SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

{ page 3 , 2085 Fremont Street In summary, the work plan as submitted is not approved . A detailed , clear and concise work plan must be submitted that includes the following points: 1 . Investigation of the vertical extent of the dissolved contamination, both in the source area and across the site; which is necessary to set the target depths and zones for the lateral investigation . SJC/EHD recommends the use of CPT technology to obtain deep subsurface lithological information to find the deeper water bearing units. If you choose to complete the vertical investigation by hollow stem auger, the borings must be continuously cored starting at 70 feet bsg to total depth, to look for water bearing zones in which to set the discrete monitoring well screen intervals. 2 . Installation of deep, discretely screened groundwater monitoring wells for investigation of the vertical extent of the dissolved contamination. The targeted depths of the screen intervals can be determined from the results of the CPT investigation or continuous hollow stem auger cores . Screen intervals must be no longer than five feet. One well must be located near the source area and must be screened deeper than 100 feet bsg . 3. Installation of sufficient number of groundwater monitoring wells for lateral definition of the shallow dissolved contaminant plume. These wells will be built to intercept first groundwater, which is currently at approximately 51 feet bsg ; the screen intervals of these wells must be no longer than 20 feet. SJC/EHD does not approve the proposed well location noted on Figure 3 for the east side of Laurel Street. It is too close to MW-2. SJC/EHD recommends a well be located on the west side of Laurel Street instead . 4. A map with the locations of all proposed borings and wells clearly marked : 5 . A site specific Health and Safety Plan . The disapproved Work Plan was submitted two and one half months late. The new work plan is due for submittal no later than April 23, 2004 . As you have been repeatedly out of compliance with regulatory deadlines , failure to submit this work plan on time will result in referral of this site to the Regional Water Quality Control Board , Central Valley Region, or the San Joaquin County District Attorney's Office for enforcement action. As this is the second phase of groundwater assessment at this site, and involves deeper wells , and of necessity starts setting up monitoring of the three dimensional hydrogeological framework, the work plan must be stamped and signed by a California registered geologist or professional engineer. If you have any questions or comments please call Lori Duncan at (209) 468-0337. Donna Heran , REHS, Director Environmental Health Department Lori Duncan , Senior REHS Nuel C. Henderson, Jr. , R LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV cc: James Barton , CVRWQCB Bill Fox, WHF