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California Regional Water Quality C6ntrol Board <br /> V Central Valley Region M, <br /> Steven T.Butler,Chair <br /> .Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 22 August 2000 <br /> 61 d S < <br /> Ms. Margaret Russell <br /> c/o Mr. John Welch <br /> P.O. Box 690757 <br /> Stockton, CA 95269 <br /> ADDITIONAL INVESTIGATION REPORT, FORMER KARLSON TRUCKING, <br /> MANTECA, SAN JOAQUIN COUNTY <br /> I have reviewed the 27 April 2000 Geo-Phase Environmental's (GPE)Site Characterization Report- <br /> Second Event for the former Karlson Trucking site in Manteca. The report presents the results of <br /> additional soil and groundwater sampling conducted at the site. The purpose of the investigation was to <br /> define the lateral and vertical extent of soil and groundwater pollution. <br /> My comments on the report are presented below. <br /> 1. Several boring logs have descriptions which are inconsistent with the Unified Soil Classification <br /> System(USCS) designations. If the report used a soil classification system other than USCS to <br /> describe soil characteristics, then the report should explain the apparent inconsistency between the <br /> descriptions and USCS designations. <br /> 2. The report states that the Board has adopted a general cleanup goal of 100 µg/1 for total petroleum <br /> hydrocarbons as diesel (TPHd) and the pollutant being detected exhibits a hydrocarbon distribution <br /> which is typical of TPHd and dielectric oil. The report requests the remediation goal for the site be <br /> reconsidered due to the absence of benzene, toluene, ethylbenzene, xylenes (collectively BTEX) and <br /> polynuclear aromatic hydrocarbons (PAHs), which are chemicals generally used as indicators of poor <br /> groundwater quality. <br /> Attachment 1 provides the water quality objectives (WQOs) for constituents of petroleum-based <br /> fuels to protect the beneficial uses of groundwater beneath the site. Exceedance of any of those limits <br /> means the beneficial use of the groundwater has been impaired. However, the site does not have to <br /> meet the WQOs to be granted no further action (NFA). Staff may grant an NFA if the site meets all <br /> the criteria for low risk groundwater as specified in Appendix B of the Tri-Regional Board Staff <br /> Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites and the <br /> remediation time of monitored natural attenuation is comparable with that of active remediation. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />