CO0047142 - Laserfiche WebLink

Home Browse Search

SummerHill Apartment Communities 10391.000.000 Rollins Road-Carolan Avenue, Burlingame November 19, 2014, Revised January 14, 2015 Once the buildings have been demolished and the debris removed from the Site, the soil beneath the buildings in the area of the planned underground parking structure will be characterized for removal to the appropriate landfill. The findings from this study will be used to begin to quantify the soil for the various disposal options prior to beginning the excavation. For the purposes of this SMP, the following sampling methodology will be implemented for the planned excavation area: It is anticipated that a total of 22 Geoprobes will be advanced in a grid pattern across the footprint of the planned excavation area.( Figure 5) Samples will be recovered at the surface and at approximate 3-foot intervals to the planned base of the excavation ( 8 - 10 feet). It is anticipated that a total of 80 samples will be recovered from the borings for laboratory testing. Soil samples will be retrieved within continuous Geoprobe® acetate core liners measuring 4 or 5 feet in length. Continuous soil cores from each boring will be logged by an ENGEO geologist or engineer. Specific soil samples will be collected for laboratory analysis by cutting a 6-inch portion of the Geoprobe soil core liners corresponding to the respective desired sampling depths in each location. The samples will be collected from various depths of the sampled soil profile, and target analytes will be selected based on potential presence with respect to soil depth. The sample sleeves will be sealed using Teflon® sheets secured by tight-fitting plastic end caps. Upon collection of samples, a sample label will be placed on the sample and will include a unique sample number, sample location, time/date collected, laboratory analysis, and the sampler's identification. For volatile organic analyses (TPH-gasoline, BTEX) samples will be recovered using 25-gram Encore samplers (EPA 5035). The soil samples will be placed in an ice- cooled chest and will be submitted under documented chain-of-custody to a State-accredited fixed-base analytical laboratory. For the purpose of landfill profiling, the upper samples will be prepared as either 3- or 4- point composite samples that will be analyzed for the following target analytes: • Total petroleum hydrocarbons (TPH) as gasoline (EPA Method 8260) • Volatile organic compounds (VOCs) (EPA Method 8260) • TPH as diesel and motor oil w/silica gel cleanup (EPA Method 8015M) • CAM 17 Metals • SVOCs (SIM) The base samples (garage floor elevation) will be analyzed as discrete samples for the following analytes: • Total petroleum hydrocarbons (TPH) as gasoline (EPA Method 8260) • Volatile organic compounds (VOCs) (EPA Method 8260/8035) • TPH as diesel and motor oil(EPA Method 8015M) • CAM 17 Metals • SVOCs (SIM) -6- ENGEO Expect Excellence—