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0 &ine-Fricke-Recon <br /> ENGINEERS.HYDROGEOLOGISTS a APPLIED SCIEWSTS <br /> SECOND QUARTER 1997 MONITORING REPORT (29 AUGUST 1997) <br /> 1. The quarterly reports are to include isoconcentration maps for PCE and total "Hazardous Substances" (the five VOCs <br /> identified in the Consent Decree). Separate maps are to be prepared for each individual water bearing zone. <br /> We acknowledge the RWQCB's request and will provide additional maps in future quarterly <br /> monitoring reports, beginning with the fourth quarter 1997 quarterly groundwater monitoring <br /> report. <br /> 2. The analytical results of all detected VOCs,not just the five"Hazardous Substances,"are to be presented in the data <br /> tables.The fourth quarter 1997 monitoring report(due by 15 February 1998)is to contain an updated data summary <br /> table containing all detected VOCs. <br /> We acknowledge the RWQCB's request to tabulate all detected VOCs and will provide the <br /> additional tables in future quarterly monitoring reports, beginning with the fourth quarter 1997 <br /> quarterly groundwater monitoring report. <br /> 3. Municipal well COS-11 is to be added to the monitoring well network and sampled on a semi-annual basis by EPA <br /> method 8260A beginning with the first quarter 1998. <br /> We acknowledge the RWQCB's request and will sample COS #11 on a semiannual basis <br /> beginning in the first quarter of 1998. We recommend that groundwater samples collected from <br /> COS #11 be analyzed for VOCs using EPA Method 8260A (modified) to be consistent with our <br /> previous sampling event in February 1997. The Quarterly Monitoring Plan for the project will be <br /> revised to reflect this modification and will be submitted to the RWQCB for approval. <br /> 4. If desired, monthly water level measurements may be discontinued and replaced with quarterly measurements. <br /> We appreciate and agree with the RWQCB's recommendation and will discontinue monthly water- <br /> level measurements beginning in January 1998. Quarterly water-level measurements will continue <br /> to be collected before collecting quarterly groundwater samples. The Quarterly Monitoring Plan <br /> for the project will be revised to reflect this modification and will be submitted to the RWQCB for <br /> approval. <br /> SURFACE EMISSION ISOLATION FLUX CHAMBER INVESTIGATION SAMPLING PLAN <br /> (13 OCTOBER 1997) <br /> 1. This workplan is to collect data to be used for the health risk assessment(HRA). I informed Levine-Fricke-Recon(LFR) <br /> in early October that Board staff does not review HRAs,and therefore, staff cannot review or approve the flux chamber <br /> proposal. <br /> We acknowledge the RWQCB's position with respect to approving health risk assessment (HRA) <br /> documents. At Ms. Wendy Wyel's suggestion, we contacted Dr. Steve Dizio at the Department of <br /> Toxic Substances Control (DTSC) regarding the proposed flux chamber sampling procedures. Dr. <br /> Ltr-Resp-R W QCB-Dec97-0411 BSRL 4 <br />