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A 1I Diamond Lumber-Manteca Quarterly Groundwater Monuonng Page 7 5.1 Monitoring Wells SRK-MW1, SRK MW2 and SRK MW3 The constituents of BTEX were detected at levels slightly greater than the method detection limit (MDL) 2n two of the three SRK monitoring wells (SRK-MW1 and SRK-MW3), while BTEX was not detected in SRK-MW2 Benzene levels were less than 1 ppb,while toluene levels were detected below 13 ppb Ethylbenzene was detected at less than 1 ppb, while xylene was detected at less than 2 ppb Volatile hydrocarbons were detected at 30 ppb in SRK-MW2, which is slightly greater than the MDL ' Volatile hydrocarbons were not detected in monitoring wells SRK-MW1 and SRK-MW-3 Lead levels ranged from 3 ppb in SRK-MWI and SRK-MW3 to 36 ppb in SRK-MW2 5-2 Monitoring Wells BEI-MW4, BEI-MW5 and SRK-MW6 Significantly elevated levels of BTEX and volatile hydrocarbons were detected in monitoring wells BEI- MW4, BEI-MW5 and BEI-MW6 Benzene levels ranged from 160 7 ppb in BEI-MW6 to 7,660 ppb in BEI-MW5, while toluene levels ranged from 13 ppb in BEI-MW6 to 3,025 ppb in BEI-MW5 Ethylbenzene levels ranged from 47 6 ppb in BEI-MW6 to 885 ppb in BEI-MW5, while xylene was detected at 39 3 ppb in BEI-MW6, 694 4 ppb in BEI-MW4, and 9,500 ppb in BET-MW5 Lead levels ranged from 12 ppb in BEI-MW4 to 46 ppb in BEI-MW6 6.0 REGULATORY SITE VISITS IP Ms Margaret Lagorio, Senior REHS with the San Joaquin County PHS/EHD was on-site during the sampling of the three SRK monitoring wells and during soil spreading activities The three BEI monitoring wells had been sampled prior to her arrival After the last SRK monitoring well had been sampled, Ms Lagorio stated that she had reservations regarding sampling procedures using the 4-inch submersible pump equipped with flexible tubing These concerns were reiterated in a correspondence prepared by the PHS/EHD dated February 10, 1993 A copy of this correspondence is provided in Appendix F On behalf of the 650 Management Corporation,poration, SRK addressed these concerns in a correspondence ' dated March 18, 1993 This correspondence contains proposed responsive actions was submitted to the PHS/EHD for comments and authorization A copy of the correspondence is also provided in Appendix F 7-0 SOIL SPREADING ' On behalf of the 650 Management Corporation, SRK requested and wasermission ranted f g p from the PHS/EHD to dispose of non-contaminated soil generated during SRK's soil boring/monitoring well installation (November 1991) A copy of the written request is provided in Appendix G PHS/EHD granted verbal authorization on February 4, 1993 A total of 14 drums of soil were spread on-site near the west property line (see Figure 1) The empty drums, including one drum containing 3:sa•: •atrr Steffen Robertson and Kirsten