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Boyett Petroleum,Manteca
<br /> Third Quarter 2002 Groundwater Monitoring Report
<br /> Page 7
<br /> monitoring wells, are located at I51 S. Main Street, approximately 1,000 feet north of the site. W18, one
<br /> drinking water well, is located at Manteca High School, approximately 1,800 feet northeast of the site.
<br /> 5.2 SCHOOLS
<br /> Two schools were identified within the study area:
<br /> I. Manteca High School (SI in Figure 5, Appendix A) is located at 450 E. Yosemite Avenue,
<br /> approximately 1,400 feet northeast of the site.
<br /> 2. Manteca Community Day School (S2 in Figure 5, Appendix A) is located at 680 Mikesell Avenue,
<br /> approximately 1,600 feet east of the site.
<br /> 5.3 UTILITIES
<br /> The City of Manteca Public Works (CMPW) is the public water purveyor currently servicing the study area.
<br /> CMPW was contacted in an effort to obtain a list of public water users, but this information is not available due
<br /> to confidentiality. CMPW indicated that they service the study area; but they were not able to guarantee that
<br /> every address within the study area is served by municipal water.
<br /> CMPW was also contacted for possible municipal wells within the 2,000-ft radius. One well, The City of
<br /> Manteca Well #5 (W3 in Figure 5,Appendix A) located at 331 Jessie Avenue, was located approximately 1,500
<br /> ' feet west of the site. During the area reconnaissance, this well was observed at 323 Jessie Avenue. Mr. Joe
<br /> Wells of CMPW indicated that a groundwater sampled collected from this well in September 2002, tested
<br /> negative for MTBE. Eric Medeiros of CMPW described this well as follows:
<br /> ■ The well was installed in 1952 to a total depth of 125 feet bgs and was constructed using 100 feet of
<br /> 18-inch casing with no screened intervals.
<br /> ' Interviews with selected residents were conducted to determine whether the neighborhoods, schools, and
<br /> businesses were serviced by public or private water supply. All the contacted residents within the study area
<br /> stated that they receive municipal water. Public water usage could not be verified for each and every resident.
<br /> 6.0 SUMMARY AND CONCLUSIONS
<br /> On September 26, 2002, a Condor representative collected depth-to-water measurements in all nine monitoring
<br />' wells and collected groundwater samples for laboratory analyses from monitoring wells MW-1 through MW-3
<br /> and MW-7 through MW-9. Monitoring wells MW-4, MW-5, and MW-6 exhibited siltation. At the request of
<br /> the SJCEHD, redevelopment activities were conducted for these wells on September 27, 2002. Redevelopment
<br /> of MW-4 and MW-5 was not successful. Based on our field observations, it appears the casings of these wells
<br /> are damaged allowing the annular sand pack to infiltrate inside the casings. MW-6 was successfully
<br /> redeveloped by removing a significant amount of-the sediment from inside the well casing. A groundwater
<br />' sample was collected for laboratory analyses for MW-6 on September 30, 2002. Floating product, sheen, and
<br /> odors associated with petroleum hydrocarbons were not observed during the groundwater sampling. All of the
<br /> groundwater monitoring wells sampled contained a significant amount of suspended sediment.
<br /> 1 Laboratory analytical results for the groundwater samples collected at the site on September 26 and 30, 2002,
<br /> indicate that none of the analytes of concern (BTEX, TPH-G, and selected gasoline oxygenates/additives)were
<br /> UGLUULCU III ulc g1UUIIUWULGr Salllples collected from ivlW-,i, MW-ti, and MW-8. M'113E was detected in the
<br /> groundwater samples collected from MW-1, MW-2, MW-7, and MW-9. TAME was also detected in the
<br /> groundwater samples collected from MW-1 and MW-7. The laboratory analytical results for MW-3, MW-6,
<br />' MW-8, and MW-9 are consistent with historical data. The laboratory analytical results for the September 2002
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<br /> �'"a CONDOR
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