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n <br /> 05 May 1997 <br /> , I <br /> G II, <br /> AGE-NC Project No 95-0139 � <br /> { t [ <br /> Page 8 of 9 <br /> 1 <br /> ' <br /> 4 3 WELL SURVEY <br /> Two-municipal wells were determined to be within the 2,000 foot search radius of the subject <br /> property The "Tide Water";well is located approximately 1;300 feet southwest of the site at Tracy <br /> Blvd and 6`'` street, the "Lewis Manor" well is Iocated approximately 1,400 feet west of the site " <br /> between 11`h and 12'` Streets and Tracy Blvd and Lincoln Blvd The "Lincoln Park"well is located <br /> approximately 2,500 feet east-northeast of the site at Holly Drive and Eaton Avenue The closest <br /> down-gradient municipal well is the "Ball Park"well located approximately 4,700 feet north of the' <br /> ` site at Tracy Blvd and Grant Line Road Locations of municipal wells,are illustrated on Figure 7 <br /> 5.0:' CONCLUSIONS AND RECOMMENDATIONS <br /> 1 <br /> „ k 51 CONCLUSIONS L <br /> Based on data collected at the site, AGE has the following conclusions <br /> 1 , <br /> The known leaking underground storage tanks have been removed Excavation was !" <br />�� • ', <br /> ' performed to remove the major portion of the impacted soil A small pocket of impacted soil <br /> remains near MW-1 between depths of approximately 10 to 13 feet bsg A sinal] area of ' <br /> impacted soil remains west of the new USTs location Only a small volume of impacted soil <br /> remains at the site <br /> • Benzene-was detected in only two of sixteen excavation samples collected at the site at <br /> - concentrations of 0 011 ppm and 0 082 ppm 'BTE&X were detected at a maximum t ' <br /> concentration of 11, ppm(xylenes) Therefore, these constituents, which are of most concern <br /> regarding human health, have small'masses on the,property- <br /> I <br /> I <br /> •° MTBE was detected in only one well,'MW2, which has contained Iow concentrations of F l� <br /> 4 , TPH-g and ethylbenzefte at only one previous time (June'1994), and is apparently outside <br />' the margin of the known plume MTBE,was not detected in any other wells on the property, <br /> even those'impacted by petroleum hydrocarbons Given the,consistent northward ground <br /> ` water flow direction,it isrpossible that the MTBE detected in Iv1W2 onginated from a surface <br /> ispillage or release related to�the current USTs and/or dispensers on the property,"and is not <br /> related to,the'unauthorized release(s) currently being monitored <br /> I _ <br /> rocarbon concentrations°in MW-i have exhibited neither a definite <br /> Total petroleum hyd <br /> increasing nor decreasing trend, but'have fluctuated around an average concentration of <br /> 2,900 ppb since 1993 STE&X concentrations also fluctuated over time with no strong <br /> I - increasing of decreasing trends developed <br /> II <br /> ' Low concentrations of petroleum hydrocarbons have been detected in MW-2,MW-3 or MW- I ' <br /> i <br /> h <br />