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WORK PLANS_CASE 2
Environmental Health - Public
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WORK PLANS_CASE 2
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Last modified
6/11/2020 12:02:19 PM
Creation date
6/11/2020 11:59:47 AM
Metadata
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Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
WORK PLANS
FileName_PostFix
CASE 2
RECORD_ID
PR0540424
PE
2960
FACILITY_ID
FA0023098
FACILITY_NAME
RMC PACIFIC MATERIALS - T0607700371
STREET_NUMBER
30350
Direction
S
STREET_NAME
TRACY
City
TRACY
Zip
95377
CURRENT_STATUS
01
SITE_LOCATION
30350 S TRACY
QC Status
Approved
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EHD - Public
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INTRODUCTION <br /> RMC Pacific Materials maintains an aggregate mining operation at 30350 South Tracy <br /> Boulevard in Tracy, California. In compliance with regional water board requirements, three <br /> underground storage tanks (UST) containing petroleum products were removed from the site <br /> during the late 1990's. Ground contamination was encountered in each case and it is for that <br /> purpose this work plan is being developed. <br /> INTENT OF PROPOSED WORK <br /> RMC proposes to delineate both the vertical and horizontal extent of petroleum- <br /> contaminated soil in the area of the three former USTs on the RMC aggregate property. The goal <br /> of the investigation is to satisfy the requirements of San Joaquin County by defining the extent of <br /> the contaminated soils and to demonstrate that the groundwater has not been impacted by the <br /> contamination. RMC does not anticipate that the contamination has reached to the water table <br /> because data from other investigation wells on the property have consistently shown that the <br /> water table is one hundred feet below surface grade (bsg). <br /> PROPOSED SCOPE OF WORK <br /> Drilling Project <br /> RMC Pacific Materials will hire a State licensed drilling contractor to undertake up to <br /> six, dual-wall, air percussion hammer soil borings down to the groundwater depth in and around <br /> the area of the former UST's. This type of rig has been found to be best suited for the gravel and <br /> cobble rich soil found in this area. The approximate locations for the borings are shown on <br /> Figure 1. The depth of each boring is expected to be approximately one hundred feet below <br /> surface grade but this will be determined at the time of the drillings based on the depth of first <br /> water encountered. <br /> Return cuttings will be continuously logged using the USC system of soil classification and <br /> monitored for contamination as the borings progress. A field technician under the supervision of <br /> a state registered geologist will do all logging work. If no discernable petroleum odors are <br /> encountered in the cuttings a soil sample will be taken every twenty feet until encountering first <br /> water. If a petroleum odor is encountered soil samples will be taken every five feet until either <br /> the odor is no longer detected or first water is reached. <br /> Upon reaching the water table in each boring the water table will be allowed a period of at <br /> least one hour to recover pressure equilibrium. After that recovery period measurements will be <br /> taken with an electronic water tape to measure the depth to the water level. A water sample will <br /> then be taken from the boring with a clean bailer, down through the center drill tubing, to <br /> observe and measure any presence of floating petroleum product thickness. If it is determined <br /> that petroleum contamination is present on or in the bailer, or if it appears to exist in the soil or <br /> near the ground water level, the boring depth will be extended a full twenty feet beyond the <br /> 3 <br />
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