ARCHIVED REPORTS_XR0008376 - Laserfiche WebLink

Home Browse Search

Problem Assessment Report Page 7 Ranch Market,23569 South Santa Fe Road,Riverbank CA November 8,2000 5.0 MONTHLY WELL SAMPLING 5.1 Domestic Well and Monitoring Well MW-7 Sampling Monthly groundwater samples were collected from DW-1 on September 1 and October 2, ' 2000 The water samples were collected from collected from the pressure tank water faucet of DW-1 In addition, well MW-7 was also monitored and sampled to confirm the initial analytical results for the water sample collected on August 16, 2000 On September 1, 2000, SECOR personnel measured the depth to water in MW-7 using a water level meter to the nearest 0 01 I feet Approximately 3 well casing volumes of groundwater was purged from MW-7, until pH, temperature, and conductivity readings stabilized (Appendix C) Well MW-7 was monitored to verify at least 80% recovery prior to sampling Once adequate recovery was Iobserved, a disposable hand bailer was used to collect a groundwater sample The water samples from DW-1 and MW-7 were collected in appropriate containers, preserved Ion ice, and transported under chain-of-custody manifest to Kiff Analytical LLC, in Davis, California for analysis The water samples were analyzed using U S Environmental Protection Agency (EPA) method 8260B for BTEX, TPHg, oxygenates, 1,2-DCA and EDB 5.1.1 Domestic Well and Monitoring Well MW-7 Sample Results The two water samples collected from domestic well DW-1 did not contain reportable lie concentrations of BTEX, TPHg, oxygenates, 1,2-DCA, or EDB The results are summarized in Table 3, Copies of the field notes are included in Appendix C, and the results of the Chain of Custody manifests are provided in Appendix D Referring to Table 3, the second water sample collected from MW-7 on September 1, 2000 contained benzene, toluene, xylenes, and TPHg at concentrations one to two magnitudes below the previous sample collected on August 16, 2000 The sample did not contain reportable concentrations of MtBE, oxygenates, 1,2-DCA, or EDB ' 5.2 Domestic Well Nitrate Sample Collection and Results I At the request of the SJCEHD, a technician from Far West Labs collected one water sample from domestic well DW-1 on August 11, 2000 The sample was analyzed for the Community Water Well Analytical Suite and found to exceed the drinking water standard for nitrate as I (NO3) and nitrate plus nitrite as nitrogen (N) On September 21, 2000 SECOR's field geologist used a disposable bailer to collected a grab water sample from the domestic well DW-2, located on the Pantoja Property Far West Labs in Riverbank, California analyzed the sample for the presence of nitrate as (NO3) and nitrate as nitrogen (N) and found the water exceeded the drinking water standard for both Iconstituents i I File PAR-report doe SECOR International Incorporated I