WORK PLANS - Laserfiche WebLink

Home Browse Search

3.0 Scope of Work The scope of work is discussed in this section. Table 1 provides analytical methods and estimates of number of samples to be analyzed. Figure 1 provides estimated locations for UVIF- CPT work, DP sampling and air -sparge testing. UVIF-CPT and DP work are proposed for both the property (515 West Charter Way) and for a portion of Lincoln Street, which is owned by the City of Stockton. Preparatory activities will include obtaining soil boring permits, well permits if needed, an Encroachment Permit, notification of Dig -Safe (formerly Underground Services Alert), and other activities. 3.1 UVIF-CPT Shaw proposes the use of Ultra -Violet Induced Fluorimetry Cone Penetration Testing (UVIF- CPT) as follows: • Perform Ultra -Violet Induced Fluorimetry Cone Penetration Testing (UVIF-CPT) at 9 to 15 locations to rapidly log both qualitative hydrocarbon content and soil type. The exact number and locations of UVIF-CPTs will be determined in the field based upon logistics and upon TPH indications found in the preceding UVIF-CPTs. • CPT is expected to be made to depths of at least 80 and possibly as great as 100 feet below grade. Logs from the installation of site well MW-4RD indicate some hydrocarbon was encountered as deep as 80 feet during drilling of that well. • UVIF-CPT will provide objectively -derived evaluation of hydrocarbon impact and soil type at depth intervals of approximately every 5 cm to the total depth of exploration. • The UVIF is expected to accurately determine the primary depth of any significant mass(es) of residual gasoline hydrocarbons. When used at multiple locations it will also aid in determining the lateral extent of that hydrocarbon. • UVIF indications of hydrocarbon do reliably ^indicate concentrations. This is due to variations in soil type, variations in fluorimetry due to hydrocarbon type and occurrence (TPH makeup, dissolved vs. sorbed vs. free -phase, etc.) and other factors. Because of this, UVIF indications will be evaluated by collection and laboratory analysis of soil and groundwater samples using USEPA and DOHS -promulgated methods (discussed below). • To make pore -pressure dissipation tests. These provide quick, small-scale estimates of hydraulic conductivity. They are made downhole using UVIF-CPT equipment. • The CPT component of UVIF-CPT will provide objective interpretation of soil type based on widely -used algorithms that interpret CPT -derived skin friction and tip UserName orDepartment-Z.tsacDR20051Pffi88018800391A.5ad.doc 3-1