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a 1 <br /> 1 5 <br /> z8.4ril 1997 <br /> AGE- Project No 96-0232 <br /> Page 8 cif <br /> 9 <br /> CONCLUSION_ S AND RECOMMENDATIONS` <br /> CONCLUSIONS <br /> r <br /> ; <br /> r <br /> f. •d <br /> Based upon data:collected-during 7uly and August 1996,,AGE has reached the followin''co" I' sioris: <br /> Gro'und'water-flow direction.at the site is generally toward the south. IVian►toring well MW-4 <br /> is-up-gra0j0n ,6f'the„existing UST area,'while.we11 ' MW�I and"MW-2 are dowan-gradient.; <br /> fConcentrations.of TPH-g and BTEBcX are below laboratory reporting•limits in ' 'nd'•water <br />' . sarriples taken W- <br /> from M1 MW-2 and MW-4. V <br /> _ a,.... ' . . x, <br /> Concentrations of MTBE;"detected.iri-MW I.during;3uly and•August.1996 were above the ' <br />' :.recommended State of California Drinking'Water Action Limit(AL)_of`3 5 ppb <br /> The concentration of TPH;d detected in MW-Zdunng-the August,1996 ssampliiig•was- <br /> slightly <br /> above the USEPA'Suggested-No Adverse'Response:Level (SN'ARL) of I00 �g/l. <br /> • The domestic water Well system.located approximately 75=feet southwest of the site does not <br /> appear to be impacted by-petroleum hydrocarbons.. ` 1.. <br /> 5 2 RECOh'IlyIENDATIONS A <br /> Based.upon data collected from the site; AGE'recornmends the,following:- : <br /> • Even though low,concentrations:of TPH-d and MTBE'weic eneounteied'iri ground water <br /> a . <br /> samples collected at'MW=1; MW-2 aiid•MW-4, itisunlikelythat-any,,remaining petroleum'. <br /> meat <br /> hydrocarbons b h the'site:pose a significant environmental”concern. Furthermore during ,. •; <br /> a phone conversation with the PHS-EHD-on'11:; epte'mber 1996;it was stated b'y.Mr. Mike <br /> Izifiirna'tfiA based upon'non,detectibn of petroleui�hydrocarbons in soil_ samples. collected <br /> I at MW-4 and based u on round water=sarri le results collected in,'Jul',. <br /> p g- p y,and August-1996, it ' <br /> would be';the intent of the PHS-EHD'to issue site'closure.lBased'upon the data`collectedrfrom ' <br /> ;t h'i's Ste,-Closure is warranted and therefore.recommended.` <br /> ' ^ ,' • til I V 1 — ' s t r-. - - - _ ., 1 <br /> 6 0 LIlViiTATI, ONS <br /> `Our-professional s6Mces%were performed'using'that degree`of care-and skill ordinarily''exercised'by <br /> � . <br /> erivironinental consultants practicing in this or similar",localities. The findings were based upon' <br /> analytical results provided by an mdeperident;lab'oratory:,,;"Evaluations of the geologic/hydrogeologic <br /> conditions.at the site for the puipose'o f this mvestig4gon ar6,made from a limited'numberof available' , <br /> ' '' ` 'V r 1, t• J• ,� , , F ` - .5 -t ' <br />