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r" a� e.r. a .sr ,. - F. AT s _ _ r Wz- s25 March 2005VVip - = AGE NC'Project No:04 1232 Page 2 of 4 - 4 SUBSURFACE FIELDr PROCEDURES - } t "� - J = - The investigation'was conducted in accordance with:Limrted'�Nite-AssessmentWork-P.lan'(Septic - -TaA'Area) ,to collect-and analyze soil samples:from-.beneafl' the-Septic tank, the:bottom V the s seepage pit and three intervals.of the Teach trench.related to the on site, commercial septic system -On..14 March 2005;a Well Boring'.Permit Application was submitted and approved.Further on--site _ inspection, of =#he' septic system 'during aampling-reve-aled._the;.previously `unknown -system coristnicfion. The septic system was drscovered-include-a-1;25,0 to L500 gallon'septic tank:with a-- y; - single discharge,trench flled"with filterrock.=The discharge.trench was.approximately 35-feet rn length and:-covered by a 12 inch concrete pipe.half,which-emptied into a 24-inch seepa&i.-The seepage pit was determined to be approximately 13�15 feet below surface grade The design of the- offline septic:-system and locations of the.samplipg points are:indicate'd on the site plan(1�gure 2).", v_ SOIL-SAMPLING HL Ori 1:4March.2005,an AGE representative met Mr. Michael Infurna-of the-SJGEHD at the site for ' approval o1.the requested sarnpling''lo'dhons Followirig SJGEHD concurrence;five soil samples - (513-1 through.SB-05) Were collected.at,the specified-locations_S-amples SB 1-through SB-:3 were - collected at depths of 3 to 5 feet bsg,-directly.beneath the leach trench;-sample SB-4 was collected at'13.5 feet,bsg directly beneath the seepage pit; sample SB-5 was collected at 6 feet bsg directly beneath�the septic tank-at the discharge end: Soil samples were collected using a Geoprobe soil a _ . - _ - sampling assembly loaded with.four pre-cleaned 1.425-inch by,6-inch brass sleeves or with a°hand ~. . auger arid'slide hammer loaded with single 2 nch by.6 m .h'brass:sleeve.:The iipperniost sleeve of each soil sample assembly Was preserved by covering;both ends of the brass sleeve with Teflon ` sheets, capping, and sealing with tape 12 -1 ZEL All sam les were proper lade ed,'placed n a a ro hate;chilled container and trans ported under _ - p . p p Y_T pP p- p chain-of.custody to Cal:Tech Envir_onrriental Laboratory a State of Cahforriia Department of Health Services: DHS =certified laborato As ntatives of both-AGE er consultatiori betweenthe're rese{ ).� rY ° p p . ..and SJCEHD,a modified analytical-'scheme`was,implemented at the site to satisfy'the requirements :of SJCEHD._The.samples'using the znodzfled analysis Were analyzed for = - * _Total_petioleuni.hydrocarbons quanti f ed,as_gasoline;,and diesel..(TPH=g,and.TPH-d) m accordance with EPA:Method.8015m;and ti - _ •}Full scarf 8260,:iri accordance with EPA 1Vletliodu:82601i '� - �{ - tj - `�� s•_ - - ter' + _ -.. 3's ': - - -. ' f _ -s'�n.q of }" AdvanceeoEnvironmental,Inc. _ ' - - _.. .,,-. • _ r .. �.. �.. ., 1'_- -...:--res. r� �'�' '�'-r' ,. ?.. ,fir.' :a..,. ^. 'a . . A-;' ' _