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i <br /> MAY, -07' 99 (FRI) 08:56 UNOCAL "~;T NORTH RE TEL:510 3781 P. 004 <br /> I <br /> ONOCIIL <br /> Page 3 <br /> When reviewing the groundwater analytical results for general minerals in Table a, different <br /> conclusions can be drawn. The level of some minerals may sucggest that water from MW2 acid <br /> NP1 is different from the water from MWI0 (hardness and zinc), whereas the level of other <br /> miMeralvc may suggest that water from MW1C and NVI is different from the water from MW2 <br /> (magnesium and sodium). <br /> PHSIEHD does not agree that the information provided supports statements that the general <br /> water quality in the vicInity of the site is poor or that the grater from NPI reproaents salt watcr front <br /> intrusion and is clearly of different quality than the water from MV42 and MW10. In addition, the <br /> information cannot be used to justify leaving petroleum hydrocarbon cantnminatfon in the <br /> groundwater. <br /> utscussions about the biogeochernical data indicating the groundwater plume is undergoing <br /> microbial biodegradation can also be disputed. The highest dissolved oxygen measurement was <br /> in NP1 where contaminant concentrations are greaterthan in off site wells. Nitrate and sulfate <br /> levels in the waiter from MW9 are higher than In the wafter from MW1 (both wells are cross <br /> 91udient and have only evidenced low levels of contaminants in the water obtained km them). <br /> Quarterly sampling of Use monitoring wells must continue. In addition, a work pian to define the <br /> lateral and vertical extent of off site, downgradient soil and groundwater contamination and install <br /> welle on situ for feasibility tests should,Uu submitted by July 1, 199U. <br /> Please be advised that pursuant to Section 25297.15 of the Health and Safety Code, PHSIEHD <br /> has identified UNOCAL as the primary or active responsible party for this site. It is the <br /> responsibility of the primary or active responsible party to submit a letter to PHSIEHD which <br /> identifies all current record owners of fee dtle and to certify to PHSIEHD that required notifications <br /> have been made at the time a cleanup or site closure proposal is modo or bafare a determinaliw <br /> that no further action is required is made. <br /> If you have any questions contact me at(209)468-3449. <br /> Donna Heran, REHS, Direr <br /> Environmental Health Division <br /> Margaret Lagorio, Supervising REHS <br /> Site MfUgation Unit <br /> o: CVRWQC8-Mark Ust <br /> ARCADIS Geraghty 8 Miller-Dr. Stephen Cullen <br /> SJCADA-David Irev <br /> Helen McCrary <br /> Brooke Sirleie, Esq. <br /> Peter Niemiec, Esq, <br />