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' Response to Comments on final Please III Technical Memorandum <br /> PG&E Stockton Former Manufactured Gas Plant Site <br /> ' May 4, 1995 <br /> Page 1 <br /> Enclosed are responses to comments on the final Phase III Technical Memorandum, <br /> Stockton former MGP site from DTSC (letter to Robert Doss/PG&E, dated April 12, <br /> ' 1995) and from RWQCB (letter to Fernando Amador/DTSC, dated April 6, 1995). <br /> Responses are numbered according to the numbered comments in these letters. <br /> ' Responses to DTSC's April 12, 1995 letter: <br /> 1. The extent of PNAs in groundwater was evaluated on the downgradient side of the <br /> site, based upon the groundwater direction determined by historic water level <br /> measurements. Conclusions were not made as to the upgradient and cross-gradient <br /> (western and northern) extent of constituents in groundwater. The results of the <br /> ' upcoming monthly water level measurements, quarterly sampling, and Phase IV <br /> groundwater investigation will help confirm the groundwater gradient as well as extent of <br /> ' constituents in groundwater Zones A, B, and C. <br /> 2. In PG&E's telephone conversation with DTSC on April 24, 1995, PG&E offered to <br /> sample wells MW-4 and MW-5 on a quarterly basis even though it had been decided in <br /> the February 28,1995 meeting that these wells would be monitored on a semi-annual <br /> ' basis. Wells MW-4 and MW-5 were sampled in March in 1995 and they will continue to <br /> be monitored on a quarterly basis at this time. <br /> ' 3. PG&E is in the process of obtaining and evaluating additional data from the nearby <br /> ' City of Stockton Fire Department site and the former Morton Paint site. The evaluation <br /> of this information will be used during planning of the Phase IV groundwater <br /> investigation. This information will be included in the Phase IV work plan. <br /> 4. During PG&E's telephone conversation with DTSC on April 24, 1995 and during the <br /> ' February 28, 1995 meeting, PG&E offered to monitor water levels on a monthly basis for <br /> six months, which PG&E is now doing. The water level gradient will be evaluated in all <br /> three Zones and will be used when devloping a work plan for further groundwater <br /> ' investigation (Phase M. We recognize that if the groundwater gradient, as measured <br /> over the next six months, is different that the gradient historically measured, some of the <br /> conclusions in the Phase III Technical Memorandum may need to be revised. <br /> t <br /> 1 <br />