ARCHIVED REPORTS_XR0006951 - Laserfiche WebLink

Home Browse Search

Supplemental Investigation Report,Problem Assessment Report and Work Plan Cleanup-and Abatement Order No 5-00-707 EAI Pro ect No 1232 The samples will be sealed in 40-milliliter volatile organic analysis (VOA) vials with Teflon septa lined lids Each VOA vial will be completely filled so that no headspace exists between the sample and the lid 513 Equipment-Cleaning Protocol The augers used to drill the borings will be steam cleaned between each boring The drive g g sampler will be disassembled and decontaminated prior to each sampling using the following procedure • All excess soil will be scraped off the sampler parts • The sampler will be washed in a solution of Alconox detergent and tap water • The sampler will be double rinsed with distilled water The down-hole pump (equipment) used only to develop and purge the wells will be decontaminated between each event as follows • The equipment will be flushed with tap water • The equipment will be flushed with a solution of Alconox detergent and tap water • The equipment will be flushed with tap water 5.2 Robinhood Irrigatioin Well In order to attempt to determine the extent of impact, both vertically and laterally, around the RIW, three 150-foot deep Cone Penetrometer Test (CPT) borings will be advanced as approximately shown on Figure 20 The work will be completed using a 25-ton CPT ng and accompanying support equipment The dead weight of the CPT rig will be used as a reaction to push the cone penetrameter using a hydraulic ram located at the center of the rig Soil parameters such as cone bearing, sleeve friction, friction ratio and pore water pressure will be measured as the cone penetrameter is advanced These measurements will be sent uphole through the cone rods to an on-board data acquisition system All data will be processed in real time in the field CPT plots of tip resistance, sleeve friction and pore pressure will be provided in the field along with a table of interpreted soil parameters Data obtained from these three CPT borings will be reviewed and evaluated by on-site EAI and RWQCB staff to determine at what depths discrete soil and ground water samples should be collected from each boring for analytical testing Once the discrete sampling depths have been determined for each boring, three new CPT borings, each within approximately five feet of the original boring, will be advanced Discrete soil samples will be collected using a piston-type sampler pushed with the CPT rig, and discrete ground water samples will be collected using a hydropunch It is anticipated that at least three discrete soil samples and three discrete ground water samples will be collected from each of the final three CPT borings The exact number of samples to be tested will be determined in the field in consort with RWQCB staff BS 1232P ERW_WP -15- ENvrR0NMENTAL AUDIT,INC