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Martin Thorpe <br /> 16 October 1987 S WEISS.ASS0gM ES <br /> SUBSURFACE CONDITIONS <br /> Scils beneath . the s'Ce consist sist predominantly of silts and sands . .of <br /> moderate to, high : estimated permeability, with occasional interbeds of clays <br /> and silts of -low estimated permeability. Although minor variations in soil <br /> composition and "unit thickness are seen between borings, � there is generally i <br /> good_syratigraphiccorrelation across the site. lGrounid water was encountered <br /> dri-l-1ing-mat_approximately 90t4-fbelow ground surface– Boring <br /> fdur-ing— logs are <br /> included_as;-Attachment_L <br /> - a <br /> MONITORING W N <br /> I WELL INSTALLATION. . <br /> Monitoring we11s were installed asi23 .TulyM_1987y„ by EGS and . Spectrum <br /> Exploration . .:'of Stockton, California under the supervision of'WA. geologist <br /> Joseph Theisen. �iW 11 was drilled to a totali'spth cif7t:5 —and was <br /> __._. ... .-. _ <br /> ccmpeted to a depth of-65–ft' This well monitors ground water 'adjacent :to <br /> - -- -� <br /> and beneath the � t -Eo—a.�_.. a �„r = 6 <br /> tank excavat�aci. MW�2+was dr�I]ed to a total depth of 65.5 .,: <br /> ft, was com rated to 60 ft and monitors round water. southwes <br /> _ p --– - "r _ w g t of the tank <br /> excavation '.5t a ompleted to <br /> 3 was drilled to tota " epth of-65.S ft and was c <br /> Fdept of 59 f This well monitors ground water betwegn the tarn excavation <br /> and the City" of Lodi municipal well. . <br /> Monitoring wells were constructed of - 4-in. ID factory-threaded' :Schedule. <br /> 40 PVC casing and screen- and were screened from 10 to 13 ft abov6 ' ch6 static <br /> water level. .r_o allow for seasonal ground water ' fluctuations To.` prevent <br /> surface infiltration' into the wells, a I.J/2 ft bentonite seal was placed in <br /> - the anrulus'.above the sandpack and the remaining annulus .was r.h�n Ei.11ees w!tri <br /> neat cement ' grout. to the ground surface. Placement of the f,rour was witnessed <br /> by�Dan Guerra of the S.7LHD. .' <br /> WELL DEVELOPMENT AND WATER SAMPLING <br /> Monitoring wells were developed on 11 August 1987 by airlift evacuation'. <br /> A_total-o£ 240 gallons werewithdrawn from the three wells.. Approximately 110 <br /> G <br />