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GBeta cAssociates <br /> Consultants in Waste Management,Environmental Control and the Geotechnical Sciences <br /> November 14, 1979 <br /> Project 116-1 . 1 <br /> ` State of California <br /> Central Valley Regional Water v <br /> n17 <br /> Quality Control Board U <br /> 3201 "S" Street <br /> 1� <br /> ramesnto, California 95816 NOV 2.1 1979 <br /> °AttentIon: Mr. f=rank t4cDe-.-rr3:t, Atwe Eng neer <br /> SAN J!AQVIN LOO L <br /> F Subject: Inspection of Oi sposal Trench #3 <br /> HEAL 1-1 il� ii.CT, <br /> .Forward Disoosal 'Site <br /> San Joaquin County, California <br /> Gentlemen: <br /> In response to your request, l am submitting the. following descr 'aption <br /> Of- the subject activity. <br /> Excavation and construction work was completed on Disposal Trench #3 <br /> on November 2, 1979, and an inspection by regulatory persrrnel from <br /> State and County agencies was reauestad. The inspection was schedulp.0 <br /> for Thursday, November 8, 1919, and was attended by the fol icwing: <br /> Frank McDermott Central Vai1Ay Regional Water Quality <br /> Control board <br /> Jim ?arsons State Water Resources Control Board <br /> Clyde Cass California Department of Health Services <br /> Betty Taylor California Department of health Services <br /> C. Leland hall Sari Joaquin. Local Health ::Iistrict <br /> Jim Jones Forward, Inc. <br /> Jack McCollough Beta Associates <br /> During the inspection; a tense of fine to medium-grained sand was observed <br /> in the west-central Trench wall immediately above the trench `loor. The <br /> lense measured 60 feet in kzngth and a maximum of 3.5 feet in thickness. ,' <br /> At the request of Stare and County regulatory perscnnel , the sand lense <br /> was excavated and removed using on-site equipment operated by Forward, lnc. 0 " <br /> employees. The excavation was extended 3 feet into the trench w-111 and <br /> 2.5 feet below trench invert elevation to remove the �iaximu!r, possible <br /> volume of sand. Silty clay soil was then borrovled fr•cr,i avai fable on-site <br /> stockpiles and was placed and compacted to form a soli liner over the <br /> exposed sand lense. The silty ciay -...is ,praad in 1i*ts not to exceed <br /> I foot in th-ickness, then wheel-rolled with a loaded i27yard scraper to <br /> 326 Commercial Street • San Jose, California 95112 9 (408) 2954483 <br />