COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

31 August 2016 AGE Project No. 96-0235 Page 7 of 8 will be containerized in properly labeled DOT-approved 55-gallon drums or a 10-yard soil bin and stored in an area on the site generally lacking public access. Disposal alternatives for rinseate and stockpiled soil will be selected based on results of a laboratory analysis. Soil samples for data collection and soil evaluation will be collected through the hollow stem of the augers. Relatively undisturbed soil samples will be collected using a California split-spoon sampler loaded with three 2-inch by 6-inch steel or brass sleeves. The sampler will be driven by dropping a 140-pound hammer from a height of 30 inches. The sampler will be driven 18-inches or until refusal into the undisturbed soil below the bit on the lead auger. Upon removal from the sampler, the sample sleeves will be separated. Based on the amount of sample recovery, a selected sample sleeve will be preserved for possible laboratory analysis. Subsequently, the exposed ends of the sleeve will be covered with Teflon sheets, plastic end caps and sealed with tape. Following sample collection, each preserved sample sleeve will be labeled with the boring location, depth, time, date and sampler's initials. Appropriately sealed and labeled samples will be placed in a chilled container under ice and will be transported under chain of custody procedure to a certified laboratory. During drilling, soil samples will be collected at five-foot intervals (beginning at 35 feet bsg) for logging purposes; selected soil samples will be analyzed by a CDPH-certified laboratory for the constituents listed in Section 3.3. Laboratory reports for soil analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. Soil encountered in the borings will be visually classified by an AGE geologist or environmental scientist in accordance with the USCS. Additionally, soil samples will be field-screened for the presence of volatile organic compounds using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID). 4.3. WELL COMPLETION AND ELEVATION SURVEY The pilot soil boring will be completed as a groundwater monitoring well utilizing a 2-inch diameter, Schedule 40 PVC blank well casing and 0.020-inch slotted well screen installed from 75 feet to 85 feet bsg. A diagram of the proposed monitoring well construction is depicted in Figure 4. After installing the well casing in the pilot boring, a filter pack material consisting of pre- washed #3 Lonestar sand will be added through the augers from total depth to approximately 2 feet above the screened interval. Following placement of the filter pack, the well will be surged to assist in settling the filter pack. Additional sand will be added if settling occurs. A three-foot bentonite seal will be placed above the filter pack to minimize the potential for grout penetration into the screened section of the wells. The bentonite seal will be ,4dvanced GeoEnvironmental Int.