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e,.:. yi..,..3, - 23.�'•. �-'-r- ="�c:` txs�-"s.-- ,-s;;F sw�,�' <br /> .,nszx.. ,._ '��°ar r°v ,a,ry ..-s: .k; -y...+r _ .' ,�y.,,..n •,�.- ,.�e.-r. .vacs, -xar:_�s .'...rr s- ^- I -xm.% <br /> r <br /> E- . <br /> Mg <br /> i <br /> !htr two larger tank,-t had leen mbnndorycri ir,)iince by fillittrp Witt, <br /> sand., All t,hrre r Inks erre rrmovcd try 070rfstAry by Chevron. <br /> 2.2 INSTALLAsIC:; tF' 1,10NIT010ura AND VAPOR LXTithCTION WrL1,5 <br /> On 23, 24, and 2.5 January 1969, s+!4en :roil borings were drilla(], <br /> Two of the boringn wer, completed as groundwater monitoring wells <br /> (M47 and 048, Firurr 2); ,live of the boringn were completed gas <br /> Mf <br /> vapor axtractlort wells (V1, V2, V3, V4, and V5, F'irlure 2) , The <br /> soil borings/ho.reholea were drilled with a truck Mounted rotary <br /> drill using hollow ate:;, augers. The drill rig and crew were <br /> provided by Spectrum Exploration Inc. (C57 License number: <br /> 512268) . The: wells were drilled and completed according to the <br /> specifications of a Mork Plan that asppcnded permit number 88-2955 <br /> issued by the San Joaquin County Environmental 11colth. <br /> 2.2.1 GROUNDWATER MonrTORIltG WELLS <br /> rr� <br /> Two boreholes were drilled with hollow stem augers than had an <br /> r ( outside diam. ter of 10.25 inches: tr47 was located near the <br /> [ western boundary of the site, in the vicinity of the former waste <br /> 1f oil tank; K48 was located in the northeast corner of the site <br /> .€ (Figure 2) . was drilled to a depth of 43 feet and MW6 to a <br /> depth of 40 feet below the ground surface, 2 to 3 feet Into the <br /> lower conflning, clay layer which occurs throughout the site. <br /> Both Loreholes were completed as monitoring Kelly by installing 15 <br /> fent of factory slotted (0.010 inch slots) PNC casing through the <br /> augurs in the lower, water producing intervals. The casing was <br /> brought to the surface by adding 25 and 24 feet of flushed <br /> threaded, blank casing to MW7 and KdS, respectively. Fail? was <br /> CoWpleted to a depth of 40 feet, and MHO was completed to depth of <br /> 39 feet. tie PVC casing was steam cleaned prior to installation <br /> in the well, at-tl:e-canin:}-Wes---sealed--Frith--as.._.flush,----- — <br /> threaded PVC cap= the ue.1i top was secured with a +rater-tight, <br /> lacking well cap. The annular space around the scroan was filled <br /> with clean Band. The annular spate at�ovo the sand was filled <br />