <br /> i <br /> E <br /> :ILV}IO?;11)71 <br /> iP <br />