COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

13 November 2018 AGE Project No. 18-4357 Page 2 of 11 AdvancedGeo Environmental n Environmental Screening Level for commercial and residential properties. Analytical results of soil samples and screening level values are summarized in Table 1. Based on the results of the soil sample analyzed, the SJCEHD prepared a Waste Discharge/Spill Response Notice to Abate letter dated 20 March 2018 (Appendix B). The letter directs investigation and abatement of the remaining contamination. 3.0. CLEAN UP GOALS The Cleanup goals listed below were proposed in the Work Plan and approved by SJCEHD by email dated 26 July 2018. The cleanup goals were selected to protect human health and the environment. Site usage has recently changed from industrial to commercial. There are no plans for the site to ever be used for residential purposes. Clean up goals were selected utilizing currently established environmental screening levels. • Total petroleum hydrocarbons quantified as motor oil range compounds (TPH-mo) will be evaluated using the established San Francisco Bay RWQCB Environmental Screening Level (ESL) of 140,000 milligrams per kilogram (mg/kg) for commercial properties. There is no hazardous waste criteria or level directly established for TPH-mo. • Metals and additional analytes will be evaluated using the established DTSC-SLs and RSLs for commercial and industrial properties; DTSC-SLs and RSLs for metals are listed in Table 1. The commercial DTSC-SL for total lead is 320 mg/kg, this value will represent the cleanup goal for total lead. However, the hazardous waste criteria for total lead is 1,000 mg/kg, and the hazardous waste criteria for soluble (STLC) lead is 5 milligrams per liter (mg/1). Therefore, the clean-up goal for soluble lead will be established at 5 mg/I. Therefore, any soil with a value over the cleanup goal for STLC lead will require removal and disposal at a Class I landfill. 4.0. SOIL EXCAVATION, REMEDIATION AND SAMPLING On 14 August 2018, AGE performed soil excavation/potholing and collected soil samples in the general areas proposed in the Work Plan (Main Excavation Area, S6 Excavation Area, and S5 through S11). Soil excavation was performed by Valued Engineering utilizing a backhoe. On 31 August 2018, AGE advanced one additional soil boring (S12) at the site using a 4 -inch diameter hand auger to collect soil samples and define the lateral extent of impacted soil. The additional sample (S12) was advanced with the approval of the SJCEHD.