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25 October 1997. r_ - <br /> a <br /> AGE-NC Project No. 97-036 <br /> Page 2 of 6 <br />?. s <br /> 2,.3. GROUNDWATER DEPTH AND=FL4_W DIRECTION _ p k, <br /> i _ .- - a l t-• .':::'�• - ' r �r -1 l <br /> Ground-watez was not encountered during excavation of the UST area. Based upon the San 3oaqucn <br /> County flood Control Map Lines ofEqual Depth in'Water-Wells'1993, ground water depth in the <br /> ' area of the site is approxirriately:15 to ZO feet below surface grade(bsg). The regional:ground water <br /> flow direction is,toward.the northweit,;however ground water;flow'direction can vary locally and, <br /> seasonally y .s. ` <br /> Former:ground water monitoring wells, City of Manteca Numbers Fand.2, were'located oii,the.site.; <br /> T These wells have beend.W <br /> .abandoneater depths recorden the site'have ranged from 16 feet'below� <br /> surface-grade (bsg)to 21 feet•bsg in 1976.°arid 25 feet bsg in;1990: <br /> JV <br /> 3.0. PROCEDURES'.,',_ ,,. <br /> 3.:1. SOIL PROBE BORINGS <br /> - _ , - Y T ri5 `•-' - ' y ~- r. F - _f.-•25r. \....' .' _ t .F ' � - 1N <br /> One soil probe boring•was'advanced at the site on 17 September 1997.Figure 2 depicts the location- <br /> of the probe boring: The-probe boring was`advanced using AGE's vary=mounted°Geoprobe 5400 sacl <br /> probing Ypachine Y <br /> Probe Boring P.1 was advanced at the northwest edge of the former'UST excavation !,Consofiiiated:; <br /> concrete-like road base had,been-used to backfill the foririer excavation,.causingcoritinual-refusal x - <br /> to advance for the Geoprobe'directly over the former-excavation..`The probe baring was advanced y <br /> e` _to a depth of 35 feet bsg at the re'quesf of the'PHS-EHD.=After all samples were collected the soil , ' Y <br /> boring was backfilled with neat cernent,,using atremie pipe.from a depth'of 25 feet bs`g" <br />' h 3.2. COLLECTION_ `OF SOIL SAMALES:. { t <br /> Discrete soil samples were,colle' cted frorri,;the probe boring at 57f6ot intervals beginnink'-at-a'depth' ,, <br /> of 5 feet bsg. The samples were-collected using a-1375-ineli`diameter;two-foot pistori•type-sampler <br /> 1. loaded with four pre'cleaned 6Rinch brass-sleeves.,The sarnplingequipment=was Washed in an <br /> Alconox solutiori acid rinsed with Water prior to each sampling cun_to-.prevent cross contamination <br /> 4 Upon sample retrieval;both e. of the second brass sleeve were covered with Teflon sheets;capped <br /> " and sealed with tape. Samples were then placed in a'chille-d'contairier and transported under chain-of- <br /> r custody .to`McCampbell Arialyfical, Inc: (MAI} cn`Pacheco Californca:� Selected samples 'Were,' <br />'- analyzed for total petroleum`hydrocarbons,quantified as 'asoline (TPH=g), for ;volatile arorriatccs <br /> (benzene,•to.luene,'ethyl benzene.grid Xylenes: BTE&X), aiid other-oxygenated .fuel additives, <br /> a r,..•_ f - yr-. -AdvancedGeoEnyironmeatal,tnc y <br /> it d s t i <br /> - .ice m�- —�-a —yl'-^! '��+ •r'� - �? ' - ` � � F �T <br /> - +- `'£N: r "'. "y • ''"-7=74i'As.-L ?'.� °:'" S-. 1.. f_ ,� �., .- c ....__kn' ,;r..'.... +. ?x, .n.,'S 'x. , <br />