Attachment_D-_Olympic_Monitoring_Well_Program_Summary.pdf

Olympic Well Field Quarterly Groundwater Monitoring Program – Summary Sheet

1. Traffic control should be arranged to allow access to wells for gauging and sampling purposes. Traffic control protocols should comprise the following:

• Obtain City of Santa Monica Street-Use Permit

• ‘No Parking' postings for 10 well locations (OB-2, OB-3, OB-5, OB-7, OB-8, OB-10, OB-11, OB-

12, OB-14, and OB-17)

• Use of a Traffic Controller to divert traffic whilst two well locations (OB-17 and OB-8) located near traffic lanes are gauged and sampled.

2. Gauging groundwater levels at the following 30 groundwater monitoring wells (Figure 1):

Property Name Well IDs

Bergamot KMW-12, MW-10

Kite Pharma OB-1

MTA Right-of-Way GW-30-5, GW-30-6

City Rights-of-Way

MW-11, OB-2, OB-3, OB-4, OB-5, OB-6C, OB-6D, OB-7, OB-

8, OB-9B, OB-9C, OB-10B, OB-10C, OB-11B, OB-11C, OB-

12B, OB-12C, OB-13C, OB-14B, OB-14C, OB-15B, OB-15C,

OB-16B, OB-17B and OB-17C

3. Collection of groundwater samples using low-flow sampling methods from the following 25 groundwater monitoring wells (Figure 1):

OB-1 OB-10C OB-15C

OB-2 OB-11B OB-16B

OB-3 OB-11C OB-17B

OB-4 OB-12B OB-17C

OB-5 OB-12C MW-11

OB-6D OB-13C MW-10

OB-7 OB-14B KMW-12

OB-8 OB-14C

OB-10B OB-15B

4. The following quality assurance (QA) / quality control (QC) samples should also be collected during each quarterly monitoring event:

• 2 x Field Duplicates

• 1 x Equipment Rinsate Blank (for non-dedicated equipment)

• 4 x Trip Blanks (one per day of sampling)

5. Groundwater samples should be analyzed by a State of California-certified analytical laboratory for the analytical schedule provided in the following table:

Sample Type No. Samples per Quarter Analysis

Primary Sample 26

• Volatile Organics & Fuel Oxygenates (EPA

Method 8260B)

• Low Level 1,4-Dioxane (EPA Method 522)

• Low Level 1,2,3-TCP (SRL 524M-TCP)

QC Sample - Field

Duplicate

QC Sample - Equipment

Blank

QC Sample - Trip Blank 4

• Volatile Organics & Fuel Oxygenates (EPA

Method 8260B)

6. Purged groundwater (and other liquid waste generated from decontamination) generated during each quarterly sampling event should be stored in a Department of Transportation-approved 55-gallon drum and disposed by a licensed waste transporter to an appropriate storage and disposal facility. Recent sampling of

Olympic Well Field groundwater monitoring wells indicated that per- and polyfluoroalkyl substances

(PFAS) are present at very low concentrations and below applicable notification levels in the groundwater samples collected. For this reason, the wastewater generated during sampling of the Olympic Well Field groundwater wells are designated “Non-Hazardous and contains PFAS”, which requires additional disposal considerations.

7. Upon completion of the above listed tasks, an evaluation of current site conditions should be conducted including interpretation of groundwater flow conditions in different hydrostratigraphic zones, review of groundwater analytical results, and an overview of remediation activities as they relate to plume control for the Olympic Well Field. A draft quarterly monitoring report documenting the activities, monitoring results and date evaluations should be prepared and submitted to the City for review and comment no later than two weeks prior to the report’s final due date. Following receipt of comments from the City, a final report should be submitted to the Regional Water Quality Control Board (RWQCB) and uploaded to the State

Water Board’s GeoTracker database (Global ID: T0603799303) by the report due date at the end of the month following the calendar quarter in which the wells were sampled (i.e., the end of April, July, October, and January).