SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

E ` i ARCO Meeting Minutes i Augusta, 1994 1 Page 4 f � ARCO 2076, LodiMa { ry Meays} Mary said that she had received the first quarter status report and brought to ; total xylenes was detected in MW-3 during the fourth quarter o 9 our attention that reported concentration was 0.7 ppb which is below MCLS and contamina onOcou stated a ehat the easily occurred in the laboratory(dirty glassware, cross contamination, etc.). In addition, this was the only sampling event in over a year which resulted in the detection of hydrocarbons in groundwater. Laboratory results on quarter of 1994 confirm that hydrocarbongroundwater aretnot pesent inothe gr during the first and second groundwater. � Mary asked when ARCO would be scheduling remediate on ofthat a select number of abatement units have been allocated for San impacted soil. ARCO stated ARCO intends to focus remediation efforts on those sites which have the h' i contamination or pose the greatest risk to groundwaterthosesit gain County, and that the site to begin after six months. ARCO explained to Mary that the highest amount of and therefore anticipate remediation of the availability and performance of remediation systems operating in he ounce as dependent on + ARCO 548, Stockton, (Mary Meays) r. s � Mary said that she had received the quarterly status report(PAR and that the PAR was d in areas outlined in her correspondence to ARCO and requested additional info , sections, remedial alternatives, deficient t VET results, information {cross at the meeting presenting this additional information. EMCON explsubmita ined ned to Mary that basan addendum to e PAR ed on d conversations with her, an abbreviated PAR would be excepted since only aim data amount of } data had been collected since submitting the Preliminary Investigation and Evaluation Report. s Mary said that this was now not the case and complete PAR was required. E that the addendum that was submitted that date should satisfy all PAR requirements told Mary i Mary said that based on the first quarter status report, it appears that dissolved hydrocarbon concentrations have increased and extend off-site ARCO stated that he results of the first quarter sampling event may not accurately present the groundwater quality. ARCO explained to Mary that ARCO begin using a new groundwater sampling contractor the beginning of 1994 and data collected from some sites are likely incorrect. EMCON informed Mary that the results of consistent with previous quarters and that hydrocarbons do not exsecond quarter sampling event show that the concentrations are btend offsite.ack to levels that are she will review that data once she has received the report. Mary said that Mary asked ARCO if the source has been eliminated and implied that there is an ongoing leak t y from the tanks. ARCO replied by saying that the tanks and lines have been tested and are within t the allotted parameters. Mary questioned the general validity of tank testing stating that the tests t are not accurate and is sure that leakage is occurring. Diane Hinson redirected the discussion stating that the dialogue was based on conjecture. Mary asked ARCO what implemented. EMCON sated that eme Of ration efforts were ediation by soil vapor extranned ction app they would be F effective remedial alternative. Mary asked how groundwater was going to be remediated. _ EMCON said that the majority of dissolved appears to be the most i and within the effective radius of influence of the vans are located in the vicinity of the USTs remediation of groundwater was not going to be ignored and will monitor the effects aid that 3 extraction system has on the groundwater. sparging, etc.) will not be implemented at this time but the need wilive groundwater l be ev�aluatted(Pump treat, air r operation of the vapor extraction system and be discussed in future quarterly status reports. f 9 s f f