ARCHIVED REPORTS XR0001666 - Laserfiche WebLink

Home Browse Search

Graunclwat er Monitaring for Biological Activit To sufficiently monitor biological activity and migration, representative wells should be sampled on a regular basis The draft RMRP (RMRP Table 2) requires monitoring MW-12, MW-14 and EW-1 on a twice-monthly basis for dissolved oxygen, pH, EC, bacterial composition and numbers and monitoring on a monthly basis for TPH as gasoline and BTE&X The RMRP also requires monitoring MW-6 through MW-11 and MW-13 on a monthly basis for dissolved oxygen, pH, EC, bacterial composition and numbers GeoAudit recommends monitoring of wells MW-6, MW-10, MW-7, MW-11 and MW-13 on a monthly bans for dissolved oxygen, pH, EC, bacterial composition and bacterial numbers, wells EW-1 and MW-14 should be monitored on a twice-monthly bans for the same parameters as well as monthly for TPH as gasoline and BTE&X We believe that the wells chosen will satisfy the concerns of the CVRWQCB and provide sufficient data to monitor the bioremediation progress Monitoring well MW-6 will provide an up-gradient well, MW-10 will provide a cross-gradient well, MW-7 and MW-11 provide down-gradient wells near the edges of the hydrocarbon plume (contaminated zone), MW-13 provides a down-gradient well beyond the extent of the plume, and EW-1 and MW-14 provide wells within the hydrocarbon plume Monitoring wells MW-8 and MW-9 were deleted because both are within the current hydrocarbon plume, we believe EW-1 and MW-14 will provide representative data for wells within the plume Wells MW-8 and MW-9 will continue to be sampled on a quarterly basis to monitor hydrocarbons, which will provide indications of biological activity in the areas of these wells These wells should provide data to meet all the concerns of the CVRWQCB On page two of the October 12, 1994 letter, MW-12 is characterized as being contaminated However, during the past four years, Hydrocarbons have only been detected (at low concentrations) twice in MW-12, MW-12 has been non-detect for the past two quarters This indicates that the hydrocarbons detected in MW-12 during the March, 1994 sampling were not representative of the well Therefore, we do not agree with the statement that MW-12 is contaminated Based upon this, we do not belie-*a it is necessary to monitor two down- gradient wells for biological activity Soil Gas/Vapor-Monitoring Similar to the groundwater monitonng, we would like to reduce the number of wells to be monitored to avoid redundant or useless data, as well as save costs to GLDM GeoAudit suggests modifications to the sampling frequency and the sample locations for the soil gas/vapor monitoring The parameters to be measured are agreeable to GeoAudit We suggest monitoring all inoculated wells on a twice-monthly basis during "start-up" GwbgxaIA dpi Sc RrvKrs inc MRP 111h)Wt 97 2